JOURNAL OF QUATERNARY SCIENCE (2004) 19(3) 271–280 Copyright ß 2004 John Wiley & Sons, Ltd. Published online 24 February 2004 in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/jqs.805 Late-glacial and Holocene river development in the Teleorman Valley on the southern Romanian Plain A. J. HOWARD,1* M. G. MACKLIN,2 D. W. BAILEY,3 S. MILLS3 and R. ANDREESCU4 1 School of Geography, Politics and Sociology, The University of Newcastle, Newcastle upon Tyne, NE1 7RU, England 2 Institute of Geography and Earth Sciences, University of Wales Aberystwyth, Ceredigion, SY23 3DB, Wales 3 School of History and Archaeology, Cardiff University, PO Box 909, Cardiff CF10 3XU, Wales 4 Muzeul Naţional de Istorie a României, calea Victoriei nr. 12, Sector 3, Bucureşti, Romania Howard, A. J., Macklin, M. G., Bailey, D. W., Mills, S. and Andreescu, R. 2004. Late-glacial and Holocene river development in the Teleorman Valley on the southern Romanian Plain. J. Quaternary Sci., Vol. 19 pp. 271–280. ISSN 0267-8179. Received 21 January 2003; Revised 24 September 2003; Accepted 29 September 2003 ABSTRACT: This paper reports on a radiocarbon-dated sequence of alluvial terraces from the Teleorman Valley in the southern Romanian Plain and represents the first Late-glacial and wellconstrained Holocene alluvial sequence from the lower Danube Valley of southeast Europe. The two earliest and most extensive terraces (T1 and T2) are dissected by large, high-amplitude palaeochannels, which are dated to ca. 12 800 yr BP and are comparable to large meandering palaeochannels identified from other Late glacial contexts across northern and central Europe. The remaining sequence of alluvial deposits show changes in river activity and accelerated sedimentation around 4900–4800 yr BP, 4000–3800 yr BP, 3300–2800 yr BP, 1000 yr BP and within the past 200 yr. A phase of tributary stream alluvial fan deposition is dated to ca. 2400 yr BP. All these periods of alluvial sedimentation correlate well with episodes of climatic cooling, higher rainfall and enhanced river activity, both in terms of incision and greater lateral mobility as well as increased flood frequency and magnitude identified elsewhere in central, western and northern Europe. Human activity appears to have had little effect on this river environment and significant fine-grained sedimentation is not noted until ca. 2400 yr BP, approximately 5000 yr after the first neolithic farmers settled the area. Whether this record of river activity truly reflects the impact of prehistoric societies on this catchment will only be elucidated through further, ongoing detailed archaeological research. Copyright ß 2004 John Wiley & Sons, Ltd. KEYWORDS: fluvial; river terraces; climate change; Danube; Romania. Introduction In contrast to the detailed Late-glacial and Holocene fluvial histories that have been constructed for river basins in northwest and northeast Europe, and interpreted with respect to climatic and land-use records (Vandenberghe, 1993; Vandenberghe et al., 1994; Rose, 1995; Schirmer, 1995; Starkel, 1995; Buch and Heine, 1995; Mäckel and Zollinger, 1995; Kalicki, 1996; Collins et al., 1996; Rumsby and Macklin, 1996; Kaliki and Sanko, 1998; Andres et al., 2001; Sidorchuk et al., 2001), the evolution of river systems draining to the Black Sea, most notably, the middle and lower Danube, remain poorly constrained. Of the studies that have been undertaken, the majority are focused on rivers flowing across the Great Hungarian Plain (Borsy and Felegyhazi, 1983; Gábris, 1987, 1995, 1998). These studies demonstrate the well-preserved nature of fluvial land* Correspondence to: Dr A. J. Howard, School of Geography, Politics and Sociology, The University of Newcastle, Daysh Building, Newcastle-upon-Tyne, NE1 7RU, England. E-mail: [email protected] forms and sediments in this part of Europe identifying a suite of six palaeochannel assemblages ranging in age from the middle of last glacial stage to the middle of the Holocene Period. Further south, with the exception of geoarchaeological studies on the Danube immediately downstream of the Iron Gates Gorge (C. Bonsall, University of Edinburgh, UK unpublished), Late Quaternary histories of rivers draining to the Danube across the Romanian Plain remain underresearched, despite the presence of well preserved alluvial terrace sequences. The Southern Romania Archaeological Project (SRAP) was initiated in 1998 to investigate middle and late neolithic land-use and settlement in the Teleorman Valley (Fig. 1) from 4500 BC (ca. 5700 yr BP). It provided an opportunity to study the alluvial evolution of this part of the Danube basin as part of a major integrated landscape history project (Bailey et al., 1999; Bailey et al., 2001; Bailey et al., 2002). This paper presents the results of detailed geomorphological, stratigraphical and sedimentological fieldwork combined with a programme of radiocarbon dating of the valley floor alluvial sequence. The resulting data set provides the first Late-glacial and wellconstrained Holocene alluvial chronology and an assessment 272 JOURNAL OF QUATERNARY SCIENCE Figure 1 The location of the Southern Romania Archaeological Project (SRAP) field study area with respect to the Rivers Teleorman and Danube of palaeohydrological conditions in the southern Romanian Plain. Comparison of this data set with alluvial sequences recorded elsewhere in central and northern Europe allows an assessment of the potential for synchronous fluvial activity across these parts of the continent. Study area The Teleorman River rises in the Carpathian Mountains and is a major left bank tributary of the Danube. It has a drainage area of approximately 830 km2, average channel gradient of 2 m km1, and channel length of 160 km. During the Pleistocene, it deposited a low-gradient fan composed of sands, gravels and marls associated with orogenic uplift of the Carpathians. The fan was subsequently blanketed by loess prior to incision towards the end of the last glacial stage (Neumann and Haită, 1999). In the wider Danube basin, fluvial terraces, lacustrine deposits, coversands and loessic material, the latter including several well-developed palaeosols, form important parts of the Pleistocene stratigraphical framework, although research on these deposits is somewhat limited (Oncescu, 1965; Conea, 1970; Burchfiel and Bleahu, 1976). Investigations have focused on a study reach 2 km long between Lăceni and Măgura (25 210 2000 E 44 210 0400 N). Here, the river has incised through approximately 20 m of Pleistocene fluvial and loess sediments to form a low gradient (falling 1.46 m km1) Holocene valley floor approximately 2 km wide. Copyright ß 2004 John Wiley & Sons, Ltd. The contemporary river, which is situated in the central part of the valley floor, is slightly sinuous with a single thread channel inset up to approximately 5 m below the Late-glacial and Holocene age terraced alluvial fills (Fig. 2). The archaeological record of the Teleorman Valley has been well studied (Spiru, 1996) and has provided important information for understanding prehistoric settlement patterns across Europe (Willis and Bennett, 1994; Bailey, 2000). The earliest notable settlement of the region is represented by the early neolithic Criş culture (from ca. 7400 yr BP, ca. 6200 cal. yr BC) and is identified by red-slipped pottery sometimes with black or white painted decoration. Criş sites are characterised by small spreads of single-roomed pit-huts located on Pleistocene age terraces 15–20 m above the valley floor. The population practiced small-scale garden horticulture (supplemented by gathering) in addition to the breeding of sheep, goat, cattle and pig and the hunting of wild cattle and pig. After ca. 6600 yr BP (ca. 5500 cal. yr BC), communities made different types of pottery (the Dudeşti culture) with diagnostic surface treatments of deep, wide incisions of curvilinear and rectilinear design. During the Dudeşti phase, people again lived on the Pleistocene age terraces, typically occupying small collections of pit-huts with some structures built at ground level; their economy was similar to the Criş culture. In the last quarter of the sixth millennium and the first half of the fifth millennium BC, changing ceramic design denoted by the cutting away of clay from the surface of the pot (excision) and the infilling of the empty spaces with white paste indicates the development of the Boian culture (ca. 6200 yr BP, ca. 5200 cal. yr BC), which was located on the Late Pleistocene and early to mid-Holocene valley floor. J. Quaternary Sci., Vol. 19(3) 271–280 (2004) RIVER DEVELOPMENT ON THE SOUTHERN ROMANIAN PLAIN 273 Figure 2 Geomorphological map of the study reach within the Teleorman Valley, southern Romanian Plain and sites referred to in the text The Boian economy was similar to the Criş and Dudeşti cultures and settlement was also within small collections of single and, in some cases, double-roomed structures either dug partially into the ground (a pit-hut) or more substantial buildings created at ground level. However, during the middle of the fifth millennium BC a significant change occurred marking the beginning of the Gumelniţa culture (from ca. 5700 yr BP, 4500 cal. yr BC). Habitation was in larger buildings, many of which had several rooms built using more substantial construction materials (larger wooden timbers, foundation trenches). These larger, more durable Gumelniţa buildings were concentrated into small villages at the edges of the Holocene valley floor, which became the focus for long-term occupation, although it is most likely that people continued to move from site to site or from one part of a landscape to another on a seasonal basis or in response to the needs of animals and resource bases. The significant difference from the Criş, Dudeşti and Boian communities is that Gumelniţa villagers chose to return repeatedly to the same places. Through time, over a period of centuries, Gumelniţa villages grew, although not necessarily continuously into monumental settlement tells as a result of repeated cycles of building, repair, destruction and rebuilding. Significant occupation of tells appears to have ceased after Copyright ß 2004 John Wiley & Sons, Ltd. 4800 yr BP (3500 cal. yr BC), although some show signs of reoccupation during the later first millennium BC and the medieval period (Bailey, unpublished). After 4800 yr BP, the population spread out, back across the landscape, although limited research into this period prevents a secure understanding of the focus of this settlement and the associated human activity. In contrast to the archaeological record, the Late Pleistocene and Holocene vegetational history of the Romanian Plain is poorly understood (Tomescu, 2000). The alkaline loess deposits of the region do not favour the preservation of organic material and no research has been undertaken on lacustrine sequences in the region (Tomescu, 2000). Further north and west, pollen analysis of a small number of lake basins in the Carpathian Mountains has provided a more detailed, radiometrically dated record of Late-glacial and Holocene vegetation. However, these pollen sites are at contrasting altitudes and are affected by significantly different local climatic conditions, preventing the secure correlation of these records on vegetational grounds (Farcas et al., 1999; Björkman et al., 2002). The present vegetation of the Romanian Plain can be divided into three broad zones, with oak forests present in the north and west, forest-steppe in the south and central area, and steppe along the eastern part of the plain adjacent to the Danube. J. Quaternary Sci., Vol. 19(3) 271–280 (2004) 274 JOURNAL OF QUATERNARY SCIENCE Pedological studies, however, have identified fossil steppe soils under recent forest soils, suggesting that forests have advanced and retreated across the steppe several times during the Holocene, possibly reaching their maximum extent on the Romanian Plain during the sub-Atlantic period (ca. 2500 yr BP) (Chişu, 1971; Tomescu, 2000). It is likely that retreat and readvance of woodland would have had significant effects on local hydrology and human activity, but without accurate dating of these events (Tomescu, 2000) the precise implications of any changes are presently unclear. available (Fig. 2). The stratigraphy recorded in these test pits is illustrated in Fig. 3. Detailed topographic profiles of the valley floor were constructed by EDM (laser level) survey at three cross-sections to determine stratigraphical relationships. The valley floor sequence illustrated in Fig. 4 is based upon transect 2 shown in Fig. 2. Once a relative chronology had been established in the field, material for radiocarbon dating was collected from key sedimentary units. In total, 11 samples of organic material were recovered and radiocarbon dated. These dates are augmented by age determinations on three samples collected by Tomescu during 1998 (Tomescu, 1998). Full details of all dates and calibrated ages are provided in Table 1. Field methods Results In the Lăceni–Măgura study reach, geomorphological mapping of the valley floor was undertaken to identify alluvial landforms, including river terraces and upstanding sand and gravel islands, palaeochannels, inset benches adjacent to the contemporary channel and alluvial fans on the western edge of the valley floor. The mappable edges of all landforms were delimited using a hand-held Garmin (GPS12) Global Positioning System (GPS), which at the time of survey had a spatial accuracy of between 2 m. These co-ordinate data were incorporated into a larger Geographical Information System data base (ArcView 3.2) captured as part of SRAP, allowing comparison of the archaeological site distribution identified through fieldwalking and test-pitting with river landforms. The sedimentology of alluvial units on the western side of the valley floor was examined in natural cut-bank exposures along the contemporary channel and in a series of large drainage ditches up to 2 m deep, which were dug across the area during the 1980s. In addition, 19 test pits, individually up to 3 m deep, were excavated by machine in areas where no other exposures were Beyond the approximately 50 m wide active channel zone, the valley floor forms a low-relief plain upon which five terrace surfaces and associated palaeochannel systems have been identified (Figs 2 and 4). Alluvial landforms are better preserved on the eastern side of the valley floor because the western side was disturbed by the excavation of drainage ditches and terracing during agricultural improvements in the 1980s. The oldest fluvial elements of the valley floor comprise a system of two terraces (T1 and T2) with gravelly–sandy bars, islands and leveés, associated with a series of high-amplitude palaeochannels between ca. 150 and 200 m wide (Fig. 2). Internally these terraces comprise poorly-bedded sandy gravels and pebbly sands in the topographically higher areas and peaty clays and peaty sands within the lower lying palaeochannels. Imbrication indicates a high variance of palaeoflow. Sediments of both these terrace units are strongly indurated by calcareous cementation, probably precipitated during periods of fluctuating water table Figure 3 Stratigraphy of sediments recorded in test pits excavated across the study reach. Locations of test pits are shown in Fig. 2. Test pit 14 quickly flooded with groundwater, requiring rapid recording and sampling; this was not undertaken by the project geomorphologists (Howard and Macklin) and therefore is not included here Copyright ß 2004 John Wiley & Sons, Ltd. J. Quaternary Sci., Vol. 19(3) 271–280 (2004) RIVER DEVELOPMENT ON THE SOUTHERN ROMANIAN PLAIN 275 Figure 4 Cross-section through the deposits exposed on the western side of the study reach valley floor. Section is based on transect 2 (Fig. 2) recorded by EDM survey (Fig. 3). Palaeochannels on these terraces are five times larger than the contemporary channel and reflect discharge conditions considerably higher than at present. A sample of wood recovered from test pit 12 at a depth of 2 m, which yielded a radiocarbon age estimate of ca. 12 880 yr BP (Beta-158852, Table 1) suggests that these large gravel-bed channels were active during part, if not all, of the Late-glacial period. Although the possibility exists that the dated sample was reworked from older sediments, its delicate condition suggests that it was not recycled and therefore represents the true age of these sediments. However, it is equally conceivable that parts of these sedimentary sequences were deposited over a prolonged time-scale, which may extend back to full glacial conditions. Settlements of the semi-mobile Boian culture have been found on top of these sandy bars, islands and levees of Terraces 1 and 2, adjacent to the large palaeochannels (Fig. 2). Radiocarbon dating of a single piece of animal bone in a securely stratified archaeological context at one of these settlement sites (Bailey et al., 2002) provided a radiocarbon date of ca. 5800 yr BP (Beta-148762, Table 1) and provides a broad upper age limit for the formation of these terrace units, although it is accepted that there could be a prolonged hiatus between the date provided by the animal bone and the final deposition of the sediments. Incised into this Late-glacial landsurface are at least three younger terraces (T3, T4 and T5) with, on the less disturbed eastern side of the valley, smaller meandering palaeochannels, on their surfaces which are approximately 50 m wide. Test pitting of the highest and most extensive terrace on the western side of the valley floor (T3) revealed approximately 2 m of clay overlying sandy gravels, with both sediment facies being cemented and indurated, although less intensely than the Copyright ß 2004 John Wiley & Sons, Ltd. Late-glacial deposits (Figs 2 and 3). Extensive contemporary channel-bank exposures through T4 and T5 revealed up to 3 m of imbricated sandy gravels overlain by up to 2 m of silt and clay. The basal sand and gravel had well-developed lowangle, lateral accretionary bedding typical of deposition within bar complexes of a laterally mobile river. The overlying finegrained sediments represent overbank deposition, and within these are a number of prominent iron- and clay-rich palaeosols (Neumann and Haită, 1999) traceable for over 100 m in section. Radiocarbon dating of T3–T5 alluvial units has helped to refine the chronology of river incision and aggradation. At the northern edge of the study reach, 14C dating of a tree trunk within the basal sands and gravels of T3 (point A, Fig. 2), close to the contemporary river bed, indicates that incision of T2 had occurred sometime before the beginning of the third millennium BC and that aggradation of T3 started sometime after ca. 4800 yr BP (Beta-147293; Table 1). This is corroborated by a date of ca. 4900 yr BP from wood within basal sands and gravels approximately 300 m downstream (point B, Fig. 2; Beta-147292, Table 1). A date of ca. 4000 yr BP from a sample of wood collected from test-pit 10 from a depth of 2.4 m and a basal sample of charred material from a lateral accretionary surface at point C dated to ca. 3800 yr BP (Fig. 2) suggest that aggradation continued until the end of the second millenium BC (Beta-158850 and Beta-147291, Table 1). Incision of T3 and aggradation of T4 had begun by the latest at ca. 3100 yr BP, demonstrated by dated material recovered by Tomescu close to point C (Fig. 2; AA-38910, AA-38911 and AA-38912, Table 1). Sedimentary exposures in test pit 14 in the neighbouring Claniţa Valley (Fig. 2) also indicate significant peat growth at the floodplain margins by ca. 2900 yr BP (Beta-161049 and Beta-161050, Table 1). J. Quaternary Sci., Vol. 19(3) 271–280 (2004) Copyright ß 2004 John Wiley & Sons, Ltd. In bar core sands and silts (T4) In bar core sands and silts (T4) In bar core sands and silts (T4) Charred material Wood Wood Wood Wood Charcoal Bone (animal) Wood Wood Wood Plant seed Plant seed Beta-147291 Beta-147292 Beta-147293 Beta-158850 Beta-158851 Beta-158852 Beta-148762 AA-38910 (GU-8997) AA-38911 (GU-8998) AA-38912 (GU-8999) Beta-161049 Beta-161050 Peat Peat In colluvial sandy clay of fan In bar top sands In bar core pebbly sands (T2) In fine grained channel fill (T5) In bar core sands and gravels (T4) In bar core sands and gravels (inset bench) In bar top sands and gravels (T3) In bar core sands and gravels (T3) In bar core sands and gravels (T3) In bar core sands and gravels (T3) SRAP 2000/07 SRAP 2000/08 SRAP 2000/09 SRAP 2001/07 (TPT 10) SRAP 2001/08 (TPT 12) SRAP 2001/09 SRAP 2000/10 (TPT 19) SRAP/ Tomescu W2.1 SRAP/ Tomescu W2.2 SRAP/ Tomescu W2.3 SRAP 2001/36 (TPT 14) SRAP 2001/37 (TPT 14) Wood Wood Bone Beta-147288 Beta-147289 Beta-147290 Location SRAP 2000/04 SRAP 2000/05 SRAP 2000/06 Material Laboratory code SRAP sample code 30.8 25.2 24.3 3100 45 3125 40 3075 70 25.6 23.6 19.5 2380 120 5880 40 2810 40 27.4 12 880 130 25.2 25 25 25 27.5 3800 60 4980 80 4820 60 4000 80 2930 40 25 25 19 1050 60 3360 70 190 60 Conventional 13CPCB age (BP) 0.1% AMS AMS AMS AMS AMS R AMS R R R R R R R R Radiometric (R) or AMS assay BC BC BC BC BC 1040–850 1270–1000 1500–1128 1494–1265 1488–1223 2450–2040 3960–3640 BC 3700–3510 and 3420–3390 BC 2860–2810, 2750–2720 and 2700–2290 BC 13 850–13 310 and 12 630–12 520 BC 800–180 BC 4810–4680 BC BC BC 880–1050/AD 1100–1140 1870–1840/BC 1780–1500 AD 1530–1550/AD 1630–1950 AD Calibrated to 2 cal. yr, BC/AD 2990–2800 3220–2950 3450–3078 3443–3214 3437–3172 4400–3990 5910–5590 5650–5460 and 5370–5340 4810–4760, 4700–4670 and 4650–4240 15 800–15 260 and 14 580–14 470 2750–2130 6760–6640 1070–900/850–810 3820–3780/3730–3450 420–400/320–0 Calibrated years BP Table 1 Radiocarbon dates from the Teleorman River valley, southern Romania collected as part of the Southern Romania Archaeological Project (SRAP). All Beta dates are calibrated using INTCAL 98 (Stuiver et al., 1998); dates AA-38910-38912 are calibrated by the University of Washington, Quaternary Isotope Laboratory Radiocarbon Dating Programme, Rev. 4.0 1998 276 JOURNAL OF QUATERNARY SCIENCE J. Quaternary Sci., Vol. 19(3) 271–280 (2004) Figure 5 Correlation of river activity within the Teleorman Valley with other geomorphological proxy records across central and northern Europe. Sources of this information are: Passmore et al. (unpublished); Macklin and Lewin (1993); Starkel (1995); Kalicki (1996); Kalicki and Sanko (1998); Alexandrowicz and Alexandrowicz (1999); Andres et al. (2001); and Sidorchuk et al. (2001) RIVER DEVELOPMENT ON THE SOUTHERN ROMANIAN PLAIN Copyright ß 2004 John Wiley & Sons, Ltd. 277 J. Quaternary Sci., Vol. 19(3) 271–280 (2004) 278 JOURNAL OF QUATERNARY SCIENCE The lower Holocene terrace units (T4 and T5) are overlain by sands, silts and clays, and radiocarbon dating of wood from a small channel fill scoured into the top of the sands and gravels at point D (Fig. 2) indicates fine-grained alluviation began soon after 1000 yr BP (Beta-147288, Table 1). However, charcoal recovered at a depth of 1.5 m (test pit 19) within an alluvial fan on the western side of the valley floor (Fig. 2) provided an age determination of ca. 2400 yr BP (Beta-158852; Table 1), indicating significant slope erosion and deposition at valley floor margins around this time. The present channel and floodplain of the Teleorman River is entrenched approximately 5 m below the Holocene age terraces. Radiocarbon dating of animal bone from within a bench approximately 1.5 m above the contemporary channel gave an age of ca. 190 yr BP (point E, Fig. 2; Beta- 147290, Table 1), indicating that this phase of incision occurred sometime between the twelfth and sixteenth centuries AD. Discussion Figure 5 illustrates the timing of periods of enhanced Late Pleistocene and Holocene fluvial activity in the Teleorman Valley with respect to other fluvial systems across central and eastern Europe (Macklin and Lewin, 1993; Starkel, 1995; Kalicki, 1996; D. G. Passmore et al., University of Newcastle, unpublished). River activity in some of these latter systems has been linked to climatic change through correlation with other geomorphological proxy records including lake-level and glacier fluctuation data in the Alpine zone, landslides in the Carpathians (Starkel, 1995; Kalicki, 1996; Alexandrowicz and Alexandrowicz, 1999) and raised bog stratigraphies in the UK (Macklin, 1999). In the Teleorman Valley, palaeochannels on Terraces 1 and 2 have a similar morphology to those recorded from the Maas basin in The Netherlands (Vandenberghe et al., 1994), the Tisza basin in Hungary, the Warta and Vistula basins in Poland (Vandenberghe et al., 1994; Kalicki, 1996) and across the East European Plain (Sidorchuk et al., 2001). All of these examples date from ca. 25 000 yr BP and were abandoned during the Late-glacial, by ca. 11 000 yr BP, their size reflecting both higher discharges and permafrost preventing groundwater throughflow (Sidorchuk et al., 2001). Variations in local geological conditions including channel slope and bedload type have been used to explain regional discrepancies in the timing of abandonment, which in the northern part of the East European Plain (EEP, Fig. 5) may not have occurred until ca. 8500 yr BP (Vandenberghe et al., 1994; Sidorchuk et al., 2001). Although only a single age determination, the date of ca. 12 800 yr BP from a large meander on T2 sits well within this established chronology and indicates that it was probably active during the Late-glacial period. The timing of large meander abandonment in the Teleorman Valley is unclear because no fluvial units of early Holocene age have been identified or dated. However, archaeological evidence and radiometric dating indicates that people of the Boian culture were occupying the gravelly–sandy bars, islands and leveés immediately adjacent to these large palaeochannels for prolonged periods around 5800 yr BP (Beta-148762, Table 1). Occupation of this area would have been unlikely if these were still active primary channels and this therefore provides a broad upper age for these features. From the middle Holocene, the Teleorman River underwent net aggradation at around 4900–4800 yr BP, 4000–3800 yr BP, 3300–2800 yr BP and 1000 yr BP, punctuated by phases of river Copyright ß 2004 John Wiley & Sons, Ltd. incision. In addition, a phase of alluvial fan deposition on the western side of the valley floor is dated to ca. 2400 yr BP (Fig. 5). All these periods of alluvial sedimentation correlate well with periods of climatic cooling, increased humidity and enhanced fluvial activity (flood frequency and magnitude) recorded elsewhere in central, northern and western Europe (Macklin and Lewin, 1993; Starkel, 1995; Kalicki, 1996, Rumsby and Macklin 1996) and other geomorphological records, including landslide activity in the Carpathian Mountains (Alexandrowicz and Alexandrowicz, 1999) and bog oak chronologies in Germany (Spurk et al., 2002). Phases of calcium precipitation and cementation of alluvial sediments in the Teleorman Valley could relate to a number of these wetter phases, with calcareous precipitation recorded in Poland, for example, before 5000 yr BP and between 4100 and 3200 yr BP (Starkel, 1995). It is not yet possible to ascertain whether human activity was important in changing the nature of the hydrological regime in this region. Pedological studies across the Romanian Plain have indicated that forests have advanced and retreated across the steppe several times during the Holocene in response to climate change, possibly reaching their maximum extent on the Romanian Plain during the sub-Atlantic period (ca. 2500 yr BP) (Chişu, 1971; Tomescu, 2000). These ecotonal changes would have had significant effects on local hydrology and these may have led to some of these episodes of increased river activity and chemical precipitation in the Teleorman Valley, although the lack of dating of these vegetational changes prevents a detailed comparison with the fluvial record. The archaeological record provides evidence for human occupation and a small-scale garden horticulture economy in the Teleorman Valley from the early neolithic period (ca. 7400 yr BP). However, the fluvial record suggests that the impact of these peoples on the landscape (in the form of, for example, enhanced slope channel sediment coupling associated with devegetation) appears to have been limited with no evidence of significant fluvial activity for another ca. 2500 yr. Further, enhanced fine-grained sedimentation, which is commonly associated with human-induced soil erosion (Robinson and Lambrick 1984; Brown and Barber, 1985; Macklin et al., 1991; Brown, 1992; Hunt et al., 1992) is not noted until ca. 2400 yr BP, approximately 5000 yr after the first neolithic farmers. It may be that the impact of these early farmers on the landscape was slight or that clearance was taking place in conjunction with woodland management (coppicing, pollarding) thereby reducing degradation of the natural environment as suggested for the neolithic period and Copper Age of northeast Hungary (Gardner, 2002). However, the retreat of forest habitats after ca. 2500 yr BP, through a combination of climate change and the intensification of human activity may explain the increased fine-grained sedimentation recorded in alluvial fans and more recent river incision in response to higher rates of runoff. Unfortunately, at present, the archaeological record of the later prehistoric and historic periods in the Teleorman Valley is poorly understood and it would be unwise to attempt to link these phases of enhanced fluvial activity to human practices. Conclusions This study of the Teleorman Valley in the southern Romanian Plain has identified a suite of five major river terraces and associated palaeochannel systems, which record changing climatic conditions from the Late-glacial through to the middle and late Holocene and approximately 5 m of entrenchment in the central part of the valley floor within the past 1000 yr. The increase J. Quaternary Sci., Vol. 19(3) 271–280 (2004) RIVER DEVELOPMENT ON THE SOUTHERN ROMANIAN PLAIN in fine-grained sedimentation across the valley floor may be linked to changing sediment supply and alluvial fan deposition around 2400 yr BP. These episodes of alluviation appear to have parallels with records established elsewhere in central and northern Europe. Starkel (1995) has suggested that the cyclonic nature of circulation across Europe may explain the strong correlations between ‘black oak’ deposition in southern Germany and southern Poland and weaker correlations between southern and northern Poland. The record presented here from the Teleorman Valley, a tributary of the Danube, suggests that despite major physiographic barriers separating the southern Romania Plain from other parts of central Europe, strong parallels exist between alluvial and other geomorphological records. Human activity appears to have had little effect on the environment, with significant fine-grained sedimentation not noted until ca. 2400 yr BP, approximately 5000 yr after the first neolithic farmers settled the area. Whether this record truly reflects the impact of prehistoric societies on this catchment is unclear at present. Ongoing work in this part of southeast Europe aims to further elucidate these relationships. Acknowledgements The Southern Romania Archaeological Project (SRAP) is grateful for financial support from the Society of Antiquaries, the British Academy, Cardiff University, The National Historical Museum of Romania, the Romanian Ministry of Culture, the Teleorman Regional Historical Museum and the Teleorman Regional Council. AJH and MGM gratefully acknowledge financial assistance to undertake geomorphological studies of the Teleorman Valley as part of this project. Thanks are also due to Lois Wright and Ann Rooke for drawing the figures, Steve Trick for additional GPS survey, and Costel Haită and Amy Bogaard for sampling test pit 19. The comments of Dr Jamie Woodward and Professor Jef Vandenberghe improved this manuscript and are gratefully acknowledged. Further details of SRAP can be found at www.cf.ac.uk/srap/ References Alexandrowicz SW, Alexandrowicz Z. 1999. Recurrent Holocene landslides: a case study of the Krynica landslide in the Polish Carpathians. The Holocene 9: 91–99. 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