Surficial Geologic Materials
o
91
o
91
o
41
21' 47"
R05W
49' 51"
17' 56"
Wap
Walker
o
R06W
R07W
R08W
sipin
icon
42
of Linn County, Iowa
17' 46"
Geological Survey Bureau
Coggon
Open File Map Series 98-2
River
P r e p a re d b y
D eb or a h J. Q u a d e
T86N
E . Ar t hu r B ett is III
T86N
G r eg A . L u dvig s on
Prairieburg
Ja m es D . G ig lier a n o
M a u r een K . S la u gh ter
E n er g y a n d G eolog i ca l R esou r ces D i vis i on
G eol og ica l S u r ve y B u r ea u
Ja n u a r y 1 9 9 8
Central City
S u p p or t ed by th e U .S . G eolog i ca l S u r v ey, D ep a r t m en t of I n ter i or ,
u n d er a s s ist a n ce A w a r d N o. 1 4 3 4 - H Q -9 6 - A G - 0 1 4 8 7 .
Center Point
Cedar
T85N
T85N
River
Alburnett
Io w a D ep a rtm en t o f N a tu ral R es ou rc es
L a rry J . W ilso n , D irec to r
Wap
sipin
icon
ACKNOW L EDGM ENTS
er
Riv
R ecog n i z ed for d i r ect con t r ibu tion s to th e m a p ’ s p r od u ct ion :
D .L . K och , B . J. W it z k e,
B . E . H oyer , M .R . H ow es , B . J. Bu n k e r a n d R. R . Row d en of t h e I D N R G eolog i ca l S u r v ey
Bureau,
B .B .
C u r r y,
R.
M a n d el
of
th e
U n iv e r si ty
of
K a n sa s,
T.
Jon es ,
E.
R ober t s ,
K .H a i a r , J. T h om a s , M . E lli s , a n d P. T h om p son of C or n el l C ol leg e, I owa D e p a r tm en t of
T r a n s p or ta tio n ,
S er v ice,
L in n
U .S .
D ep a r t m en t
of
C ou n t y E n g in eer in g ,
A g r icu l tu r e
L in n
-
N atural
C ou n ty P l a n n in g
R esou r ces
and
Z on i n g ,
C on ser v a t ion
R .E .
N ov otn y
W ell D r il lin g C om p a n y, a n d l a n d ow n e r s w h o g r a n ted a ccess for fi eld stu d i es .
t h a n k s i s ex t en d ed t o R ebecc a P a lm er , D ir ec tor of L i n n
T84N
C ou n ty Pl a n n in g a n d
S p eci a l
Z on i n g ,
f or coor d i n a tio n w ith g ov er n m en t a g en ci es i n L i n n C ou n ty.
Robins
T84N
L E G EN D
Springville
D e sc riptio n o f M a p U nits
Palo
Hiawatha
H O L OC E N E
Qal
Marion
AL L U VIU M ( D e F o r e s t F o r m a ti o n ) - - O n e t o f o u r m e t er s o f m as s ive to we ak l y s t r at if i e d, gr ay is h br o wn t o br o wn l o am , s il t l o am , c l ay lo am , o r l o am y s and o ve r l y ing l e s s t han t hr e e m et e r s o f po o r l y
t o m o de r at e ly w e ll s o r te d, m ass ive to m o d er ate l y we l l s t r at if i e d, c o ar s e t o f i n e f e ld s p at hic qu ar t z s a nd , p eb b ly s an d , an d g r ave l i n s m al l val le y s an d m o r e th an th r e e m e t er s o f p r e- W is co ns i n o r l at e
W is co ns i n N o ah C r e e k F o r m at io n s an d an d gr ave l.
Qdb
U n i t al s o i n cl u de s c o l l uvia l de p o s i ts d e r i ve d f r o m ad ja ce n t m ap u n it s .
S e as o na ll y h igh w at er tabl e s o c c ur in t h is m ap uni t.
M U C K AN D P E AT ( D e F o r es t F o r m ati o n , W o de n M e m be r ) - - O n e t o s i x m e t e r s o f b la ck to b r o wn m uc k , p eat, a nd o t he r o r g an ic - r i c h d ep o s i t s i n f e ns an d m ar s he s .
d e pt h .
O ve r li e s s an d an d gr ave l an d/ o r m as s ive, f r ac t ur e d , l o am y gl ac i al t il l o f t h e W o l f C r ee k o r Al bur n et t f o r m ati o n s .
M as s ive t o
w el l s t r at if i e d at
H i gh w at e r t ab le s o cc u r i n th i s m ap u ni t .
W IS C O N S IN A N
L O ESS AN D IN TE R CAL ATE D E O L IAN SAN D ( P e o r i a Sil t ) - - Tw o t o s e ve n m e t er s o f ye l l o wi s h b r o wn t o
Qpt
m e di um , w e ll s o r te d , f e l ds pa th i c qu ar t z s an d .
gr ay, m as s i ve , j o int ed , c al c ar e o u s
o r no n c al ca r eo us , s i lt l o am and i nt e r c alate d f in e
to
G r ad es do wn war d t o p o o r ly t o m o de r at e ly we ll s o r te d , m o de r at e ly to w el l s tr ati f i ed , c o ar s e to f i ne f el d s p at hi c q u ar t z s an d , lo am , o r s i lt lo a m al luvi u m ,
o r i n s o m e p la ce s t he e o l i an s ed i m e nt s o ve r l ie a c l aye y F ar m da le / S an gam o n G e o s o l de ve l o pe d i n a ll u vi um .
Th es e all u vi al f il l s a r e
be n e at h t h e L at e P ha s e
H ig h Ter r ac e
( no
pa le o s o l b en e at h t he
l o e ss ) an d E ar l y P h as e H igh Te r r ac e ( pale o s o l b e ne at h t he l o e s s ) o f t he Io wa/ Ce d ar B as in .
L O ESS AN D IN TE RC AL ATED EO L IAN SAN D ( P e o r ia S il t ) - - Two
T83N
T83N
Qps1
i nte r c al at ed f i n e to m e di um , we l l s o r t e d , f el d s p at hi c q ua r tz s a nd .
to
t en m e t er s
o f ye l lo w i s h br o w n to g r ay, m as s ive , f r ac tu r e d, no n c al car eo u s gr ad i ng d o wn w ar d to
San d i s m o s t ab u nd ant i n lo we r p ar t o f e o l ian pa ck age .
calc ar e o u s
s il t
l o am
and
O ve r li e s m as s ive, f r ac t ur e d , l o am y gl ac i al t il l o f th e W o lf C r e e k o r Alb u r ne t t
f o r m at io n s wi t h o r wit h o ut i nte r ve n in g c laye y F ar m dale / San gam o n G e o s o l .
E O LIAN S AN D ( P e o r i a S i lt - s an d f ac i e s ) - - Tw o t o f if t e e n m e te r s o f ye l lo w i s h b r o wn t o g r ay , m o de r at el y t o we l l s t r at i f ie d n o n c a lc ar e o us o r c al c ar e o us , f ine t o m e di u m , w el l s o r t e d , f e l ds pathi c
Qps2
CEDAR RAPIDS
q u ar t z s an d.
M ay co nt ai n in t er b e ds o f y e ll o wis h br o w n t o g r ay , m as s ive , s i l t lo am l o e s s .
O ver l i es e r o de d , m as s ive, f r ac t ur e d , l o am y gl ac i al t il l o r f r a ct u r e d D e vo ni an - age c ar bo n at e b ed r o c k.
L O ESS SH ALL O W TO S AN D AN D G RAVE L ( P e o r ia Si lt ) - - O ne t o t wo m e t er s o f y e ll o wis h br o w n , m as s ive, n o nc al c ar e o us si l t lo am .
Qps4
O ve r l ie s pe bbl y s and a nd g r avel e r o s i o n s ur f ac e s e di m e n t t hat
i s o ne t o t h r e e m et e r s t h ic k, wh ic h , i n t ur n, o ve r li e s e r o de d m ass ive, f r ac t ur e d , f i r m , l o am y g l ac ia l ti l l o f t h e W o l f Cr e e k o r Al b ur ne tt f o r m at i o ns .
S e as o na ll y hi gh wate r tabl e m ay o c c ur i n t hi s m ap
u n it .
S AN D AN D G R AVE L SH ALL O W TO TIL L ( U n n am e d e r o s i o n s u r f ac e s e di m e n t) - - O ne t o t h r ee m e te r s o f ye l lo w i s h b r o wn t o g r ay, m as s i ve t o w eakl y s tr ati f i ed , n o nc al c ar e o us , m e di u m to c o ar s e ,
Qwa1
p o o r l y s o r t e d f e ld s p at h ic pe b bl y q u ar t z s an d w i th int e r c al at e d g r ave l an d lo am .
O ve r l i e s m as s i ve , f r ac t ur e d , f i r m , l o am y g l ac i a l t i ll o f t he
m ap pi n g uni t ar e d er i ve d p r im ar i ly f r o m e r o s i o n o f g la ci al t i ll i n t he adj ac e nt d r ai n ag e bas i n.
W o l f C r e e k o r Al b ur n e tt f o r m a ti o n s .
D e p o s i ts
in t hi s
Se as o nall y h igh w at er tabl e m a y o cc u r i n th i s m ap uni t .
Bertram
Qwa2
L O AM Y AN D SAN D Y SE D IM EN T S H AL L OW TO G L AC IAL TILL ( U nnam e d e r o s i o n s u r f ac e s ed i m e nt ) - - O n e t o th r e e m e t er s o f y e l l o wi s h b r o wn t o
p o o r l y s o r t ed l o am y, s a nd y an d si l ty e r o s i o n s u r f ac e s e d im e nt .
gr ay, m as s i ve
to
we ak ly
s t r at i f ie d , wel l to
M ap u ni t i nc l ud e s s o m e ar e as m ant l ed wi th l e s s th an t wo m e t er s o f P e o r ia Si l t ( l o es s ) . O ve r l ie s m as s i ve , f r ac t ur e d , f ir m gl ac ial t il l o f
t he W o l f C r e e k an d Alb u r ne t t f o r m at i o ns . Se as o nall y hig h wat e r ta bl e m ay o cc u r i n th i s m ap u ni t .
W IS C O N S IN A N A N D P R E -IL L IN O IA N
C o m pl e xe s
Mount Vernon
S AN D AN D G R AVE L ( N o ah C r e e k , W o l f C r e ek , an d Al bu r ne t t f o r m at io n s ) - - M o r e t han t hr e e m et e r s o f ye ll o w is h b r o wn to g r ay , po o r l y t o we l l s o r t e d, m as s ive t o
Qnw
f e l ds path i c qu ar t z s and , pe bbl y s an d an d gr ave l .
u n it al s o i nc l ud e s e xh u m e d i n te r t il l s and and g r avel o f t he
Lisbon
we l l s t r at if i e d, c o ar s e
to
In p l ac es m ant l ed w i th o ne t o t hr e e m et e r s o f f i n e t o m e di um , we l l- s o r te d f e l ds pa th i c q uar tz s an d d e r i ve d f r o m wi nd r e wo r k in g o f t he al lu vi u m .
W o l f C r ee k an d Al bu r n et t F o r m at i o n.
S eas o nal ly ac t ive s e e p s m ay o c c ur i n th e s e
int e r t i ll s e t ti n gs .
El s e w he r e
th e
f i ne
Thi s
uni t e n co m pas s e s
d e po s it s th at acc u m u late d dur i n g the W i s c o ns i n E p is o de .
Fairfax
T82N
D E V O N IA N
Cedar
T82N
Du
F R ACTU R ED CAR BO N ATE BE D RO C K - - In t er b e dd e d li m e s t o ne s an d d o lo s to n e s. L o c al ly de ve lo pe d as be d r o c k aqu i f er .
S IL U R IA N
Su
r
F R ACTU R ED CAR BO N ATE BE D RO C K - - Var ia bl y p o r o us an d c he r t y do l o st o n e. R e gi o nal be d r o c k aqu i f er .
Rive
F R ACTU R ED CAR BO N ATE BE D RO C K - - Ar e as w he r e D e vo nian an d Sil u r ian be d r o ck ar e le s s t ha n 2 5 f e e t b e lo w t h e land s ur f ac e .
Ely
o
41
o
41
51' 42"
o
91
49' 52"
R08W
R07W
R05W
R06W
o
91
51' 36"
An thr o po g e ni c U n i t s
21' 57"
Qq
SCALE 1:100,000
Q U AR R IES AN D P I TS - - L im es to n e q ua r r ie s and s an d an d gr ave l p it s .
E xt e nt as o f 1 9 9 0 s h o wn.
C U T AN D F IL L - - Ar e as o f c ut an d f i ll as s o c i at e d wit h m aj o r h i gh way s , ai r po r ts and r et ai l and in d us tr i al de ve l o pm en t s .
1
0
1
2
3
4
5
Miles
Qi
m ay have s i g ni f i ca nt m an t le s o f f il l o r d ee p c u ts t h at e xpo s e u nd e r lyi ng de p o s i ts .
D ep o si t s wi t hi n t his m ap u n it ar e s im il ar t o t h o s e i n adj ac e nt m ap un i ts bu t
L es s e x t en s i ve de po s i ts o c c ur al o n g al l r o a ds and in de vel o p ed ar e as
th r o u gh o u t t h e c o u nt y .
E x t en t as o f 1 9 9 0
s ho w n .
W
1
0
1
2
3
4
5
Kilometers
W ATE R – Ri ve r s , l ak e s an d s m al l p o n ds
b l o ck e d by m ig r at i o n o f s and d u ne s .
f o r m e d b y bl o c kage
o f d r ai nage w ay s an d r ive r c han ne l s . M o s t p o n ds
ar e
co ns t r u ct e d, but a f e w w e r e f o r m ed nat ur a ll y whe n e x is ti n g d r ai n ag ew ay s we r e