73°10'W
Ocb
u
Ocw
73°12'W
Ocbu
Ocbe
44°2'N
44°2'N
Os
TAM
Ob
Ocw
Oh
fault
Oh
Ocu
Oh
Omi
Oh
44°0'N
44°0'N
Omi
0
0.25
0.5
1
Kilometers
Copyright: © 2010 National Geographic Society
73°12'W
73°10'W
Bedrock Geology near the Trail around Middlebury
(R. Coish, 2013; Geology after Ratcliffe et al., 2011)
~450
milllion yrs.
Oh
Omi
Hortonville Formation - black shale & limestone
Middlebury Limestone - blue-gray limestone, thin beds
Ocbe Chipman Fm. (Beldens member) - limestone, dolostone and marble
Ocw Chipman Fm. (Weybridge member) - marble and dolostone
Ocbu Chipman Fm. (Burchards member) - gray limestone with dolostone
~495
million yrs.
Ob
Bascom Formation - limestone, dolsotone, marble, sandstone
Os
Shelburne Marble - marble with limestone
Ocu Cutting Dolostone - gray dolomitic sandstone