Period |
Formation |
Member |
Stauffer
Zone |
Biostratigraphic Zone |
| Mississippian |
Bedford Shale |
|
|
|
|
Disconformity |
| Upper Devonian |
Ohio shaleDark shale700 ft |
|
|
Fossils very scarce |
| Middle Devonian |
Olentangy Shale
Light shale
30 feet |
|
|
Fossils very scarce, found mostly in
nodular limestone |
|
Delaware Formation
Impure limestone
36 feet |
|
M |
5th bone bed on top
4th bone bed near bottom |
|
|
|
L |
3rd bone bed
Hadrophyllum dorbignyi Zone |
|
|
|
K |
Grammysia biscucota Zone |
|
|
|
J |
Tentaculites scalariformis Zone
also crinoid lens |
|
|
|
I |
Martinopsis maia Zone |
|
Columbus Limestone
Normal limestone
105 feet |
Delhi Member
(Klondike) |
H |
2nd bone bed on top
Nucleocrinus verneulli Zone
1st bone bed near bottom |
|
|
|
G |
Goldringia cyclops
Zone
(Cephalopod zone) |
|
|
|
F |
Brevispirifer gregorlus Zone |
|
|
|
E |
Spirifer macrothyris Zone |
|
|
Eversole Member |
D |
Laevidentalhum martinei Zone
(Gastropod zone) |
|
|
Bellpoint Member |
C |
Coral Zone |
|
|
|
B |
Fossil scarce, poorly preserved |
|
|
|
A |
Conglomerate |
|
Disconformity |
| Silurian |
Monroe Formation |
|
|
|
