Jan., 1914.] Richmond Beds of the Cincinnati Group. 
233 
Sometimes 2'-3' below this second Tetradium reef is another 
1' of Tetradium. Between these Indian Creek exposures and 
Oxford this reef disappears and is not known to the east. 
And between the two reefs at this locality are not only the 10' 
of Bryozoa beds, but about 20' of characteristic soft, lumpy, 
shaly Whitewater strata with the characteristic Whitewater 
fauna. The Rhvnehotrema dentata beds appear just above the 
reef. Hence we see from the position of these two reefs that the 
Saluda is in part the equivalent of the Whitewater. 
Returning to the Madison section to pick up another marker 
and trace it through, we find that the extreme top of the Richmond 
is again fossiliferous. Just above the Hanging Rock these fos- 
siliferous strata begin with 8" of thin limestones and dark shale, 
with Bvssonychia richmondensis, Pterinea demissa, Orthoceras 
hammelli, Labechia ohioensis, and Tetradium minus. Next is 
a 16" massive dark limestone, with a richly fossiliferous film of 
rather poorly preserved fossils on the top. These fossils constitute 
a distinct and peculiar fauna, part of which appears to have no 
near relationship in the Cincinnati. The more common species 
are Labechia montifera, Labechia sp., Streptelasma sp., Cteno- 
donta sp., Pterinea demissa, Liospira sp., Holopea hubbardi, 
Lophospira hammelli, Orthoceras hitzi, O. gorbeyi, and Cyrtocer- 
ina madisonensis. At the exposures along the road to Hanover, 
three miles west of Madison, there are added Hebertella sinuata, 
Platystrophia acutilirata, Leperditia caecigena, Labechia ohioensis 
and Tetradium minus, there being no distinction here between 
the two fossil layers as at Madison. This assemblage of fossils 
constitutes the so-called “Hitz fauna.” 
Between the Hitz fauna proper at Madison and the Ordovician- 
Silurian contact, ’s a 2' 4" limestone with all of the ostracods listed 
from the Saluda of Oxford, except Leperditia appressa, and with 
Entomis madisonensis added. This ostracod limestone is not 
distinct at the locality three miles west. 
Between Madison and Cooper’s Falls the Tetradium and Labe¬ 
chia become consolidated into a rather definite reef, though not 
of great thickness. At Cooper’s Falls this reef is C/f thick. It 
is about 19' above the second Tetradium reef and 5' beneath the 
Silurian contact. These o' are massive limestones much like the 
top limestones at Madison, and carry a reduced Hitz fauna. The 
Hitz fauna is seen no farther toward the north. 
This third reef is seen constantly at about this level, whereever 
it is exposed, around the northern edge of the Cincinnati outcrops 
as far east as the vicinity of Waynesville, O. The only place 
where it was not seen was at Laurel, and a more careful examina¬ 
tion of the strata would doubtless show it here. 
On Elkhorn Creek the total thickness of the beds between the 
level of the lower reef and the Silurian contact is about 125', as 
