Wincliell.jJ 
246 
[Jan. 4, 
No. 7. Ohio Black Shale, embracing beds of fire-clay and septctria, 320 “ 
-j^r g (Buff-colored limestone, arenaceous (“Cliff Limestone”) 
' ' \ with beds of lenticular Iron Ore near the bottom. 
No. 9. Brown and light colored clays (Dr. Locke’s “Marl”). 
jt w Q C Middle or Flinty Limestone, underlaid by yellow clay con- 
* ’ ( taming thin layers of limestone. 
No. 11. Blue Limestone. 
The “ Waverly,” of Ohio, is regarded by Prof. Andrews, as extending 
from the “Subcarboniferous Limestone (No. 3), to the “Ohio Black 
Shale” (No. 7). The Chemung and Portage may be embraced in No. 6 . 
No. 7 is generally regarded as the equivalent of the “ Genesee Shale,” 
of New York. 
No. 8 is found to contain the following Niagara species : Trematopora 
tubulosa, Hall; Caryocrinus ornatus, Say ; Betepora aspero-striata, Hall; 
Obolus imbricatus, n. sp. ; 114 strophomena striata , Hall; S. rhomboidalis, 
Wahl; S. N iagarensis, Win. & Mar.; Hemipronites subplanus, Con. sp .; 115 
H. Win. & Mar.; Ortliis elegantula, Dalm. sp.; Cornulitesflexuo- 
sit§, Hall ; 116 Spiriflra sulcata , Hising, sp; Atrypa reticularis, Dalm. A. ne- 
glecta, Hall; A. cuneata, Hall; Meristellanitida, Hall, Pentamerus sp?; Plat- 
yo stoma Niagarense? Hall, 117 Orthoceras sp?; JDalmania limulurus, Green 
sp., Gcdymene Niag.arensis, Hall. 
No. 9 of Andrews’ section contains the following species, some of which 
are known to belong to the Clinton group : Busophycus clavatus and bilo- 
batus, Hall; Fenestella prisca, Hall, and Obolus imbricatus? n. sp. 
It will be noticed that Hie characteristic fossils of the Waverly Group 
are traced to near Shafer’s, on Oil Creek, Pa., at a locality ^aidtobe “200 
to 300 feet below the coal,” where we find such species as Chonetes pul- 
chella Win.; Lingula membranacea Win.; Hemipronites inegualis, Hall sp.; 
Syringotliyris typa, - Win.; Spirifera Carteri, Hall; Discina Gallalieri, 
Win.; with others common to the Waverly and later formations. At 
Kinzua, Pa., however, which is stated to be “800 or 400 feet below the 
Coal Conglomerate,” we seem to have passed into the limits of another 
fauna. Not a single species can be recognized as belonging to the Wa¬ 
verly. On the contrary, Spirifera clisjuncta (Phillips) Hall, a species of 
the Chemung Group, of New York, is conspicuous and well determined. 
Fragments of lamellibranchs which appear to belong to the Chemung 
Shell small, nearly circular, with a slightly projecting beak in the ventral valve, false area very 
small and inconspicuous, central median ridge'distinct hut delicate, becoming broader anteriorly, 
and vanishing in front of the centre; a longitudinally oval scar on each side of the central ridge. 
Surface marked, especially in the older shells, by numerous concentric imbricating lamellae of 
growth. Transverse diameter 5-16 inch; length of ventral valve about the same. This is a smaller 
species than O. Conradi, Hall, with a more lamellose exterior, and, so far as I have been able to ob¬ 
serve, a different cardinal structure. 
ns Several specimens, agreeing very well with the description and figures of New York speci¬ 
mens, but apparently nut the same as the Illinois specimens referred to this species. (Ill. Geol.liep 
III, 349). 
ns The single specimen has the rings somewhat constricted below, instead of regularly convex 
as in C. arcuatas Con. 
nv A carinated shell, more appressed laterally than the carinated varieties figured by Prof. 
Hall. 
