Winehell.] -^'*^ [Jan. 4, 



No. 7. Ohio Black Shale, embracing beds of &re-claj and septaria, 320 " 

 1^ Q (Buff-colored limestone, arenaceous ("Cliif Limestone") 



■ i with beds of lenticular Iron Ore near the bottom. 

 ISTo. 9. Brown and light colored clays (Dr. Locke's "Marl"). 

 •pj- -1 A ( Middle or Flinty Limestone, underlaid by yellow clay con- 



( taining 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 

 tuiulosa, Hall ; Caryocrinus ornatus, Say ; Betepora aspero-siriata, Hall ; 

 Obolus imhricatus, n. s^.;^'-^ stropJwmeJia striata, Hall; 8. rJwmboidalis, 

 "VVahl; 8. JSliagarensis, Win. & Mar.; Hemipronites suipilanus, Con. s-p.;^'-^ 

 H. hemiaster, Win. &M&V.; OrtJiis elegantula, Dalm. sp. ; CorhuUtesflexuo- 

 stis, Hall;"6 8piriflra sulcata, Hising, sp; Atrypa reticularis, Dalm. A. ne- 

 glecta. Hall ; A. cuneata. Hall; Merisiellanitida, Hall, Pentamerussp?; Plat- 

 yostoma J^iagarense? Hall,^^'^ Orthoceras sj)?; Dalmania limulurus, Green 

 sp., Calymene Niagarensis, Hall. 



No. 9 of Andrews' section contains the foUowins; species, some of which 

 are known to belong to the Clinton group : Rusopliycus clavatus and bilo- 

 batus. Hall; Fenestella prisca, Hall, and Obolus imbricatus? n. sp. 



It will be noticed that the characteristic fossils of the Waverly Group 

 are traced to near Sliafer's, on Oil Creek, Pa., at a locality said to be "200 

 to 300 feet below the coal," where we find such species as Chonetes pul- 

 cliella Win.; Lingula membranacea Win.; Honipronites inequalis, Hallsp. ; 

 8yringothyris typa. Win.; Spirifera Carteri, Hall; Discina Gallaluri, 

 Win.; with others common to the Waverly and later formations. At 

 Kinzua, Pa., however, which is stated to be "300 or 400 feet below the 

 Coal Conglomerate," we seem to liave passed into the limits of another 

 fauna. Not a single species can be recognized as belonging to the Wa- 

 verly. On the contrary, 8pirif&ra disjtmcta (Phillips) Hall, a sjjecies of 

 the Chemung Group, of New York, is conspicuous and well determined. 

 Fragments of lamellibranchs which appear to belong to the Chemung 



i" Shell small, nearlj' circular, with a slightly projecting beak in the ventral valve, false area veiy 

 rmall and inconspicuous, central median ridge distinct but 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 tlie 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 0. Cotiradi. Hall, with a more lamellose exterior, and, so far as I have been able to ob- 

 serve, a different cardinal structure. 



"5 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. (111. Geol.Kep 

 111,349). 



Ill' The single specimen has the rings somewhat constricted below, instead 'of regularly convex 

 as in C. arcuatm Con- 



11" A carinated shall, more appressed laterally than the carinated varieties figured by I'rof. 

 Hall. 



