130 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 52 



concretions. The following is a partial list of the fauna of 



this limestone : 

 Mcgistocrinus rugosics Lyon and Casseday. 

 Mcgistocrinus daprcssus Hall. 

 Ancyroci'inus bulbosjts Hall. 

 Gcimccocrinus kcntuckicnsis Shumard. 

 Dolatocriniis grccnci Miller and Gurley. 

 Dolatocrinus bulbosus Miller and Gurley. 

 Favosites placenta Rominger. 

 Alveolites goldfussi Billings. 

 Hcliophyllutii jtivciic (Rominger). 

 HcUophyUum cornicuium (Lesueur). 

 Hcliophyllum halli Edwards and Haime. 

 Cystiphylliiin aincricanuin Edwards and Haime. 

 Diphyphyllum archiaci Billings. 

 Acerviilaria davidsoni Edwards and Haime. 

 Dendropora ornata Rominger. 

 Athyris fiiltoncnsis (Swallow). 

 Spirifcr Iwbbsi Nettelroth. 

 Spirifer aiidaciiliis Conrad. 

 Spirifer granulosus Conrad. 

 Strophcodonta pcrplana Conrad. 

 Rhipidomella vanuxcmi Hall. 

 Camarotoechia sappho Hall. 

 Pholidostrophia iozvaensis Owen. 

 ProductcUa spinuUcosta Hall. 

 Platyccras diimosttin Conrad. 



Feet 



Silver Creek hydraulic limestone (cement rock) 20 



Massive fine-grained limestone with hydraulic properties, 

 breaking with subchoncoidal fracture and varying in color 

 from buff on weathered surface to bluish drab when freshly 

 exposed. Chonctcs yandcllana Hall is the most abundant and 

 characteristic fossil. Spirifer granulosus Conrad, S. for- 

 nacula Hall, S. varicosus Hall, Atrypa reticularis (Linnaeus), 

 Tropidolcptus cariuafus Conrad, Strophcodonta concava Hall, 

 ►S*. pcrplana Conrad, and Aviculopcctcn princcps Conrad are 

 more or less abundant. 



Jeffersonville limestone ( Onondaga) 22-30 



Bluish gray to white crystalline limestone, often crowded with 

 fossils. The upper member of this formation is marked by 

 its many fine specimens of Spirifcr acuniinatus Owen. Tliis 

 Spirifcr bed is underlaid by extremely fossiliferous limestone 

 which, when weathered, yields in its cherty debris an abund- 

 ance of exquisitely preserved silicificd specimens of bryozoa 

 and ostracods. Xuclcocriuiis -c'cnicuili and its several varie- 

 ties, or closely related species, are ciiaracteristic of the next 

 lower bed, while species of Strophcodonta are abundant in 

 the next. The large gastropod Turbo shumardi or the abund- 

 ant brachiopod Spirifcr grcgarius are the diagnostic fossils 



