ROCHESTER AND ONTARIO BEACH QUADRANGLES 



19 



Enterolasma caliculus Hall 

 Favosites constrictus Hall 

 Cladopora seriata Hall 

 Chilotrypa ostiolata Hall 

 Subretepora dichotoma Hall 

 Fenestella elegans Hall 

 Semicoscinium tenuiceps Hall 

 Polypora incepta Hall 

 Sagenella membranacea Hall 

 Dictyonema retiforme Hall 

 Inocaulis plumulosus Hall 

 Eucalyptocrinus decorus Phillips 

 Caryocrinus ornatus Say 

 Lingula lamellata Hall , 

 Pholidops squamiformis Hall 

 Dalmanella elegantula Dahnan 

 Rhipidomella hybrida Sowerby 

 Orthis flabellites Hall 

 Orthostrophia fasciata Hall 



S. crisp us Hi singer 

 S. niagarensis Conrad 

 S. radiatus Sowerby 

 Whittieldella nitida Hall 

 Atrypa reticularis Linne 

 Camarotoechia neglecta Hall 

 Dictyonella corallifera Hall 

 Pterinea emacerata Conrad 

 P. undata Hall 



Lyriopecten (?) orbiculatus Hall 

 Diaphorostoma niagarense Hall 

 Gomphoceras sp. 

 Orthoceras imbricatum Sowerby 

 O. virgatum Sowerby 

 O. annulatum Sowerby 

 Cyrtoceras subcancellatum Hall 

 Conularia niagarensis Hall 

 Calymmene niagarensis Hall 

 Illaenus ioxus Hall 



Plectambonites transversalis ^Frt/^/^«<^^ro- Dalmanites limulurus Green 

 Leptaena rhomboidalis Wahlenberg Ceraurus niagarensis Hall 



Orthothetes subplanus Conrad Homalonotus delphinocephalus Green 



Spirifer sulcatus Hisinger Lichas boltoni Bigsby 



Lockport dolomite. Following the deposition of the Rochester shale 

 and continuing until Salina time, there was laid down a series of 

 magnesian limestones or more properly dolomites. These beds as 

 early as 1838 were described by Hall under the term Lockport 

 limestone. 



In western New York this series of dolomites is characterized by 

 the presence of two distinct faunas, which though subject to 

 variation in species combinations may still be referred to as alter- 

 nating or recurring. 



While similar conditions exist at Rochester, the section which 

 most clearly illustrates these relations is at Shelby in Orleans county. 

 At this locality, Clarke and Ruedemann^ have constructed the follow- 

 ing section: 



N. Y. State Mus. Mem. 5. 1903. p. 



