Handbook of Paleontology 391 



Oehlertella exilis and Orbiculoidea minuta; the pelecy- 

 pods Panenka equilatera, Aviculopecten eqidlaterus; 

 Leiopteria laevis and Nucidites triqueter; the gastropods 

 Eufysone (Pleurotomaria) rugulata, and (in the Cherry 

 Valley limestone) Euomphalus planodiscus and Loxo- 

 nema hamiltoniae. The cephalopods are most charac- 

 teristic of the Agoniatite (Cherry Valley) limestone, 

 among them Orthoceras marcellense, Gomphoceras (Po- 

 ter'wceras) oviforme, Nautilus (Discites) marc ell ensis, 

 Agonmtites expansus, Anarcestes plebeiformis, and Paro- 

 diceras discoideum. 



The Skaneateles formation (Vanuxem MO) now in- 

 cludes the Stafford limestone, Cardiff shale 1 and Skanea- 

 teles shale. The Stafford limestone (Bishop '97) has 

 recently been proved to be the equivalent of the Mott- 

 ville limestone (Smith '16) of central New York which 

 is considered the basal member of the Skaneateles shale. 

 The Stafford has a thickness of about three feet in 

 western New York and extends from Erie county to 

 Flint creek in Ontario county and is recognized by its 

 fossils as far east as Cayuga county. The name was 

 given from exposures at Stafford, Genesee county. 

 Though the limestone is not thick it carries a very abund- 

 ant fauna of brachiopods {Chonetes scitulus, Stropheo- 

 donta inequistriata, Strophalosia truncata, Camarotoechia 

 sap p ho, Meristella barrisi, Rhipidomella vanuxemi, 

 Spirifer audaculus) , pelecypods {Leiopteria laevis, Lep- 

 todesma marcellense, Panenka equilateral, gastropods 

 (Euryzone [Pleurotoma] itys, E. Incina, Bembexia sul- 

 comarginata, Diaphorostoma lineatum, Bellerophon lyra, 

 Loxonema hamiltoniae), cephalopods (Geisonoceras 

 subulatum, Spyroceras nuntium, Kionoceras staff ordense, 

 Tornoceras uniangulare) , and trilobites (Phacops rana 



1 Only the supposed Cardiff shale of western New York above 

 the Stafford limestone belongs here (see page 390). 



