Handbook of Paleontology 409 



orbicularis, Dalmanella leonensis, Productella hirsuta, 

 Choneies scitulus, Orthothetes chemungensis ; pelecypods 

 as Pterinea chemungensis, Pterinopecten sub orbicularis, 

 P. crenico status, Aviculopecten duplicatus, Lyriopecten 

 magnificus, Lunulicardium acutiro strum, Mytilarca che- 

 mungensis, Grammy sia communis, Sphenotus contractus, 

 Leptodesma longispinum; gastropods as Loxonema 

 laxum, Euomphalus tioga, Bellerophon maera; cephalo- 

 pods as Orthoceras expositum, Poterioceras nasutum, 

 Sandbergeroceras chemungense ; crustaceans as Pephri- 

 caris horripilata. Remains of fish as Onychodus hop- 

 kinsi, Dinichthys curtus occur in these beds. Sponges 

 (as Hydnoceras tuberosum and Thysanodictya apleta) 

 are locally abundant. 



The Catskill beds (Mather '40) receive their name 

 from the Catskill mountains and have their greatest de- 

 velopment in Greene county. They consist of sandstone, 

 shales and conglomerates, chiefly red, with a thickness up 

 to 3000 feet in New York State. They are a nonmarine 

 facies of the Upper Devonian and represent in the east 

 the time equivalent of the Chemung beds. In the east 

 they rest upon the Oneonta beds and toward the central 

 part of the State upon the Portage. The red Catskill 

 beds spread westward and replace the marine Chemung 

 beds, continuing into Mississippian time. These beds are 

 characterized by the fresh-water mussel, Archanodon 

 cat skill ensis. Fish remains such as Holoptychius ameri- 

 canus, Bothriolepis leidyi etc. occur, and the eurypterid 

 Stylonurus excelsior came from these beds (Andes, in 

 the Catskills). 



The Rensselaer grit (Dale '93) is an outlying area of 

 grit in Rensselaer county resting unconformably on the 



