Handbook of Paleontology 247 



Lower and Middle Cambrian Fossils Lower Ozarkian Fossils 1 



BRACHIOPODS BRACHIOPODS 



Obolella crassa (Georgian) Lingulepis acuminata (Pots- 



Obolella gemma (Georgian) dam, Theresa, Hoyt) 



GASTROPODS GASTROPODS 



Stenotheca rugosa (Georgian) Matherella saratogensis (Hoyt) 



(Probably a pteropod or heteropod) Palaeacmea typica (Potsdam) 



conularids Pelagiella hoyti (Hoyt) 



Hyolithes americanus (Middle Cam- Tnblidium cornuttforme(Hoyt) 



brian) 

 Hyolithes communis (Georgian) 



TRILOBITES TRILOBITES 



Atops trilineata (Georgian) Plethopeltis (Agraulos) sarato- 



Mesonacis asaphoides (Georgian) gensis (Hoyt) 



Microdiscus speciosus (Georgian) Tellerina (Dicellocephalus) 

 Olenoides fordi (Georgian) hartti (Hoyt) 



Olenellus thompsoni (Georgian) Saratogia (Lonchocephalus) 



calcifera (Hoyt) 

 PHYLLOPODS 



Fordilla (Aristozoe?) troyensis 

 (Georgian) 



1 Most of the listed Ozarkian fossils (and others) occur also in the Lower 

 Ozarkian formations in Wisconsin and Michigan. 



Literature. For the general discussion of the Cam- 

 brian and Ozarkian, the student (as in the chapter on 

 the Precambrian eras) is referred to the textbooks of 

 geology by Chamberlin and Mac Clintock ('30), Cham- 

 berlin and Salisbury ('09, '30), Cleland ('16, '30), Cole- 

 man and Parks ('22), Grabau ('20), Schuchert ('24), 

 Scott ('24), and to Schuchert and LeVene ('27). For 

 climates, besides the textbooks, may be added Schu- 

 chert ('14). Books of a technical nature dealing with 

 the Paleozoic in general are Schuchert ('10) and Ul- 

 rich ('11). Many references to Cambrian literature, 

 but of a technical nature, will be found under Walcott 

 in the Bibliography of North American Geology, pub- 

 lished annually by the United States Geological Sur- 



