102 



Gastropods — ■ 



Conularia trentonensis {Hall). Abundant. 

 Cyclonema sp. 



Fusispira notabilis Ulrich. Rare. . 

 Fusispira sulcata Ulrich. Rare. 

 Hormotoma bellicincta (Hall). Rare. 

 Hormotoma gracilis (Hall). Rare 

 Hormotoma trentonensis Ulrich. Abundant. 

 Liospira angustata Ulrich. Rare. 

 Protowarthia cancellata (Hall). Rare. 



Pelecypods — 



Ambonychia sp. 



Vanuxemia obtusifrons Ulrich. Abundant. 

 Cephalopods — 



Orthoceras sp. 

 Trilobites — 



Bronteus sp. 



Calymmene callicephala Green. Common 



Ceraurus pleurexanthemus Green. Fairly com- 

 mon. 



Isotelus gigas Dekay. 



Collingwood formation. — Resting directly on the Tren- 

 ton^ limestones is a series of thin bedded limestones and 

 dark bituminous shales, which is characterized more 

 particularly by the presence of Ogygites canadensis, (Chap- 

 man). Raymond considers that this series of limestones 

 and shales lies below the typical Utica of New York and 

 has proposed the name "Collingwood" for the formation. 

 The chief fossils are as follows: — ■ 



Graptolites — 



Climacograptus bicornis (Hall). 

 Brachiopods — 



Dalmanella testudinaria (Dalman). 



Lingula cobourgensis Billings. 



Lingula modesta Ulrich. 



Lingula progne Billings. 



Rafinesquina alternata (Emmons) . 



Rafinesquina deltoidea ((Conrad). 



Rafinesquina minnesotaensis (Winchell) 



Zygospira modesta (Hall). 



Conularia trentonensis Hall. 



