112 Crefaceovs. 



Prof. E. D. Cope* described, from Solomon river, Kansas, Portlieus 

 gladius^ now Pelecopterus qladius^ and Portheuslestrio. 



Prof. O. C. Marslif described, from Kansas, Apatomis ceier. 



Dr. Joseph LeidyJ described, from Smoky Hill river, Kansas, Cli- 

 dastes affinis; and from Columbus, Mississippi, Eumylodus' 

 laqueatus. 



Mr. James Ricliardson§ separated the Cretaceous rocks of Vancou- 

 ver Island into seven divisions in ascending order as follows: 



A. Productive coal measures. 



B. Lower shales.. 



C. Lower conglomerate, ' 



D. Middle shales. 



E. Middle conglomerate. 



F. Upper shales. 



G. Upper conglomerate. 



A section of division A., on Brown's river, is shown to be 739^ feet 

 thick. Division B., on Sable river and Dennian Island, 1,000 feet. 

 Division C, on Denman and Hornby Islands, between 900 and 1,000 

 feet. Division D, on Hornby Island, 70 feet. Division E., on Hornby 

 Island, from 1,100 to 1,200 feet. Division F., near Tribune Bay, 776A 

 feet. And Division G,, on Tribune Bay, 320 feet. Making a total 

 thickness of 5,000 feet. 



Dr. Dawson II described, from the Lower Cretaceous of Queen 

 Charlotte Islands, Cycadeocarpus columbiamis. 



In 1874, Dr. F. V. Hayden^ said, that to one who has carefully stud- 

 ied the divisions along the Missouri river, the Cretaceous beds in Colo- 

 rado and New Mexico, ma\" be separated into five groups, without 

 much difflcult3^ The Dakota group is well shown and is alwa3's char- 

 acteristic, though seldom containing any organic remains. The Niobrara 

 group is represented by a thin bed of impure gray limestone, and thin 

 calcareous shale, with Osfrea congesta and a species of. Inoceramas. The 

 fossils are about the same as those occurring on the Missouri, but the 

 rocks have little of the chalky texture, as observed in the northwest 

 and in Kansas. The Fort Benton and Fort Pierre groups are black 

 shaly clays, and do not differ materially from the same groups occuiT- 



* Pi-oc. Acad. Nat. Sei. 



t Am. Jour. Sci. and Arts, 3d series, vol. 5. 



i Cont. to Extinct V'ert. Fauna. "W. Terr. 



g Geo. Sur. Can. 



I Geo. Sur. Can. 



If Ann. Rep. U. S. Geo. Sur. Terr. 



