XXX11 THE PALEONTOLOGY OF MINNESOTA. 



Tellinomya ventricosa, n. sp. Trenton limestone. 

 Tellinomya ovata, n. sp. Trenton limestone. 

 Cypricardites rotunda, n. sp. Trenton (Buff) limestone. 

 Cypricardites niota, n. sp. Trenton (Buff) limestone. 

 Cypricardites rectirostra, n. sp. Trenton (Buff) limestone. 

 Modiolopsis planus, n. sp. Trenton (Buff) limestone. 

 Modiolopsis? superbus. n. sp. Trenton (Bluff) limestone. 

 Ambonychia lamellosa, n. sp. Trenton limestone. 

 Ambonychia planistriata, n. sp. Trenton limestone. 

 Ambonychia erecta, n. sp. Trenton limestone. 

 Ambonychia attenuata, n. sp. Trenton (Buff) limestone. 

 Pleurotomaria niota, n. sp. Trenton (Buff) limestone. 

 Pleurotomaria nasoni n. sp. Trenton (Buff) limestone. 

 Pleurotomaria semele, n. sp. Shales above Galena limestone. 

 Maclurea bigsbyi, n. sp. Trenton (Buff) limestone. 

 Ecculiomphalus undulatus, n. sp. Trenton (Buff) limestone. 

 Lituites undatus var., occidentalis n. sp. Trenton (Buff) limestone. 

 Lituites robertsoni, n. sp. Trenton (Buff) limestone. 

 Cyrtoceras whitneyi, n. sp. Shales above Galena limestone. 

 Cyrtoceras neleum, n. sp. Trenton (Buff) limestone. 

 Cyrtoceras engium, n. sp. Trenton (Buff) limestone. 

 Crytoeeras loculosum, n. sp. Trenton limestone. 

 Onoceras abruptum, n. sp. Trenton limestone. 

 Onoceras plebeium, n. sp. Trenton (Buff) limestone. 

 Onoceras pandion, n.sp. Trenton (Buff) limestone. 

 Onoceras lycum, n. sp. Trenton (Buff) limestone. 

 Onoceras alceum, n. sp. Trenton (Buff) limestone. 

 Orthoceras gregarium, n. sp. Shales above Galena limestone. 

 Orthoceras planoconvexum, n. sp. Trenton (Buff) limestone. 

 Gonioceras occidentalis, n. sp. Trenton limestone. 

 Illcenus taurus, n. sp. Trenton (Buff) limestone. 

 Calymene mammilata, n. sp.Shales above Galena limestone. 



G. L. Anderson and Thomas Clark. 



1861. Report on Geology and a plan for a Geological Survey. By ANDERSON and 

 CLARK; addressed to the Legislature of Minnesota, Jan. 25, 1861. In this report Mr. 

 Anderson follows Dr. Owen, denominating the limstones at St. Paul, and the falls of St. 

 Anthony, "Shell or Blue limestone." 



"Its distinguishing fossil is Leptena, some fifteen species of which occur in it. Orthoceratites are 

 exceedingly common, and the species numerous. Some of them are of enormous size, measuring nine or 

 ten feet in length." 



He remarks that the line distinguishing this from the "Upper Magnesian limestone" 

 is difficult to find, and that Dr. Owen classed them together. We have seen, on the con- 

 trary, that Dr. Owen, in his final report, considered the Upper Magnesian limestone, or the 

 the lead-bearing portion of it to which the the term was latterly confined, as the equivalent 

 of the Utica slate and the Hudson River group, and that he parallelized the "Shell or 

 Blue limestone " with the Trenton. 



As to the Galena limestone, these authors are inclined to consider it almost if not 

 entirely wanting in Minnesota, but suggest that it may exist in some of the high bluffs in 

 the middle southern counties. 



James Hall. 



1862. Report on the Geological Survey of the State of Wisconsin, Vol. i, 4to, 1892. 

 JAMES HALL and J. D. WHITNEY. By authority of the Legislature of Wisconsin. 



