xx THE PALEONTOLOGY OF MINNESOTA. 



upper portion of Wisconsin, reaches the state of Michigan." On p. 68 a section along the 

 Mississippi from Fort Snelling to the falls of St. Anthony is given as follows : 



1. "Fine grained unstratifled sandstone." 2. "A compact sub-lamellar limestone of variable 

 colors, as fawn, yellowish-buff, or grayish. It contains many fossils, but very irregularly distributed in 

 the mass. This bed is from 8 to 12 feet thick, weathering into layers of from two inches to a foot thick." 

 I). "Drift." 



A list of a few of the fossils found in the mineral region of Wisconsin (p. 168) is 

 given and also a list of those found at Port Snelling and the falls of St. Anthony (p. 169). 



These lists are given below in full. In the determination of the fossils Nicollet was 

 assisted by Mr. T. A. Conrad, and he gives his idea of the stratigrahic position of the 

 fossil -bearing strata at Ft. Snelling in the following words: 



"I may remark here, that it will be seen that this list of fossils embraces a few species of the Tren- 

 ton limestone, as described by the New York geologists; whence we might infer that the group of St. 

 Peter's characterizes a rock of the same age as that which contains the lead at Galena, and which may 

 probably be an upper portion of the Trenton limestone, newer than any part of that formation hitherto 

 observed in the state of New York." (p. 70.) 



This seems to be the first correct assignment of the rocks at the falls of St. Anthony 

 to the horizon of the New York Trenton. 



MINERAL REGION OF WISCONSIN TERRITORY GALENA AND ITS VICINITY. 



Blue limestone. (Trenton of Dr. Owen and Dr. Locke.) 



Trilobites: 



Illcenus, (new) 



Asaphus, (new.) 



Ceraurus pleurexanthemus, (Green.) 



Portion of an Isotelus gigas. 



Trenton limestone of New York, corresponding with the 

 lower part of the Caradoc, perhaps still lower. 



Calymene spinifera, (Conrad.) 



Shells: 



Strophomena, (new.) 



Strophomena sericea, (Sowerby.) 



Strophomena alternata, (?) ) 



Orthis alternata, (f) \ Same of the Tr enton limestone, New York. 



Orthis callactis. 



Cypricardites, (new.) 



Trochus lenticularis, (Sowerby.) Murch. Sii. Syst. 



Pleurotomaria. 



Bellerophon bilobatus. 



Orthoceras, (one species, large.) 



Cliff limestone. (Supposed by Drs. Owen and Locke to include the lead bearing rocks.) 



Illcenus, (new.) Same species as in the Trenton limestone. 

 Strophomena deltoidea. 

 Atrypa, (new species). 



Lingula, (new). Same with a Trenton limestone species. 

 Euomphalus, (new). 

 Orthoceras; fragment, (undetermined). 

 Corals: 



Gyathopyllum ceratites (?). 

 Turbinolopsis, (new). 

 Favosites, (new). 

 Portion of an Asterea. 



ST. PETER'S* AND FALLS OF ST. ANTHONY. 



Strophomena, allied to S. alternata. 



Strophomena, (new species). 



Orthis testudinaria? (Murch. Sil. Sys., pi. xx, fig. 10). 



'Fort Snelling. 



