xXx 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 unstratified sandstone.” 2. ‘‘A compact sub-lamellar limestone of variable 
colors, as fawn, yellowish—-buff, or grayish. I1t 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.” 
oe eDrifty? 
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 Fort 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 stratigrahie position of the 
fossil-bearing strata at Ft. Snelling in the following words:— 
“JT may remark here, that it will be seen that this list of fossils embraces a few species of the Tren- 
tun 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 :— 
Illenus, (new) 
Asaphus, (new.) 
Ceraurus pleurexanthemus, (Green.) 
Portion of an Isotelus gigas. 
Calymene spinifera, (Conrad.) 
Shells:— 
Strophomena, (new.) 
Strophomena sericea, (Sowerby.) 
Strophomena alternata, (?) 
Orthis alternata, (?) 
Orthis callactis. 
Cypricardites, (new.) 
Trochus lenticularis, (Sowerby.) Murch. Sil. Syst. 
Pleurotomaria. 
Bellerophon bilobatus. 
Orthoceras, (one species, large.) 
Trenton limestone of New York, corresponding with the 
lower part of the Caradoc,—perhaps still lower. 
U Same of the Trenton limestone, New York. 
Cliff limestone. (Supposed by Drs. Owen and Locke to include the lead bearing rocks.) 
Illenus, (new.) Same species as in the Trenton limestone. 
Strophomena deltoidea. 
Alrypa, (new species). 
Lingula, (new). Same with a Trenton limestone species. 
Euomphalus, (new). 
Orthoceras; fragment, (undetermined). 
Corals: 
Cyathopyllum ceratites (?). 
Turbinolopsis, (new). 
Favosites, (new). 
Portion of an Asterea. 
St. PETgER’s* AND FALLS OF St. ANTHONY. 
Strophomena, allied to S. alternata. 
Strophomena, (new species). 
Orthis testudinaria? (Murch. Sil. Sys., pl. Xx, fig. 10). 
* Port Snelling. 
