HISTORICAL SKETCH. XX1 
Orthis polygramna? (Murch. Sil. Sys., pl. XXt, fig. 4). 
Orthis, (three new species). 
Stenoscisma, resembling Terebratula schotthetmii, (Dalman). 
Atrypa, (new species). 
Pleurotomaria, (new species—numerous). 
EHuomphalus, allied to Maclurites magna, (Des.) 
Huomphalus, resembling H. sculptus, (Sowerby). 
Phragmolites, same as the Trenton limestone, N. Y. 
Phragmolites, (new species). 
Bellerophon bilobatus. 
Orthoceras, (two species, undetermined). 
Crinoidal remains of peculiar forms; one resembling Lipocrinites. 
Turbinolopsis bina? (Silur. Syst., pl. Xvi bis, fig. 5). 
Favosites lycoperdon, (Say). Trenton limestone fossil, 
Favosites, (two new species). 
Fucoides, (obscure). 
Cyathophyllum ceratites? 
Turritella. 
G. W. Featherstonhaugh. 
1847. A Canoe Voyage up the Minnay Sotor, with an account of the lead and copper 
deposits of Wisconsin, etc. G. W. FEATHERSTONHAUGH, two volumes, London. 1847. 
There is very little geology in these volumes. At Fort Snelling he ‘‘cursorily examined 
the limestone beds superincumbent upon the soft sandstone, in which were a great variety 
of fossils, such as orthocera, bellerophon, fucoides, orthis, and other fossils characteristic of 
some upper beds of some Silurian limestones.” Vol. 1, p. 258. 
D. D. Owen. 
1848. Report of a geological reconnaissance of the Chippewa Land District of Wisconsin, 
and incidentally of a portion of the Kickapoo country, and of a part of Iowa and of the Minne- 
sota Territory; made wnder instructions from the United States Treasury Department, by 
Davip DAL& Owen, M. D., U. S. Geologist for Wisconsin. Dated April 23, 1848. New 
Harmony, Ind. 
This is one of the progress reports of the survey which subsequently was reported 
fully in 1852, and much of its contents and nearly all of its maps and other illustrations 
are included in the later volume. It also embraces a report by Dr. J. G. Norwood on the 
lower waters of the St. Louis valley, and on the country between Fond du lac and the 
falls of St. Anthony. 
In an appendix are lists of fossils found in the formations at various points, viz., in 
the ‘lower fossiliferous limestone at St. Peter’s and Fort Snelling, which are identical with 
those occuring in the blue limestone of the Ohio valley;” ‘‘near the Big Spring on the 
Upper Iowa river,” and ‘in the limestones (F. 3) of Turkey river, near the agency and 
vicinity.” These, however, are classified and further reported in the final report, noted 
below. 
He does not mention definitely the probable age of the limestone at the falls of St. 
Anthony, but under the designations ‘‘Formation 3,” which Shumard divides into For. 3a, 
For. 8b and For. 3c, and ‘‘St. Peter shell limestone,” he states that the abundant organic 
remains embrace some species found in the inferior beds of the upper magnesian (7. e., 
