HISTORICAL SKETCH. XXI 



Orthis polyyramna? (Murch. Sil. Sys., pi. xxi, flg. 4). 



Orthis, (three new species). 



Stenoscisma, resembling Terebratula schottheimii, (Dalrnan). 



Atrypa, (new species). 



Pleurotomaria, (new species numerous). 



Euomphalus, allied to Maclurites magna, (Des.) 



Euomphalus, resembling E. 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., pi. xvibis, flg. 5). 



Favosites lycoperdon, (Say). Trenton limestone fossil, 



Favosites, (two new species). 



Fucoides, (obscure). 



Cyaihophyllum ceratites? 



Turritella. 



G. W. Feather stonhaugh. 



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 Port 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. i, p. 258. 



D. D. Owen. 



1848. Report of a geological reconnaissance of the Ghippewa Land District of Wisconsin, 

 and incidentally of a portion of the Kickapoo countri/, and of a part of Iowa and of the Minne- 

 sota Territory; made under instructions from the United States Treasury Department, by 

 DAVID DALE 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. 36 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 (i. e., 



