THE PALEONTOLOGY OF MINNESOTA. 



also that the main trend of the Cincinnati anticlinal is northwestward, instead of north- 

 ward past the west end of lake Erie. 



Jos. F. James. 



1890. On the Maquoketa shales, and their correlation ivith the Cincinnati group of 

 southwestern Ohio, by JOSEPH F. JAMES, American Geologist, vol. v, p, 335, June, 1890, 



After reference to previous literature Mr. James gives detailed sections at Graf, Iowa, 

 covering 31 feet of the Maquoketa shales. He states that the top of the Galena is considera- 

 bly eroded, showing an unconformity between it and the Maquoketa. He shows a continua- 

 tion of the Cincinnati formation from southern Indiana to northwestern Illinois, by an ex- 

 amination of the records of gas wells through the state of Indiana, and by descriptions of 

 outcrops published in the Illinois reports. He gives a list of Maquoketa fossils and a table 

 showing their geographic distribution and their strong affinity with the fauna of the Cin- 

 cinnati. With a reference to the identity of lithologic characters he concludes that the 

 Maquoketa shales are an exact representation, except in being reduced in thickness, of 

 the Cincinnati group of Ohio, and that the term Maquoketa ought be dropped from geolo- 

 gical literature. 



J. F. Whiteaves. 



1891. The Orthoceratidce of the Trenton limestone of the Winnipeg basin, by J. F. 

 WHITEAVES. Trans. Roy. Soc., Canada, vol. ix, 1891. Sec. iv, p. 77. Seven plates. 



This paper consists of a critical study and systematic list of the Trenton Orthocer- 

 atidse of the Winnipeg region that term being taken in a somewhat comprehensive 

 sense to include all those highly fossiliferous deposits which immediately and conformably 

 overlie the St. Peter sandstone and underlie the Hudson River formation. It names three 

 species of Endoceras, of which End. crassisiphonatum is new; four of Orthoceras, of 

 which O. semiplanatum, selkirkense and winnipegense are new; three of Actinoceras; one 

 of Sactoceras, viz., canadense (new); one of Gonioceras, viz., lambii (new); and three of 

 Poterioceras, of which P. gracile is new. 



F. W. Sardeson. 



1892. Fossils from the St. Peter sandstone. Read Feb. 3, 1891. The Lower Silurian 

 formations of Wisconsin and Minnesota compared. Read Oct. 6, 1891. The range and dis- 

 tribution of the Lower Silurian fauna of Minnesota, with descriptions of some new species. 

 Read Dec. 8, 1891. 



The foregoing papers by Mr. F. W. Sardeson, were issued in a single brochure and 

 distributed April 9, 1892, accompanied by plates iv, v and vi. They were read before the 

 Minnesota Academy of Natural Sciences. The first announces an important discovery of 

 lamellibranchs and gasteropods in the St. Peter sandstone at cuts along the Chicago, Bur- 

 lington & Northern R. R., about five miles below St. Paul, about 50 feet below the Tren- 

 ton. These are said to be remarkably like species found in the Trenton above, and 

 thought to indicate that the St. Peter should be classed with the Lower Silurian. 



