Notes on a Collection of Fossils. 1S9 



7. YelJoxo shah beds, containing a peculiar and easily recog- 

 nized assemblage of fossils described in the present 

 paper and in the . American Geologist for Sept., 1S91. 



The jyeii'berria johannis H., which in a former paper was 

 thought to occupy a distinct series of beds, was found at the 

 summit of the horizon characterized by a yl. ■profunda. The 

 relations of the beds containing the undetermined species of 

 JVewherria near Fairbank, are yet undetermined. The Niag- 

 ara uplift near Fairbank is a fact new to Iowa geology, and 

 its full effects in deflectincr the resfular trend of Devonian out- 

 crop and modif3'ing the regular succession of Devonian strata 

 have yet to be ascertained. 



NOTES OX A COLLECTION OF FOSSILS FROM THE LOWER 

 MAG.\ESiAN LIMESTOXE FROM iMTHEASTERX, MA. 



By S. CALVIX, 



Until recently we have been accustomed to regard the 

 Lower Magnesian Limestone of the Upper J.'Iississippi Valley 

 as destitute of organic remains. Dr. White in his report on 

 the Geology of Iowa, Vol. I, pp. 173-174, says that "the 

 only fossils that have been found in this formation in Iowa 

 are, so far as known, a few traces of the stems of Crinoids 

 found near McGregor." Whitney in Hall's Geology of Iowa, 

 P- 33 7? speaking of indications of organic Hfe in the Lower 

 Magnesian Limestone, says that "in Iowa, indeed, we have 

 observed nothing of the kind." Owen seems to have been 

 more fortunate than the other observers mentioned, for in his 

 report on the Geol. Survey of Wis., Iowa and Minn., p. 60, 

 he enumerates a few genera that are represented in this for- 



