348 HALL AND SARDESON PALEOZOIC FORMATIONS OF MINNESOTA. 



Below arc given some analyses of these dolomites. A large part of 

 them have been made in the chemical laboratory of the university of 



Minnesota. Those starred (*) were made especially for this paper. 



I. Compact dolomite, Dresbach : analyzed by C S. Chappie. 

 II. Compact dolomite. Nininger; analyzed by Mary E. Bassett. 

 IH. Iiol. .mite, bottom layer quarried at Mankato; analyzed by C. L. Herron. 

 IV. Dolomite, buff-colored Kasota -ton.'. Kasota; analyzed by H. C. Carel. 

 V. Dolomite (porous), Frontenac; analyzed by J. G. Cross and E. I'. Sheldon. 

 VI. Dolomite, Ottawa: analyzed by Professor .1. A. Dodge. ^ 

 VII. Dolomite (eemenl rock), Mankato; analyzed by Professor C. F. Sidener. 

 VIII. Cement manufactured from Mankato cement stone; analyzed by Professor I '. F. Sidener. 

 IX. Dolomite; reported by 1'.. F. Shumard, Owen's Geo! Wis.. la. and Minn., p. 484. 

 X. Dolomite, lake St. Croix, below Stillwater; reported l.y B. F. Shumard, Owen's Geol. Wis., 

 la. and Minn . p. .'.'.'. 

 XI. Dolomite, Gray Cloud island; reported by B. F. Shumard, Owen's Geol. Wis., la. and Minn., 



p 59. 

 XII. Dolomite, section 20, Lime ; analyzed l.y Professor J. A. Hodge. 



XIII. Dolomite, quarry of Maxwell and Mather. Mankato: analyzed l.y Professor J. A. Dodge. 



XIV. Dolomite, "eemenl rock," Mankato; analyzed by W. C. Smith. 



Paleontohgic Characters. — The fauna of the Magnesian in Minnesota, so 

 far as reported, is very meager. This is due in part to the imperfect 

 manner in which fossils are preserved and in part to the fact that sys- 

 tematic search in these unpromising beds has rarely been attempted. 

 However, specimens from this series have been incidentally found by the 

 authors and by others; and it seems probable that a large fauna could 



♦ "Alumina, oxide of iron and manganese." 

 t" Insoluble matter." 

 j " Water and loss." 



