718 



PROCEEDINGS OF THE OTTAAVA MEETING! 



yet forming no beaches, or that the land tilting was much more rapid during 

 that time than during the later time. 



Professor Woodvvorth concludes that the highest marine level is shown at 

 Covey Hill, on the northern boundary of the state, at 450 feet altitude. This 

 is quite definite, as the higher slopes show only the earlier work of streams 

 carrying the sub-Iroquois waters. In 1882 a whale skeleton was found in a 

 gravel pit at Welchs siding, north of Smiths Falls, in Ontario, and about 30 

 miles northwest of Ogdensburg. The altitude of the gravels has been given as 

 440 feet,* and Taylor has told the writer that he estimated the possible upper 

 limit of marine work as about 460 feet. The latter point is only a few miles 

 south of the parallel of Covey Hill, and the altitudes indicate, what has already 

 been inferred from Iroquois and other lake levels in New York, that the iso- 

 basal lines in this region trend north of east and south of west. 



Welchs siding is 48 miles from the "hogback" hill and in direct continuation 

 of the line from the Texas spit. The uplift between the "hogback" and Welchs, 

 according to the above data, is 1.25 feet per mile. Making all possible allowance 

 for the uncertainty in the figures for the water levels, it seems certain that 

 the rate of uplift diminishes north of Clayton. The deformation of the eastern 

 Ontario region seems to be an irregular warping, with the steepest slopes east 

 of the present lake. 



The paper was discussed by H. M. Ami, W. M. Davis, 0. C. Lane, J. F. 

 Kemp, and the author. 



DISCOVERY OF THE SCHOHARIE FAUNA IN MICHIGAN 

 BY A. W. GBABATJ 



[Abstract] 



During the past season's field work a typical Schoharie fauna was discovered 

 in northern lower Michigan. The locality is at Mill creek, 4 miles east of 

 Mackinac city. The outcrops on the stream are more or less continuous 

 from a short distance south of the mouth of the stream to the top of the 

 terrace along the base of which runs the highway. The lower beds are mag- 

 nesian calcilutytes, followed by calcarenytes in which the fauna occurs. Two 

 analyses of the rock from different points show : 



1. CaC0 3 56.12 MgC0 3 41.65 



2. CaCO s 69.16 MgC0 8 27.94 



Some of the lowest beds exposed run, however, as high as 94.69 per cent 

 CaCO a and 2.93 per cent MgC0 3 . 



The outcrops containing the Schoharie fauna are all near the Michigan 

 Central railroad crossing. The fossils, while not well preserved, on the whole 

 are nevertheless characteristic. 



The following ten species were obtained : 



Trochoceras clio; range, Schoharie. 



Atrypa impressa; range, Schoharie. 



* A. P. Coleman : Marine and fresh-water beaches in Ontario. Bull. Geol. Soc. Am., 

 vol. 12, p. 133. 



