594 REVIEWS 



MICHIGAN. 



Gordon, C. H. The Port Hiiron Oil Field. Report of State Geologist 

 for 1901, pp. 269-82, 1902. 



The thickness and character of the glacial deposits are given in connection with 

 the well records, and attention is called to water supply from the gravel beds. 



Gordon, C. H. Wave Cutting on the West Shore of Lake Huron in Sanilac 



County, Mich, Report of State Geologist for 1901, pp. 583-290, Figs. 



6-8, Pis. XI-XV, 1902. 



The amount of encroachment on the land from 1823 (when the government land 

 survey was made) to 1901 was accurately surveyed on part of the shore, and found to 

 average 6. 8 1 chains, or 449.46 feet, an average of 5.7 feet per annum. Were the rate 

 of cutting and transfer of material to the lake bed uniform for the entire 500 miles of 

 coast, it would require 4,000 years to fill the lake one foot, and 800,000 years to fill 

 the 200 feet of average depth. The rate of cutting here is thought, however, to be 

 above the average, and the time required to fill the lake by this process is likely to be 

 much longer than 800,000 years. The paper is well illustrated by maps and photo- 

 graphs of the shore. 

 Gregory, W. M. Preliminary Report 071 Arenac County, and Parts of 



Ogemaw, Iosco, and Alcona Counties. Rept. of State Geologist for 



1901, pp. 9-29, 1902. 



The report aims to bring to notice economic resources: limestone, gypsum, coal, 

 clay and shales, water supply (especially flowing wells), and agricultural values. The 

 glacial deposits and shores of glacial lakes receive very brief treatment. 



The flowing wells are partly from gravel below till on the lakeward slopes of 

 moraines, but many are extended into the rock. 



Lane, A. C. The Preglacial Surface of Lower Michigan. Science, Vol. 

 XIV, pp. 798, 799, 1901. 



Rock outcrops in Saginaw Bay seem to oppose the interpretation made by Spencer 

 that the central part of the southern peninsula drained through the bay. The borings 

 favor the view that drainage was westward or northwestward. The available data are 

 thought to indicate that the drainage from the Grand Traverse region was southward 

 past Manistee, rather than northward toward the Straits of Mackinac. 

 Lane, A. C. Deep Wells, etc. Rept. of State Geologist for 1901, pp. 21 1-38, 

 1902. 



The records of deep wells in southeastern Michigan, in the Port Huron district, in 

 the northern part of the state, and on the Lake Michigan shore which are here 

 presented, throw light upon the thickness and structure of the glacial deposits. 

 Leverett, Frank. Surface Geology of Alco7ia County, Michigan. Rept. 

 of State Geologist for 1901, pp. 35-64, 1902. 



The physiography, glacial deposits, lake history, soils, wells, marl and clay 

 deposits, and water power form the chief topics of discussion. Rocks included in the 

 drift of this county bear witness to several ice movements, some having been brought 

 from the northwest, others from the northeast, and still others from the southeast. The 

 ice -sheet apparently persisted in the low tracts in the eastern part of the county until 

 Lake Warren had been drained away, for no well-defined beach was found above the 

 Algonquin. 



