OTHER RESOURCES OF MICHIGAN lUl) 



especially well adapted.^ Small quantities of oil 

 have been discovered in borings in the neighboring 

 territory, but not of economic importance. In the 

 Saginaw Valley, test borings have been made at sev- 

 eral points and some oil obtained thereby, but, while 

 the geological formation is regarded as favorable, 

 a commercial yield of oil has been obtained at widely 

 separated points in Michigan but with meager re- 

 sults. Lenawee County in the southern portion of 

 the Lower Peninsula, and Schoolcraft County in the 

 southern part of the LTpper Peninsula have had oil 

 booms as recently as 1920, but little has been achieved 

 in either territory. In both peninsulas are large 

 formations of oil-bearing shales which may eventually 

 be drawn on for petroleum. Small outputs of oil 

 have been recovered at Allegan, Kalamazoo, Kill- 

 master, Ludington, at East Lake, Stronach, Mt. 

 Pleasant and Osseo. The aggregate product has been 

 quite negligible. 



Eaw material, as marl, limestone, clay and shale, 

 for the manufacture of cement abounds in Michigan. 

 The largest deposits of nearly pure calcium carbonate 

 are in the northern portion of the southern peninsula, 

 and in the eastern part of the northern peninsula, 

 and hence at points more remote from markets and 

 the sources of fuel. According to the Michigan Geo- 

 logical Survey, more than one hundred marl deposits 

 each above fifty acres in extent and with an average 

 depth of at least ten feet have been discovered in 



^Mich. Geol. Survey: "The Occurrence of Oil and Gas in 

 Michigan," Lansing, 1912, 56. 



