GEOLOGY AND MINERAL RESOURCES OF LARAMIE 
BASIN, WYOMING: A PRELIMINARY REPORT. 
By N. H. Darton and C. L. Siebenthal. 
INTRODUCTION. 
The region to which this report relates (see fig. 1) includes all of 
the area usually designated the Laramie Plains and Laramie Basin, 
or all of Albany County except that part which lies high on the 
FlG. 1.— Map of Wyoming, showing area treated in this report. 
slopes of the Medicine Bow Range. It also includes a small portion 
of the eastern border of Carbon County. 
The investigation, which was made during portions of 1905 and 
1906, was undertaken largely for the purpose of determining the con- 
ditions under which underground waters might be expected; this 
involved a study of the geologic succession and structure. The 
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