Publisher's Synopsis
Excerpt from The Monroe Formation of Southern Michigan and Adjoining Regions
While this work was being prosecuted in Michigan and Ohio, similar reconnaissance work was being done in Indiana by Dr. D. D. Owen, his first report being published in 1838 and the second in 1839. The latter volume contains a summary of, the geology of the state (p. 39) in which are given the approximate limits of the bituminous coal formation, and the remaining rocks of the state are referred to the sub-carboniferous, which was said to correspond, in some respects to the mountain limestones of European geole gists. The financial depression of the late 3o's brought the geologi cal work to a standstill in Michigan, Ohio and Indiana, and for the two decades there was practically no systematic work attempted in this region.
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