Excerpt from Omaha Pool and Mica-Periodotite Intrusives, Gallatin County, Illinois The pool is on the crest of a large dome and is exceptional in that igneous rock is found in intrusive contact with the producing sands. Sills and dikes ranging from less than one foot to 50 feet in thickness, composed of mica-peridotite, occur at many levels in the Pennsylvanian and Chester series. Contact effects indicate that some oil was in the sands before intrusion Of the igneous mate rial, suggesting a certain amount Of prior uplift. ...
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Excerpt from Omaha Pool and Mica-Periodotite Intrusives, Gallatin County, Illinois The pool is on the crest of a large dome and is exceptional in that igneous rock is found in intrusive contact with the producing sands. Sills and dikes ranging from less than one foot to 50 feet in thickness, composed of mica-peridotite, occur at many levels in the Pennsylvanian and Chester series. Contact effects indicate that some oil was in the sands before intrusion Of the igneous mate rial, suggesting a certain amount Of prior uplift. The pronounced doming Of the structure and the intrusion Of dikes and Sills may have accompanied intrusion Of a hypothetical subjacent laccolithic or stock-like igneous body, probably in post-pennsylvanian - pre-cretaceous time. Minor folding occurred earlier at the close of the Mississippian period. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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