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Middle Devonian |
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Middle Devonian [′mid·əl di′vō·nē·ən] (geology) The geologic epoch occurring between the Upper and Lower Devonian, beginning approximately 385,000,000 years ago. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In southwesternmost Indiana (Posey County), the New Harmony is probably conformable with Silurian rocks below and Middle Devonian (Jeffersonville Limestone) rocks above. The dominant host rock within the deformed assemblage is the Lower to Middle Devonian diorite. The target, located at a depth of 3,500 feet, in the Middle Devonian Simonson Formation has been known for several major producing fields including Blackburn and Grant Canyon. |
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