The Geological Survey Division of the Michigan department of natural resources has authorized the release of information from the core, logs and records of the state’s deepest, all-cored drill hole.
This hole, permitted under Michigan’s “Mineral Well Act”, was eligible for a 10-year confidential status. The information now being made public is expected to aid in understanding the geology of the state and surrounding area.
AMOCO released the confidentiality on the core, well logs and file data for its St. Amour 1-29 and 1-29R test holes.
The 1-29R is a 7,238-ft. hole that was drilled in late 1987 to learn more about the mid-continent rift. It was located southeast of Munising, near Wetmore, in Alger County.
The hole went through 110 ft. of glacial drift and entered bedrock in the Paleozoic-aged Autrain Formation (Prairie du Chien and Trempealeau) of Ordovician time. The hole ended in Precambrian-aged Portage Lake volcanics of Keweenawan time. This core should be of interest to geologists from academia, the oil and gas industry, and the mineral exploration industry.
The St. Amour 1-29R drill core is part of the statewide collection of core, cuttings and samples maintained at the Geological Survey’s geological core and sample repository near Marquette. The repository is open to visitors by appointment. For information, call (906) 228-6561.
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