DescriptionLucas Dolomite (Middle Devonian; Auglaize Quarry, near Junction, Ohio, USA) 5 (48904937882).jpg
This is part of a large, loose block at an active quarry in far-northwestern Ohio. We were forbidden from closely approaching the walls. Rock piles on the quarry floor were available for close examination and mineral collecting.
This rock is from the Lucas Dolomite of the Detroit River Group. The Lucas appears to consist of both dolostone and limestone. Finely-laminated, brown dolostone is a common lithology in this unit (see the upper half of the photo). Lack of stratigraphic control in the loose quarry blocks makes additional, specific lithologic assessments difficult. Stylolites are also present in the Lucas.
The finely laminated portions of the Lucas have been identified by other workers as microbial mats.
The mottled-gray, poorly-stratified portion of the block (= lower half of the photo) appears to be mostly carbonate breccia.
Stratigraphy: Lucas Dolomite, upper Detroit River Group, Middle Devonian
Locality: Auglaize Quarry (= Shelly Company, Stoneco's Auglaize Facility), southeast of the town of Junction, northeastern Paulding County, northwestern Ohio, USA (41° 10' 27.83" North latitude, 84° 25' 19.75" West longitude)
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