File:Eau Claire Formation (Middle to Upper Cambrian; Warren County core, Ohio, USA) 1.jpg
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Summary
| Description |
English: This is part of a continuously-cored section of Cambrian rocks from southwestern Ohio's deep subsurface. The Ohio Geological Survey drilled this core from 1987 to 1989 in northeastern Warren County, Ohio. It was intended to be a stratigraphic reference section from the Upper Ordovician to Precambrian basement rocks. Instead of encountering igneous or metamorphic rocks below the Cambrian sedimentary cover, the core unexpectedly penetrated a thick, late Precambrian-aged sedimentary succession, which has been interpreted as a rift-basin fill. The rift fill sedimentary rocks were a new stratigraphic formation now called the Middle Run Formation.
The rocks seen here are part of the Eau Claire Formation, a heterolithic unit consisting of mixed siliciclastics and carbonate rocks. The dark gray rocks seen above are shales. In eastern Ohio's subsurface, this shale-rich interval is known as the Conasauga Formation. Trilobite fossils have been retrieved from the Eau Claire Formation in the Warren County core - they allow biostratigraphic dating to the late Middle Cambrian-early Late Cambrian. Stratigraphy: Eau Claire Formation, upper Middle Cambrian to lower Upper Cambrian Locality: 2790 feet to 2800 feet interval (= feet below the surface well site), Ohio Division of Geological Survey core 2627, American Aggregates Corporation limestone quarry (now flooded), just northeast of the town of Lytle, northwestern Wayne Township, northeastern Warren County, southwestern Ohio, USA Core-specific info. from: Shrake (1991) - The Middle Run Formation: a subsurface stratigraphic unit in southwestern Ohio. Ohio Journal of Science 91: 49-55. |
| Date | |
| Source | Own work |
| Author | James St. John |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:05, 25 December 2018 | | 4,000 × 2,336 (4.96 MB) | Jsj1771 | User created page with UploadWizard |
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