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File:Mt. Simon Sandstone (Middle Cambrian; Warren County core, Ohio, USA) 7.jpg

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English: Sandstone from the Cambrian of Ohio, USA.

This is part of a continuously-cored section of Cambrian sandstone 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 Mt. Simon Sandstone, a Middle Cambrian-aged sandstone unit. In most of Ohio's subsurface, the Mt. Simon is the basal Phanerozoic sedimentary unit - Precambrian hard rocks typically occur below it.

The colors in these rocks are from iron oxides.

Stratigraphy: Mt. Simon Sandstone, Middle Cambrian

Locality: 3330 feet to 3340 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.
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Author James St. John

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