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searching for Detroit River Group 2 found (88 total)

Geology of Ohio (1,644 words) [view diff] exact match in snippet view article find links to article

include the Columbus Limestone to the east of the Findlay Arch and the Detroit River Group carbonates to the west. The angular unconformity between lower Silurian

Bromine production in the United States (1,324 words) [view diff] exact match in snippet view article find links to article

late 1900s, production had shifted to the Filer Sandstone of the Detroit River Group, of Devonian age, with bromine concentrations of about 2,600 ppm