Sub Layers:
Name: Map 7: Structure Contours of the Top of the Ordovician Trenton Limestone (or Equivalent)
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Type: Group Layer
Geometry Type: null
Description: This map shows the variation in elevation of the top of the Trenton Limestone, a unit deposited near the end of the Ordovician. The Trenton is the deepest sedimentary unit contoured. Its elevation clearly shows the shape of the Illinois Basin, the Rough Creek Graben, and the Cincinnati Arch. The color of this map coincides with the color of the Ordovician Stage rocks depicted on the Bedrock Geology with Bedrock Topography map (Map 4).
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Extent:
XMin: -592735.9859713758
YMin: -368012.2247130368
XMax: 609362.3664954993
YMax: 377794.11207634397
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