The Monroe City Syncline is a subtle rock formation. A syncline is a downward-curving fold in the Earth’s crust with layers that dip toward the center of the structure. Folds typically form during crustal deformation as the result of compression. They appear clearly in sedimentary-type rock. The trough of the Monroe City Syncline roughly parallels the Valmeyer Anticline 3,500 to 4,500 feet to the northeast. Here is an ISGS map of the Syncline The Monroe City Syncline
We often find fossils preserved intact. Common types include Crinoids (sea lily), Coral, Brachiopods (Clams), and Bryozoan (corkscrews). "Fossil Ridge" in Devil's Hollow is the place to find them in large numbers. Four generations of kids in our family have amused themselves hunting fossils here. In 2012, I discovered that erosion on the opposite side of Devils Ridge (leading down to Panther's Hollow) is uncovering more fossils. In 2013, I blazed "Fossil Trail" a walking trail between Fossil Ridge and this new fossil area.
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