How did the rocks of Penny's Bend form?

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Penny's Bend in the Beginning

 

The Geologic History of Penny's Bend

During the Jurassic (approximately 195-205 million years ago) dikes and sills of mafic composition intruded the sediments of the Triassic basin and surrounding crystalline rocks.  This rock is known as diabase. Diabase is more resistant than the surrounding sandstones and siltstones and often forms resistant ridges in the Triassic basin.  Penny’s Bend on the Eno River is underlain by diabase.  Diabase is composed of minerals that contain abundant iron and magnesium in comparison to the Triassic sediments.  Because of the abundance of iron and magnesium, unique plant communities sometime develop on top of areas underlain by diabase.

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Want to learn more about the geology of the Eno River area?

You may be interested in A Geologic Adventure Along the Eno River - A richly illustrated publication from the North Carolina Geological Survey.