[2] The Wills Creek forms the bedrock of the valley around and to the east of Lewistown, Pennsylvania.

[3] The Wills Creek Limestone contain fossils from the Pridoli to the Ludlow epoch, or 422.9 to 418.1 Ma.

[5] Conodonts have been identified in the Wills Creek in Virginia (Ozarkodina snajdri crispa Zone).

[6] Relative age dating of the Wills Creek places it in the Silurian period.

[7] The Wills Creek is a poor source of construction material and is only suitable as common fill.