Interval: Coalburg seam
Age: Middle Pennsylvanian Period, approx. 307 million years.
Erempteris bears a great resemblence to Sphenopteris, but is distinguished from the latter by it's larger, more irregularly-shaped leaflets, which can be either lobed or disected. The leaflets are also usually decurrent, and lack a definite midvein.
Location: Nicholas County, West Virginia; Ramp Run Surface Mine #1, located about 12 miles north of Summersville, West Virginia. Turn west off route 19 north of Summersville onto Spruce Run Road. Follow it out the ridge about 7 miles before veering left down into Buffalo Creek.