Serpentine

Serpentinite

Massive fine-grained dark to light yellow-green serpentinite. Contacts with the Wissahickon Formation are not exposed.

Schenck rocks out on railroad geological tours

Date

William S. Schenck, a scientist with the Delaware Geological Survey, has been taking students from A.I. duPont High School on Wilmington & Western Railroad tours, observing rock outcrop locations along the way.