Scherr Formation

De Witt (1974) extended the Scherr and Foreknobs into Pennsylvania but did not use the term Greenland Gap Group.

[3] The Minnehaha Springs Member is a "clastic bundle" consisting of interbedded medium gray siltstone and olive-gray shale with some grayish-red siltstone and shale and some sandstone.

[4] This same member is proposed to exist at the base of the Scherr's lateral equivalent, the Lock Haven Formation.

[5] Relative age dating places the Scherr in the late Devonian.

The Scherr Formation is the likely origin of the trace fossil Thinopus, which was described in 1896 by Othniel Charles Marsh as the earliest known tetrapod (land vertebrate).