Publisher's Synopsis
Excerpt from Guide to the City of Philadelphia
Suessonian. Resting with a slight unconformability Upon the Eocene, and covered by a superficial deposit of sand and gravel of as yet-ah undetermined age, are the Miocene beds, whose horizon appears to be approxi mately that of the lower (or both lower and upper) Mediterranean. Fossil remains have thus far been but very Sparingly collected from this formation.
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