Title: The Martinsburg Formation (middle and upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey
Description: "A clarification of the stratigraphy of clastic rocks of Middle and Late Ordovician age in western New Jersey and eastern Pennsylvania"--Cover.
Subjects: Geology, Nomenclature, Stratigraphic Geology, Stratigraphic correlation, Ordovician Geologic Period
Places: Martinsburg Formation, Martinsburg Formation (Pa.), New Jersey, Pennsylvania, Warren County
Time periods: Ordovician