Abstract
Although Cambrian rocks from eastern Pennsylvania have been known for over a century, their interpretation has never been satisfactory. A basal quartzite is overlain by a thick sequence of dolomitic limestone. The quartzite is Early Cambrian. In the limestones occur rare invertebrate faunules and many calcareous algae by means of which it is possible to identify the upper third as Trempealeauian, the middle third as Dresbachian, but the age of the lower third is still uncertain. Lithologic changes coincide with paleontological differentiation. For the three parts of the limestone we here use, in descending order, the local formational names Allentown (restricted), Limeport, and Leithsville.
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