undifferentiated rock units

Paleontology and geology

Warm, shallow seas covered New Jersey during Cambrian time. Quartzite (metamorphosed sandstone) and thick limestone deposits typify the rocks found in outcrops of this time and indicate a quiet geologic time interval for this part of the North American continent. Fossils, including the trilobite Olenellus, vertical worm burrows (Skolithos), and stromatolites attest to the marine origin of the Cambrian formations of northwestern New Jersey.