The Ordovician in Delaware, US

Paleontology and geology

Although not shown on this map, some rocks of Ordovician age have been identified in the far northern end of the state. Most of these rocks are thought to have been metamorphosed during a mountain-building event (the Taconic Orogeny) between 470 and 440 million years ago. Although the original material was once sediments deposited in an ocean which covered the state in the Cambrian and early Ordovician, they do not contain any fossils.