home   Printer friendly version Add to site
Advanced search
Time & Space Fossil Gallery Famous Flora & Fauna
Careers Resources K-12 Collections PaleoPeople

The Ordovician in Pennsylvania, US

Ordovician in Pennsylvania map

undifferentiated rock units help

Choose a time period:


Ordovician Fossils
Fossil photos from Ordovician in Pennsylvania

Previous (4 slides) Next
Search the fossil gallery

Paleontology and geology

Warm, shallow seas covered the state during the Early and Middle Ordovician. Brachiopods, clams, snails, trilobites, and bryozoans lived on the quiet sea floor, and nautiloid cephalpods swam through the water. During the Late Ordovician, plate movement caused the North American continent to collide with a volcanic island arc that had formed to the east of what is now Pennsylvania. This mountain-building event, the Taconic Orogeny, created a mountain range along the ancient continental margin in approximately the same area that we see the Appalachians today.

Links to more on the Ordovician in Pennsylvania

Research and Collections

Research and Collections

Ongoing Research Projects (showing 1 of 1 listings)

Carnegie Museum: Invertebrate Paleontology Section: The Carnegie Museum of Natural History Section of Invertebrate Paleontology has more than 100 years of research, field work, educational outreach (PALS), and exhibits on Phanerozoic life. Our collections number more than three-quarters of a million specimens with some 11,000 type and figured specimens published in more than 300 professional publications. Our type and collection strengths are concentrated in the Lower and Upper Paleozoic rocks of the Appalachians, mid-continent, and western Interior Seaway. 

top Top of List

New York State Map
New Jersey State Map
Delaware State Map
Maryland State Map
West Virginia State Map
Ohio State Map
Ontario Province Map