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By the Devonian the state was home to other kinds of fishes. On land, some of the world's oldest tetrapods left behind footprints that would later fossilize. Some of Pennsylvania's most important fossil finds were made in the state's Devonian rocks. [2] Carboniferous Pennsylvania was a swampy environment covered by a wide variety of plants.
The Devonian Catskill Group or the Catskill Clastic wedge is a unit of mostly terrestrial sedimentary rock found in Pennsylvania and New York. Minor marine layers exist in this thick rock unit (up to 10,000 feet (3,000 m)). It is equivalent to the Hampshire Formation of Maryland, West Virginia, and Virginia.
For example, during the Early Devonian, arid conditions were prevalent through much of the world including Siberia, Australia, North America, and China, but Africa and South America had a warm temperate climate. In the Late Devonian, by contrast, arid conditions were less prevalent across the world and temperate climates were more common.
Hynerpeton was found at the Red Hill site of Pennsylvania. This roadcut preserved fossils from the Duncannon member of the Catskill Formation, which was laid down in an ancient coastal floodplain. During the late Devonian, the floodplain was close to the equator, so the climate was warm and humid, with a dry and wet season.
Lock Haven Formation; Stratigraphic range: Devonian: Type: sedimentary: Unit of: Susquehanna Group: Sub-units: lower shaly member, upper sandy member, Minnehaha ...
In some places in Pennsylvania and Ohio, the Erie Plain is broken by the very slight former shoreline of Lake Warren. [4] This glacial sediment was laid atop the Chagrin and the Cleveland shales created in the late Devonian Period (382.5 to 359 million years ago), [ 5 ] as well as early Carboniferous Period shale in and west of Cleveland (laid ...
This list of the Paleozoic life of Pennsylvania contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Pennsylvania and are between 538.8 and 252.17 million years of age.
Outcrop of the Devonian Catskill Formation with a well-displayed thrust fault, located about 3 miles west of the village of Juniata Crossing on the north side of Route 30, Bedford County, Pennsylvania. Fossil coral of the Devonian Keyser Formation in the New Enterprise New Paris Quarry, Chestnut Ridge Bedford County, Pennsylvania.