Paleontology in West Virginia

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The location of the state of West Virginia Map of USA WV.svg
The location of the state of West Virginia

Paleontology in West Virginia refers to paleontological research occurring within or conducted by people from the U.S. state of West Virginia. West Virginia's fossil record begins in the Cambrian. From that time through the rest of the early Paleozoic, the state was at least partially submerged under a shallow sea. The Paleozoic seas of West Virginia were home to creatures like corals, eurypterids, graptolites, nautiloids, and trilobites at varying times. During the Carboniferous period, the sea was replaced by lushly vegetated coastal swamps. West Virginia is an excellent source of fossil plants due to these deposits. [1] These swamps were home to amphibians. A gap in the local rock record spans from the Permian to the end of the Cenozoic. West Virginia was never the site of glacial activity during the Ice Age, but the state was home to creatures like mammoths, mastodons, and giant ground sloths. One local ground sloth, Megalonyx jeffersonii, was subject to the scholarly investigations of Thomas Jefferson, who misinterpreted the large-clawed remains as belonging to a lion-like predator. In 2008, this species was designated the West Virginia state fossil.

Contents

Prehistory

Paleozoic

Paleogeographic reconstruction showing the Appalachian Basin area during the Middle Devonian period. Eastern North American Paleogeograpy Middle Devonian.png
Paleogeographic reconstruction showing the Appalachian Basin area during the Middle Devonian period.

About 500 million years ago during the Cambrian period, West Virginia was almost completely covered by a shallow sea. [2] This sea was inhabited by graptolites, stromatolites, trilobites, and worms. [3] The abundant fossils of the Cambrian Antietam Formation are the oldest evidence of life in the state. [4] West Virginia's Cambrian sea persisted on into the ensuing Ordovician. [2] West Virginia was home to graptolites at that time and they left their remains behind in what would later become dark colored shales. [5] At the same time, mountains were being uplifted in the eastern part of the state. [3] West Virginia's Silurian rocks preserve evidence for the mixing of both marine and non-marine environments. [2] Silurian evaporites left by extremely salty seawater during a dry climate preserved West Virginian eurypterids. [6] Other Silurian life forms of West Virginia included nautiloids with straight shells and an abundance of ostracods. [3] Late in the Devonian the sea quickly withdrew to the west. The Hampshire Formation's continental red beds were deposited during this regression. [2] During the transition from the Silurian to Early Devonian West Virginia was home to corals, whose remains fossilized by silicification. [7] During the Late Devonian the state's seas had begun filling in with sediments eroded from mountains outside of the state. [3]

Reconstruction of Lepidodendron. Stigmaria Heimans.jpg
Reconstruction of Lepidodendron.

However, the state would once more be submerged during the early part of the Carboniferous period. [3] By the Middle Mississippian, the sea had once more expanded its boundaries over the state. In the process it deposited the Greenbrier Formation, which was the last stratigraphic unit of significance to have been laid down in a marine environment. By 310 million years ago, the Mississippian was ending and West Virginia was dry land. West Virginia was swampy during the late Mississippian and its lush flora left behind many plant fossils. [8] During the Mississippian, West Virginia was home to anthracosaur amphibians. One was a long-bodied form about 80 cm long that left behind footprints classified as the ichnospecies Hylopus hamesi . This trackmaker may have been Protergyrinus scheelei , a Mississippian amphibian known from body fossils in West Virginia. The tracks reveal that it was capable of both walking on land and swimming. [9]

Into the Pennsylvanian, the local elevation was low and on brief occasions West Virginia fell below sea level. Huge river systems formed great deltas. [3] Swamps were abundant across West Virginia at the time, and these became its modern coal seams. [2] The dense vegetation of these swamps left behind many plant fossils. [8] The Carboniferous coal swamps of West Virginia were dominated by ground pines of the genus Lepidodendron that could reach more than 100 feet in height. Sigilaria , however, was the largest tree and could be up to six feet in diameter at the base. [10] Other Carboniferous plant fossils in West Virginia include the leaves of seed ferns Alethopteris . Other Pennsylvanian West Virginian seed ferns included Callipteridium , Callipteris , Lescuropteris , and Linopteris . [11] Neuropteris was a contemporary fern-like plant. [10] The true fern Pecopteris also grew in West Virginia during the Pennsylvanian. [12] Amphibians also inhabited in these swamps. [3]

Between 270 and 255 million years ago, during the Permian period, the Appalachian Mountains began to form. West Virginia began losing sediments to erosion rather than accumulating them. No part of West Virginia has been covered in seawater since the Appalachians began rising. [2]

Mesozoic and Cenozoic

There are no Triassic, Jurassic, or Cretaceous rocks are present in West Virginia, so the entire Mesozoic is missing from the state's rock record. [3] As such, no dinosaur fossils have ever been discovered in West Virginia. [13]

The ensuing Paleogene and Neogene periods of the Cenozoic era is also missing from the state's rock record. [3] During the Ice Age the glaciers never extended sufficiently far south to cross into West Virginia, but during their southernmost extent they nearly approached the northern panhandle. [2] The glaciers dammed the Monongahela River system, forming a lake that extended as far south as Weston. [14] Local wildlife included mammoths, mastodons, and giant ground sloths, who left their remains behind in local caves. [3] One of the most well known fossils from West Virginia is the American cheetah ( Miracinonyx inexpectatus ). [15] [16]

History

Claws of M. jeffersonii Megalonyx CasparWistar claw Griffe1799.jpg
Claws of M. jeffersonii

Near the end of the 18th century, workers operating saltpeter vats in a cave then considered part of Greenbrier County, Virginia discovered fossil limb bones. In 1796, man named John Stuart sent these remains to Thomas Jefferson. Jefferson recognized them as being from a genus unknown to science and named the creature Megalonyx . The cave from which these fossils were taken later came to be identified with Organ Cave. [17] Since the industrial revolution, the process of mining coal has responsible for many discoveries of fossil trackways. Some have been discovered serendipitously in West Virginia. [18] Such discoveries frequently occur when the excavation of coal mines removes the rock underlying the trackway, leaving it exposed on the tunnel's ceiling. [18] More recently, in 1990, Frederick A. Sundberg, and other colleagues erected the new ichnospecies Hylopus hamesi to hold fossil amphibian footprints from the latest Mississippian Bluefield Formation. This ichnospecies represented the oldest evidence for terrestrial vertebrates in the eastern United States. Based on the anatomy of the foot responsible for the traces, the researchers concluded that the tracks were left by anthracosaurs, possibly the species Protergyrinus scheelei , which was also known from West Virginia's Mississippian deposits. Variations in the structure of the trackways suggested that some of them were left while the animal was swimming, and thus the tracks suggest it was capable of walking on land and swimming underwater. [9]

In 1993, two pieces of a Megalonyx shoulder blade were found in Haynes Cave of Monroe County, West Virginia, suggesting it may have been the true location where the Megalonyx bones examined by Thomas Jefferson were discovered, rather than Organ Cave. In 1995 Fred Grady further debunked the association between the Megalonyx fossils and Organ Cave since the original discovery site was owned at the time of the discovery by a man named Frederic Gromer, who had never owned Organ Cave. However, he did own Haynes Cave. Additional details gleaned from descriptions of Haynes Cave taken from the correspondence of subsequent owner, Tristram Patton, add more evidence that it was the true site of the discovery of Megalonyx. [17] In 2008 Megalonyx jeffersonii , would be designated the West Virginia state fossil.

Natural history museums

Events

Private and commercial enterprises

See also

Footnotes

  1. Murray (1974); "West Virginia", page 285.
  2. 1 2 3 4 5 6 7 Cardwell (1975); "Summary", page 61.
  3. 1 2 3 4 5 6 7 8 9 10 Kammer, Scotchmoor, and Springer (2005); "Paleontology and geology".
  4. Cardwell (1975); "Summary", page 62.
  5. Picconi (2003); "Ancient Seascapes of the Inland Basins: Muddy, oxygen-poor environments preserved as black shale", page 93.
  6. Picconi (2003); "Ancient Seascapes of the Inland Basins: Hypersaline environments preserved as evaporites (salt, gypsum, anhydrite)", page 94.
  7. Picconi (2003); "Ancient Seascapes of the Inland Basins: Clear, shallow environments preserved as limestone", page 93.
  8. 1 2 Picconi (2003); "Ancient Landscapes of the Inland Basins: Swamp environments preserved as dark shale or siltstone", page 94.
  9. 1 2 Sundberg, et al. (1990); "Abstract", page 111.
  10. 1 2 Murray (1974); "West Virginia", page 287.
  11. Murray (1974); "West Virginia", pages 287-288.
  12. Murray (1974); "West Virginia", page 288.
  13. Weishampel and Young (1996); "Introduction", page 2.
  14. Cardwell (1975); "Summary", pages 61-62.
  15. Van Valkenburgh, Blaire; Grady, Frederick; Kurtén, Björn (1990-12-20). "The Plio-Pleistocene cheetah-like catMiracinonyx inexpectatusof North America". Journal of Vertebrate Paleontology. 10 (4): 434–454. doi:10.1080/02724634.1990.10011827. ISSN   0272-4634.
  16. "Did False Cheetahs Give Pronghorn a Need for Speed?". Science. 2013-01-08. Archived from the original on March 23, 2021. Retrieved 2021-08-25.
  17. 1 2 Grady (1997); "Abstract", page 57.
  18. 1 2 Lockley and Hunt (1999); "Western Traces in the 'Age of Amphibians'", page 34.

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<span class="mw-page-title-main">Paleontology in Oklahoma</span> Paleontological research in the U.S. state of Oklahoma

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<span class="mw-page-title-main">Paleontology in Texas</span> Paleontological research in U.S

Paleontology in Texas refers to paleontological research occurring within or conducted by people from the U.S. state of Texas. Author Marian Murray has said that "Texas is as big for fossils as it is for everything else." Some of the most important fossil finds in United States history have come from Texas. Fossils can be found throughout most of the state. The fossil record of Texas spans almost the entire geologic column from Precambrian to Pleistocene. Shark teeth are probably the state's most common fossil. During the early Paleozoic era Texas was covered by a sea that would later be home to creatures like brachiopods, cephalopods, graptolites, and trilobites. Little is known about the state's Devonian and early Carboniferous life. Evidence indicates that during the late Carboniferous the state was home to marine life, land plants and early reptiles. During the Permian, the seas largely shrank away, but nevertheless coral reefs formed in the state. The rest of Texas was a coastal plain inhabited by early relatives of mammals like Dimetrodon and Edaphosaurus. During the Triassic, a great river system formed in the state that was inhabited by crocodile-like phytosaurs. Little is known about Jurassic Texas, but there are fossil aquatic invertebrates of this age like ammonites in the state. During the Early Cretaceous local large sauropods and theropods left a great abundance of footprints. Later in the Cretaceous, the state was covered by the Western Interior Seaway and home to creatures like mosasaurs, plesiosaurs, and few icthyosaurs. Early Cenozoic Texas still contained areas covered in seawater where invertebrates and sharks lived. On land the state would come to be home to creatures like glyptodonts, mammoths, mastodons, saber-toothed cats, giant ground sloths, titanotheres, uintatheres, and dire wolves. Archaeological evidence suggests that local Native Americans knew about local fossils. Formally trained scientists were already investigating the state's fossils by the late 1800s. In 1938, a major dinosaur footprint find occurred near Glen Rose. Pleurocoelus was the Texas state dinosaur from 1997 to 2009, when it was replaced by Paluxysaurus jonesi after the Texan fossils once referred to the former species were reclassified to a new genus.

<span class="mw-page-title-main">Paleontology in Colorado</span> Paleontological research in the U.S. state of Colorado

Paleontology in Colorado refers to paleontological research occurring within or conducted by people from the U.S. state of Colorado. The geologic column of Colorado spans about one third of Earth's history. Fossils can be found almost everywhere in the state but are not evenly distributed among all the ages of the state's rocks. During the early Paleozoic, Colorado was covered by a warm shallow sea that would come to be home to creatures like brachiopods, conodonts, ostracoderms, sharks and trilobites. This sea withdrew from the state between the Silurian and early Devonian leaving a gap in the local rock record. It returned during the Carboniferous. Areas of the state not submerged were richly vegetated and inhabited by amphibians that left behind footprints that would later fossilize. During the Permian, the sea withdrew and alluvial fans and sand dunes spread across the state. Many trace fossils are known from these deposits.

<span class="mw-page-title-main">Paleontology in New Mexico</span> Paleontological research in the U.S. state of New Mexico

Paleontology in New Mexico refers to paleontological research occurring within or conducted by people from the U.S. state of New Mexico. The fossil record of New Mexico is exceptionally complete and spans almost the entire stratigraphic column. More than 3,300 different kinds of fossil organisms have been found in the state. Of these more than 700 of these were new to science and more than 100 of those were type species for new genera. During the early Paleozoic, southern and western New Mexico were submerged by a warm shallow sea that would come to be home to creatures including brachiopods, bryozoans, cartilaginous fishes, corals, graptolites, nautiloids, placoderms, and trilobites. During the Ordovician the state was home to algal reefs up to 300 feet high. During the Carboniferous, a richly vegetated island chain emerged from the local sea. Coral reefs formed in the state's seas while terrestrial regions of the state dried and were home to sand dunes. Local wildlife included Edaphosaurus, Ophiacodon, and Sphenacodon.

This timeline of paleontology in West Virginia is a chronologically ordered list events in the history of paleontological research occurring within or conducted by people from the U.S. state of West Virginia.

References