World Library  
Flag as Inappropriate
Email this Article

Newark Supergroup

Article Id: WHEBN0008509059
Reproduction Date:

Title: Newark Supergroup  
Author: World Heritage Encyclopedia
Language: English
Subject: Phytosaur, Central Atlantic magmatic province, Ammosaurus, Aetosaur, Paul E. Olsen, Revueltosaurus, Rauisuchidae, Sphenosuchia, Doswellia, Geology of Pennsylvania
Publisher: World Heritage Encyclopedia

Newark Supergroup

The Newark Supergroup, also known as the Newark Group, is an assemblage of Late Triassic and Early Jurassic sedimentary rocks which outcrop intermittently along the United States East Coast; the exposures extend from Massachusetts to North Carolina, with more still in Nova Scotia. It is named for the city of Newark, New Jersey.


The Newark Supergroup consists largely of poorly-sorted nonmarine sediments; typical rocks are breccia, conglomerate, arkose sandstone, siltstone, and shale.[1][2] Most of the strata are red beds that feature ripple marks, mud cracks, and even rain drop prints; dinosaur footprints are common, though actual body fossils are very rare.[3] Some of the strata are detailed to the level of varves, with indications of Milankovitch cycles.[4] In preserved lake sediments, Semionotus fossils are especially common.[5]

The Newark sediments are extremely thick (up to 6 kilometers); they were deposited in a series of half-grabens that were themselves faulted into block mountains.[6] The beds dip to the east, while the faults dip westward.[7] The beds are intruded by numerous dikes and sills, indicative of considerable igneous activity; a superb example is the New Jersey Palisades sill.[8]


The Newark Supergroup's lithologies and structure are the classic hallmarks of a rift valley; the fault-blocking illustrates the crustal extension forces in play during the breakup of Pangea during the late Triassic Period.[9] The Appalachian Mountains had already been nearly eroded flat by the end of the period; the uplift and faulting that was the first part of the rifting provided new sources of sediment for the vast thicknesses deposited in the Newark Supergroup; the igneous intrusions are similarly diagnostic of a rift valley.[10] Coarse sediments were deposited near the eastern mountain front, while progressively finer ones were deposited farther west.[11]

Evidence suggests the climate at the time was subtropical and rainy, though divided between wet and dry months.[12] A few organic-rich deposits suggest patchy or intermittent swamps and lakes.[13]

Accumulation of Newark sediments continued from the late Triassic into the early Jurassic.[14]

See also


External links

  • Article." Retrieved on 12/18/06.
  • "Newark Supergroup." Retrieved on 12/18/06.
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.