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- Chuar_Group abstract "The Neoproterozoic Chuar Group consists of 5,250 feet (1,600 m) of fossiliferous, unmetamorphosed sedimentary strata that is composed of about 85% mudrock. The Group is the approximate upper half of the Grand Canyon Supergroup, overlain by the thin, in comparison, Sixtymile Formation, the top member of the multi-membered Grand Canyon Supergroup.The mudrock is interbedded with meter-thick sandstone and dolomite beds. The mudrocks are typically gray to black when freshly exposed and weather to reddish or greenish colors. The fresh gray to black colors of the mudrocks are due to a high organic content. Some samples of these mudrocks contain high total-organic-carbon percentages that are as much 9.39 weight percent organic carbon. The sandstone beds often exhibit symmetrical ripple marks. These ripple marks are commonly draped with a thin veneer of mudstone with mudcracks. These strata have been subdivided into the Galeros Formation (lower) and the Kwagunt Formation (upper) using the base of the prominent, thick sandstone unit.The Chuar Group is quite fossiliferous. The dolomite beds are associated with at least six different types of either stromatolites or microbially influenced carbonate precipitation. The gray and black mudrocks often contain an abundance of microfossils, including vase-shaped microfossils (VSMs), acritarchs, “Sphaerocongregus variabilis“, and organic chemicals characteristic of dinoflagellates. Finally, the enigmatic circular fossils of Chuaria circularis are found at various levels within the Chuar Group.The types of fossils found and sedimentary strata comprising the Chuar Group are indicative of its deposition within a low-energy marine embayment. During the deposition of the Chuar Group, this embayment was influenced by tidal and wave processes, infrequent large storms, microbial activity and carbonate precipitation, and the accumulation of mud and organic matter in quiet water. The sediments and fossils suggest that the Chuar Group accumulated in relatively shallow water (tens of meters or less), possibly, with times of intermittent exposure on a tidal flat.".
- Chuar_Group thumbnail Stratigraphy_of_the_Grand_Canyon.png?width=300.
- Chuar_Group wikiPageExternalLink index.html.
- Chuar_Group wikiPageExternalLink chuar_group.htm.
- Chuar_Group wikiPageExternalLink galeros.htm.
- Chuar_Group wikiPageExternalLink kwagunt.htm.
- Chuar_Group wikiPageExternalLink nankoweap.htm.
- Chuar_Group wikiPageExternalLink sixtymile.htm.
- Chuar_Group wikiPageExternalLink unkar_group.htm.
- Chuar_Group wikiPageExternalLink great-unconformity-of-grand-canyon-part.html.
- Chuar_Group wikiPageExternalLink great-unconformity-of-grand-canyon-part.html.
- Chuar_Group wikiPageExternalLink supergroup.html.
- Chuar_Group wikiPageExternalLink 12-1.pdf.
- Chuar_Group wikiPageExternalLink geology_manual.htm.
- Chuar_Group wikiPageExternalLink index.cfm.
- Chuar_Group wikiPageID "40619809".
- Chuar_Group wikiPageRevisionID "602721094".
- Chuar_Group age "Neoproterozoic, 800 to 742 Ma".
- Chuar_Group country Southwestern_United_States.
- Chuar_Group namedby "Walcott and Noble".
- Chuar_Group namedfor "Chuar Canyon".
- Chuar_Group otherlithology "dolomite and sandstone".
- Chuar_Group overlies Nankoweap_Formation.
- Chuar_Group period "Neoproterozoic".
- Chuar_Group prilithology Mudstone.
- Chuar_Group region "Northern Arizona and southern Utah".
- Chuar_Group subunits "Galeros Formation and Kwagunt Formation".
- Chuar_Group thickness ", at maximum".
- Chuar_Group type Formation_(stratigraphy).
- Chuar_Group underlies "Sixtymile Formation and, as part of the Great Unconformity, the Tapeats Sandstone".
- Chuar_Group unitof Grand_Canyon_Supergroup.
- Chuar_Group subject Category:Geologic_formations_of_the_United_States.
- Chuar_Group subject Category:Geology_of_Arizona.
- Chuar_Group subject Category:Grand_Canyon.
- Chuar_Group comment "The Neoproterozoic Chuar Group consists of 5,250 feet (1,600 m) of fossiliferous, unmetamorphosed sedimentary strata that is composed of about 85% mudrock. The Group is the approximate upper half of the Grand Canyon Supergroup, overlain by the thin, in comparison, Sixtymile Formation, the top member of the multi-membered Grand Canyon Supergroup.The mudrock is interbedded with meter-thick sandstone and dolomite beds.".
- Chuar_Group label "Chuar Group".
- Chuar_Group sameAs m.0xnv_41.
- Chuar_Group sameAs Q16958225.
- Chuar_Group sameAs Q16958225.
- Chuar_Group wasDerivedFrom Chuar_Group?oldid=602721094.
- Chuar_Group depiction Stratigraphy_of_the_Grand_Canyon.png.
- Chuar_Group isPrimaryTopicOf Chuar_Group.