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- Unkar_Group abstract "The Unkar Group is a sequence of strata of Proterozoic age that are subdivided into five geologic formations and exposed within the Grand Canyon, Arizona, USA. It is about 1,600 to 2,200 m (5,200 to 7,200 ft) thick and composed, in ascending order, of the Bass Formation, Hakatai Shale, Shinumo Quartzite, Dox Formation, and Cardenas Basalt. It accumulated approximately between 1250 and 1104 Ma (1,104 million years ago, 1.1 billion). In ascending order, the Unkar Group is overlain by the Nankoweap Formation, about 113 to 150 m (371 to 492 ft) thick; the Chuar Group, about 1,900 m (6,200 ft) thick; and the Sixtymile Formation, about 60 m (200 ft) thick. The Nankoweap and Sixtymile formations together with the Chuar and Unkar groups comprise the Grand Canyon Supergroup.In general, the strata comprising the Unkar Group dip northeast (10°-30°) toward normal faults that dip 60+° toward the southwest. This can be seen at the Palisades fault in the eastern part of the main Unkar Group outcrop area (below East Rim). Within the central Grand Canyon, these strata occur in small, rotated, downfaulted blocks or slivers where they commonly are only partially exposed. Within this part of the Grand Canyon, the Unkar Group is incomplete because pre-Tonto Group erosion has removed strata above the level of the middle part of the Dox Formation. The missing part of the Unkar Group and the remainder of the overlying Grand Canyon Supergroup are preserved in a prominent syncline and fault block that is exposed in the eastern Grand Canyon. Examples of these fault blocks can be seen at the Isis Temple prominence, "Cheops Pyramid," and the intersection of Phantom Creek with the Bright Angel Canyon, (North Kaibab Trail). The Unkar Group contains thick basaltic sills and a number of small, dark dikes. In the area of Desert View and west of Palisades of the Desert, the basaltic sills form very prominent, dark gray cliffs.Using gravity and aeromagnetic data, combined with gravity modeling, it was inferred that Proterozoic grabens, and half-grabens filled with strata of the Unkar Group – lie buried beneath Phanerozoic rocks in northern Arizona that surround the Grand Canyon. The grabens and half grabens filled with strata of the Unkar group are associated with northwest–southeast trending Mesoproterozoic fault systems that have curving, southwest-dipping traces. These fault systems were later reactivated during the Neoproterozoic, to form basins in which the following Chuar Group accumulated, and during the Cenozoic, to form geologic structures, i.e., faults, anticlines, synclines, and monoclines, that are exposed at the surface.Major unconformities separate the Unkar Group from the strata overlying and underlying it. First, the Unkar Group, as the bottom unit of the Grand Canyon Supergroup, lies directly upon deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks. Second, an angular unconformity, with a dip of less than 10°, separates the base of the Nankoweap Formation from the underlying Unkar Group. Finally, a well-defined angular unconformity at the base of the relatively flat-lying Tonto Group separates it from the underlying faulted and folded strata of the Unkar Group and the rest of the Grand Canyon Supergroup that are typically tilted at angles of 10°-30°.".
- Unkar_Group thumbnail Comanche_Point,_on_the_South_Rim_of_the_Grand_Canyon.jpg?width=300.
- Unkar_Group wikiPageExternalLink index.html.
- Unkar_Group wikiPageExternalLink grandcanyon_supergroup.htm.
- Unkar_Group wikiPageExternalLink nankoweap.htm.
- Unkar_Group wikiPageExternalLink unkar_group.htm.
- Unkar_Group wikiPageExternalLink vishnu.htm.
- Unkar_Group wikiPageExternalLink publications.html.
- Unkar_Group wikiPageExternalLink research_unkar.html.
- Unkar_Group wikiPageExternalLink supergroup.html.
- Unkar_Group wikiPageExternalLink 12-1.pdf.
- Unkar_Group wikiPageExternalLink image.asp?ImageID=3091&history=0&categoryid=57.
- Unkar_Group wikiPageExternalLink index.asp.
- Unkar_Group wikiPageExternalLink supergroup_formations.shtml.
- Unkar_Group wikiPageExternalLink index.htm.
- Unkar_Group wikiPageExternalLink index.cfm.
- Unkar_Group wikiPageID "35860386".
- Unkar_Group wikiPageLength "27139".
- Unkar_Group wikiPageOutDegree "91".
- Unkar_Group wikiPageRevisionID "676493341".
- Unkar_Group wikiPageWikiLink Arizona.
- Unkar_Group wikiPageWikiLink Basalt.
- Unkar_Group wikiPageWikiLink Bass_Formation.
- Unkar_Group wikiPageWikiLink Cardenas_Basalt.
- Unkar_Group wikiPageWikiLink Category:Geologic_groups_of_Arizona.
- Unkar_Group wikiPageWikiLink Category:Natural_history_of_the_Grand_Canyon.
- Unkar_Group wikiPageWikiLink Charles_Doolittle_Walcott.
- Unkar_Group wikiPageWikiLink Charles_Rollin_Keyes.
- Unkar_Group wikiPageWikiLink Chuar_Group.
- Unkar_Group wikiPageWikiLink Cliff-former.
- Unkar_Group wikiPageWikiLink Colorado_River.
- Unkar_Group wikiPageWikiLink Desert_View,_Arizona.
- Unkar_Group wikiPageWikiLink Desert_View_Watchtower.
- Unkar_Group wikiPageWikiLink Diabase.
- Unkar_Group wikiPageWikiLink Dike_(geology).
- Unkar_Group wikiPageWikiLink Dolomite.
- Unkar_Group wikiPageWikiLink Dox_Formation.
- Unkar_Group wikiPageWikiLink Fault_(geology).
- Unkar_Group wikiPageWikiLink Fault_block.
- Unkar_Group wikiPageWikiLink Feldspar.
- Unkar_Group wikiPageWikiLink Fold_(geology).
- Unkar_Group wikiPageWikiLink Geologic_formation.
- Unkar_Group wikiPageWikiLink Geologic_group.
- Unkar_Group wikiPageWikiLink Geological_formation.
- Unkar_Group wikiPageWikiLink Geologist.
- Unkar_Group wikiPageWikiLink Gneiss.
- Unkar_Group wikiPageWikiLink Grand_Canyon.
- Unkar_Group wikiPageWikiLink Grand_Canyon_Supergroup.
- Unkar_Group wikiPageWikiLink Granite.
- Unkar_Group wikiPageWikiLink Great_Unconformity.
- Unkar_Group wikiPageWikiLink Hakatai_Shale.
- Unkar_Group wikiPageWikiLink Hance_Rapid.
- Unkar_Group wikiPageWikiLink Inselberg.
- Unkar_Group wikiPageWikiLink Isis_Temple.
- Unkar_Group wikiPageWikiLink Levi_F._Noble.
- Unkar_Group wikiPageWikiLink Limestone.
- Unkar_Group wikiPageWikiLink List_of_Colorado_River_rapids_and_features.
- Unkar_Group wikiPageWikiLink Marine_transgression.
- Unkar_Group wikiPageWikiLink Monadnock.
- Unkar_Group wikiPageWikiLink Nankoweap_Formation.
- Unkar_Group wikiPageWikiLink North_Kaibab_Trail.
- Unkar_Group wikiPageWikiLink Pegmatite.
- Unkar_Group wikiPageWikiLink Peneplain.
- Unkar_Group wikiPageWikiLink Phantom_Creek.
- Unkar_Group wikiPageWikiLink Proterozoic.
- Unkar_Group wikiPageWikiLink Quartzite.
- Unkar_Group wikiPageWikiLink Regolith.
- Unkar_Group wikiPageWikiLink Sandstone.
- Unkar_Group wikiPageWikiLink Schist.
- Unkar_Group wikiPageWikiLink Scree.
- Unkar_Group wikiPageWikiLink Shale.
- Unkar_Group wikiPageWikiLink Shinumo_Quartzite.
- Unkar_Group wikiPageWikiLink Sill_(geology).
- Unkar_Group wikiPageWikiLink Siltstone.
- Unkar_Group wikiPageWikiLink Sixtymile_Formation.
- Unkar_Group wikiPageWikiLink Southwest_United_States.
- Unkar_Group wikiPageWikiLink Southwestern_United_States.
- Unkar_Group wikiPageWikiLink Strata.
- Unkar_Group wikiPageWikiLink Stratigraphic_unit.
- Unkar_Group wikiPageWikiLink Stratum.
- Unkar_Group wikiPageWikiLink Stromatolite.
- Unkar_Group wikiPageWikiLink Subaerial.
- Unkar_Group wikiPageWikiLink Syncline.
- Unkar_Group wikiPageWikiLink Tanner_Graben.
- Unkar_Group wikiPageWikiLink Tapeats_Sandstone.
- Unkar_Group wikiPageWikiLink Tonto_Group.
- Unkar_Group wikiPageWikiLink Uranium-lead_dating.
- Unkar_Group wikiPageWikiLink Vishnu_Basement_Rocks.
- Unkar_Group wikiPageWikiLink Volcanic.
- Unkar_Group wikiPageWikiLink Volcano.
- Unkar_Group wikiPageWikiLink Weathering.
- Unkar_Group wikiPageWikiLink Zircon.
- Unkar_Group wikiPageWikiLink File:Grand_Canyon_Lipan_Point01.jpg.
- Unkar_Group wikiPageWikiLink File:Grand_Canyon_Supergroup_showing_Cardenas_Lava.JPG.
- Unkar_Group wikiPageWikiLinkText "Unkar Group".
- Unkar_Group wikiPageWikiLinkText "Unkar".
- Unkar_Group age "Meso-Proterozoic, between 1,254 and 1,100 Ma".
- Unkar_Group area "Arizona, east Grand Canyon, Lava Butte region, on Colorado River, near Lipan Point".
- Unkar_Group caption "Reddish Dox Formation below Cardenas Basalt, upstream from Tanner Graben".
- Unkar_Group country Southwest_United_States.