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• Nankoweap_Formation abstract "The Neoproterozoic Nankoweap Formation (pronounced Nan' coe weep), is a thin sequence of distinctive red beds that consist of reddish brown and tan sandstones and subordinate siltstones and mudrocks that unconformably overlie basaltic lava flows of the Cardenas Basalt of the Unkar Group and underlie the sedimentary strata of the Galeros Formation of the Chuar Group. The Nankoweap Formation is slightly more than 100 m in thickness. It is informally subdivided into informal lower and upper members that are separated and enclosed by unconformities. Its lower (ferruginous) member is 0 to 15 m thick. The Grand Canyon Supergroup, of which the Nankoweap Formation is part, unconformably overlies deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks.The strata of the Nankoweap Formation are exposed in a small area that occupies an area from just south of Carbon Canyon to Basalt Canyon on the west bank of the Colorado River to around Comanche Creek and Tanner Canyon on the east bank of the Colorado River within the eastern Grand Canyon, Coconino County, Arizona. It and associated strata of the Unkar and Chuar groups are preserved in a prominent syncline and fault block. The most complete, readily accessible, and easily studied, exposure of the Nankoweap Formation occurs in Basalt Canyon.The nomenclature of the Nankoweap Formation has changed over time. Originally, the strata of the Nankoweap Formation was included in-part in the top of the "Unkar terrane" (Group) and in-part in the basal “Chuar terrane” (Group) by Walcott in 1894. Van Gundy first recognized the thin sequence of red beds unconformably overlying basaltic flows of the Unkar Group as a separate stratigraphic unit, which he called the “Nankoweap Group.“Although more extensive outcrops exist in Basalt Canyon, Comanche Creek, and Tanner Canyon, it is named for a small, fault-bounded block of the Nankoweap Formation in Nankoweap Canyon. It was argued that these redbeds belonged neither to the underlying Unkar Group nor overlying Chuar Group. Maxson in his geological mapping reduced the Nankoweap Group to formational rank because the Nankoweap had not been subdivided into formations. Later, a locally preserved lower member (ferruginous unit and weathered zone) that unconformably overlies the Cardenas Basalt and is unconformably overlain by the upper member of the Nankoweap – was recognized.".
• Nankoweap_Formation thumbnail View_from_Lipan_Point.jpg?width=300.
• Nankoweap_Formation wikiPageExternalLink index.html.
• Nankoweap_Formation wikiPageExternalLink chuar_group.htm.
• Nankoweap_Formation wikiPageExternalLink grandcanyon_supergroup.htm.
• Nankoweap_Formation wikiPageExternalLink nankoweap.htm.
• Nankoweap_Formation wikiPageExternalLink unkar_group.htm.
• Nankoweap_Formation wikiPageExternalLink great-unconformity-of-grand-canyon-part.html.
• Nankoweap_Formation wikiPageExternalLink great-unconformity-of-grand-canyon-part.html.
• Nankoweap_Formation wikiPageExternalLink supergroup.html.
• Nankoweap_Formation wikiPageExternalLink 12-1.pdf.
• Nankoweap_Formation wikiPageID "35878169".
• Nankoweap_Formation wikiPageLength "21007".
• Nankoweap_Formation wikiPageOutDegree "87".
• Nankoweap_Formation wikiPageRevisionID "657344125".
• Nankoweap_Formation wikiPageWikiLink Asterosoma.
• Nankoweap_Formation wikiPageWikiLink Barite.
• Nankoweap_Formation wikiPageWikiLink Baryte.
• Nankoweap_Formation wikiPageWikiLink Basalt.
• Nankoweap_Formation wikiPageWikiLink Beach.
• Nankoweap_Formation wikiPageWikiLink Butte_Fault.
• Nankoweap_Formation wikiPageWikiLink Cardenas_Basalt.
• Nankoweap_Formation wikiPageWikiLink Category:Geologic_formations_of_Arizona.
• Nankoweap_Formation wikiPageWikiLink Category:Natural_history_of_the_Grand_Canyon.
• Nankoweap_Formation wikiPageWikiLink Cementation_(geology).
• Nankoweap_Formation wikiPageWikiLink Chert.
• Nankoweap_Formation wikiPageWikiLink Chuar_Group.
• Nankoweap_Formation wikiPageWikiLink Cobble_(geology).
• Nankoweap_Formation wikiPageWikiLink Colorado_River.
• Nankoweap_Formation wikiPageWikiLink Conglomerate_(geology).
• Nankoweap_Formation wikiPageWikiLink Cretaceous–Paleogene_boundary.
• Nankoweap_Formation wikiPageWikiLink Cross-bedding.
• Nankoweap_Formation wikiPageWikiLink Detritus_(geology).
• Nankoweap_Formation wikiPageWikiLink Dolomite.
• Nankoweap_Formation wikiPageWikiLink Dox_Formation.
• Nankoweap_Formation wikiPageWikiLink Dox_Sandstone.
• Nankoweap_Formation wikiPageWikiLink Fault_block.
• Nankoweap_Formation wikiPageWikiLink Fold_(geology).
• Nankoweap_Formation wikiPageWikiLink Geological_formation.
• Nankoweap_Formation wikiPageWikiLink Geology_of_the_Grand_Canyon_area.
• Nankoweap_Formation wikiPageWikiLink Gneiss.
• Nankoweap_Formation wikiPageWikiLink Graben.
• Nankoweap_Formation wikiPageWikiLink Grand_Canyon.
• Nankoweap_Formation wikiPageWikiLink Grand_Canyon_Supergroup.
• Nankoweap_Formation wikiPageWikiLink Granite.
• Nankoweap_Formation wikiPageWikiLink Gravel.
• Nankoweap_Formation wikiPageWikiLink Great_Unconformity.
• Nankoweap_Formation wikiPageWikiLink Hematite.
• Nankoweap_Formation wikiPageWikiLink Iron_oxide.
• Nankoweap_Formation wikiPageWikiLink Lag_deposit.
• Nankoweap_Formation wikiPageWikiLink Lava.
• Nankoweap_Formation wikiPageWikiLink Marble_Canyon.
• Nankoweap_Formation wikiPageWikiLink Mudcrack.
• Nankoweap_Formation wikiPageWikiLink Mudflat.
• Nankoweap_Formation wikiPageWikiLink Mudrock.
• Nankoweap_Formation wikiPageWikiLink Neoproterozoic.
• Nankoweap_Formation wikiPageWikiLink Paleosol.
• Nankoweap_Formation wikiPageWikiLink Pebble.
• Nankoweap_Formation wikiPageWikiLink Pegmatite.
• Nankoweap_Formation wikiPageWikiLink Prospecting.
• Nankoweap_Formation wikiPageWikiLink Pseudomorph.
• Nankoweap_Formation wikiPageWikiLink Quartzite.
• Nankoweap_Formation wikiPageWikiLink Radiometric_dating.
• Nankoweap_Formation wikiPageWikiLink Red_bed.
• Nankoweap_Formation wikiPageWikiLink Red_beds.
• Nankoweap_Formation wikiPageWikiLink Ripple_marks.
• Nankoweap_Formation wikiPageWikiLink Salt.
• Nankoweap_Formation wikiPageWikiLink Sandstone.
• Nankoweap_Formation wikiPageWikiLink Schist.
• Nankoweap_Formation wikiPageWikiLink Sediment.
• Nankoweap_Formation wikiPageWikiLink Sedimentary_rock.
• Nankoweap_Formation wikiPageWikiLink Sedimentary_structures.
• Nankoweap_Formation wikiPageWikiLink Shale.
• Nankoweap_Formation wikiPageWikiLink Siderite.
• Nankoweap_Formation wikiPageWikiLink Silt.
• Nankoweap_Formation wikiPageWikiLink Siltstone.
• Nankoweap_Formation wikiPageWikiLink Soft-sediment_deformation_structures.
• Nankoweap_Formation wikiPageWikiLink Southwest_United_States.
• Nankoweap_Formation wikiPageWikiLink Southwestern_United_States.
• Nankoweap_Formation wikiPageWikiLink Strata.
• Nankoweap_Formation wikiPageWikiLink Stratigraphy.
• Nankoweap_Formation wikiPageWikiLink Stratum.
• Nankoweap_Formation wikiPageWikiLink Subaerial.
• Nankoweap_Formation wikiPageWikiLink Syncline.
• Nankoweap_Formation wikiPageWikiLink Tanner_Graben.
• Nankoweap_Formation wikiPageWikiLink Tapeats_Sandstone.
• Nankoweap_Formation wikiPageWikiLink Unconformity.
• Nankoweap_Formation wikiPageWikiLink Unkar_Group.
• Nankoweap_Formation wikiPageWikiLink Uranium-lead_dating.
• Nankoweap_Formation wikiPageWikiLink Vein_(geology).
• Nankoweap_Formation wikiPageWikiLink Vishnu_Basement_Rocks.
• Nankoweap_Formation wikiPageWikiLink Zircon.
• Nankoweap_Formation wikiPageWikiLinkText "Nankoweap Formation".
• Nankoweap_Formation caption "Venus Temple landform, NNW of Lipan Point ; tilted Nankoweap Formation above tilted Cardenas Basalt, above Dox Formation.".
• Nankoweap_Formation country Southwest_United_States.
• Nankoweap_Formation country Southwestern_United_States.
• Nankoweap_Formation extent "Grand Canyon, Colorado River region".
• Nankoweap_Formation hasPhotoCollection Nankoweap_Formation.
• Nankoweap_Formation imagesize "295".
• Nankoweap_Formation namedby "Van Gundy , Van Gundy , and Maxson".

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