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- Bass_Formation abstract "The Bass Formation, also known as the Bass Limestone, is a Mesoproterozoic rock formation that outcrops in the eastern Grand Canyon, Coconino County, Arizona. The Bass Formation erodes as either cliffs or stair-stepped cliffs. In the case of the stair-stepped topography, resistant dolomite layers form risers and argillite layers form steep treads. In general, the Bass Formation and associated strata of the Unkar Group rocks 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). In addition, thick, prominent, and dark-colored basaltic sills intrude across the Bass Formation.The Bass Formation is the basal part of the Unkar Group. The Unkar Group is about 1,600 to 2,200 m (5,200 to 7,200 ft) thick and composed of, in ascending order, the Bass Formation, Hakatai Shale, Shinumo Quartzite, Dox Formation, and Cardenas Basalt. The Unkar Group is overlain in ascending order 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 Grand Canyon Supergroup, of which the Bass Formation is the lowermost formation, overlies deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks.There has been some discussion about the nomenclature of the Bass Formation. It was originally named the Bass Limestone in 1914 for Bass Canyon, where it is typically exposed. The Bass Limestone has been reclassified as the Bass Formation by geologists because it consists of heterogeneous mixtures of clastic and carbonate sedimentary strata of which dolomite is the predominant rock type and limestone is only a minor rock type. In addition, its Hotauta Member was originally designated as the Hotauta Conglomerate in 1914 as a separate unit of formation status for Hotauta Canyon. It was later included in the Bass Formation as a member where it has remained.".
- Bass_Formation thumbnail Grand_Canyon_with_Snow_4.JPG?width=300.
- Bass_Formation wikiPageExternalLink bass.htm.
- Bass_Formation wikiPageExternalLink cpa.
- Bass_Formation wikiPageExternalLink 1.
- Bass_Formation wikiPageExternalLink sumry_6701.html.
- Bass_Formation wikiPageExternalLink proddesc_20120.htm.
- Bass_Formation wikiPageExternalLink ngmdb_home.html.
- Bass_Formation wikiPageExternalLink supergroup.html.
- Bass_Formation wikiPageExternalLink 12-1.pdf.
- Bass_Formation wikiPageExternalLink www.mindat.org.
- Bass_Formation wikiPageExternalLink loc-43661.html.
- Bass_Formation wikiPageExternalLink loc-48770.html.
- Bass_Formation wikiPageExternalLink geology_manual.htm.
- Bass_Formation wikiPageExternalLink bass_limestone.shtml.
- Bass_Formation wikiPageExternalLink supergroup_formations.shtml.
- Bass_Formation wikiPageExternalLink index.cfm.
- Bass_Formation wikiPageID "38150001".
- Bass_Formation wikiPageLength "25043".
- Bass_Formation wikiPageOutDegree "143".
- Bass_Formation wikiPageRevisionID "676496908".
- Bass_Formation wikiPageWikiLink Algae.
- Bass_Formation wikiPageWikiLink Algal.
- Bass_Formation wikiPageWikiLink Argillite.
- Bass_Formation wikiPageWikiLink Argon–argon_dating.
- Bass_Formation wikiPageWikiLink Arkose.
- Bass_Formation wikiPageWikiLink Asbestos.
- Bass_Formation wikiPageWikiLink Basalt.
- Bass_Formation wikiPageWikiLink Basement_(geology).
- Bass_Formation wikiPageWikiLink Bivalve.
- Bass_Formation wikiPageWikiLink Bivalvia.
- Bass_Formation wikiPageWikiLink Breccia.
- Bass_Formation wikiPageWikiLink Bright_Angel_Trail.
- Bass_Formation wikiPageWikiLink Carbonate_rock.
- Bass_Formation wikiPageWikiLink Cardenas_Basalt.
- Bass_Formation wikiPageWikiLink Category:Geography_of_Coconino_County,_Arizona.
- Bass_Formation wikiPageWikiLink Category:Geologic_formations_of_Arizona.
- Bass_Formation wikiPageWikiLink Category:Natural_history_of_the_Grand_Canyon.
- Bass_Formation wikiPageWikiLink Category:Rock_formations_in_Arizona.
- Bass_Formation wikiPageWikiLink Chert.
- Bass_Formation wikiPageWikiLink Chlorite_group.
- Bass_Formation wikiPageWikiLink Chrysotile.
- Bass_Formation wikiPageWikiLink Clastic_rock.
- Bass_Formation wikiPageWikiLink Cobble_(geology).
- Bass_Formation wikiPageWikiLink Coconino_County,_Arizona.
- Bass_Formation wikiPageWikiLink Collenia.
- Bass_Formation wikiPageWikiLink Colorado_River.
- Bass_Formation wikiPageWikiLink Concretion.
- Bass_Formation wikiPageWikiLink Cone-in-cone_structures.
- Bass_Formation wikiPageWikiLink Conglomerate_(geology).
- Bass_Formation wikiPageWikiLink Contact_metamorphism.
- Bass_Formation wikiPageWikiLink Crystal.
- Bass_Formation wikiPageWikiLink Diagenesis.
- Bass_Formation wikiPageWikiLink Dolomite.
- Bass_Formation wikiPageWikiLink Dox_Formation.
- Bass_Formation wikiPageWikiLink Erosion.
- Bass_Formation wikiPageWikiLink Evaporite.
- Bass_Formation wikiPageWikiLink Fault_(geology).
- Bass_Formation wikiPageWikiLink Fluvial.
- Bass_Formation wikiPageWikiLink Fold_(geology).
- Bass_Formation wikiPageWikiLink Formation_(stratigraphy).
- Bass_Formation wikiPageWikiLink Fossil.
- Bass_Formation wikiPageWikiLink Garnet.
- Bass_Formation wikiPageWikiLink Geological_formation.
- Bass_Formation wikiPageWikiLink Geology_of_the_Grand_Canyon_area.
- Bass_Formation wikiPageWikiLink Gila_County,_Arizona.
- Bass_Formation wikiPageWikiLink Gneiss.
- Bass_Formation wikiPageWikiLink Graded_bedding.
- Bass_Formation wikiPageWikiLink Grand_Canyon.
- Bass_Formation wikiPageWikiLink Grand_Canyon_Supergroup.
- Bass_Formation wikiPageWikiLink Granite.
- Bass_Formation wikiPageWikiLink Great_Unconformity.
- Bass_Formation wikiPageWikiLink Hakatai_Shale.
- Bass_Formation wikiPageWikiLink Hance_Rapid.
- Bass_Formation wikiPageWikiLink Igneous.
- Bass_Formation wikiPageWikiLink Igneous_rock.
- Bass_Formation wikiPageWikiLink Inselberg.
- Bass_Formation wikiPageWikiLink Intertidal_zone.
- Bass_Formation wikiPageWikiLink Isis_Temple.
- Bass_Formation wikiPageWikiLink Jellyfish.
- Bass_Formation wikiPageWikiLink Limestone.
- Bass_Formation wikiPageWikiLink Marine_(ocean).
- Bass_Formation wikiPageWikiLink Marine_transgression.
- Bass_Formation wikiPageWikiLink Mesoproterozoic.
- Bass_Formation wikiPageWikiLink Metamorphism.
- Bass_Formation wikiPageWikiLink Mineral.
- Bass_Formation wikiPageWikiLink Monadnock.
- Bass_Formation wikiPageWikiLink Mud.
- Bass_Formation wikiPageWikiLink Mudcrack.
- Bass_Formation wikiPageWikiLink Mudflat.
- Bass_Formation wikiPageWikiLink Nankoweap_Formation.
- Bass_Formation wikiPageWikiLink North_Kaibab_Trail.
- Bass_Formation wikiPageWikiLink Oncolite.
- Bass_Formation wikiPageWikiLink Pebble.
- Bass_Formation wikiPageWikiLink Pegmatite.
- Bass_Formation wikiPageWikiLink Peneplain.
- Bass_Formation wikiPageWikiLink Petrifaction.
- Bass_Formation wikiPageWikiLink Plagioclase.
- Bass_Formation wikiPageWikiLink Quartz.
- Bass_Formation wikiPageWikiLink Quartzite.