Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Unkar_Group> ?p ?o. }

• 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 ft 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. In ascending order, the Unkar Group is overlain by the Nankoweap Formation, about 113 to 150 m (371 to 490 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 Isis Temple, "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 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 wikiPageRevisionID "602720894".
• 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 Southwestern_United_States.
• Unkar_Group hasPhotoCollection Unkar_Group.
• Unkar_Group imagesize "365".
• Unkar_Group name "Unkar Group".
• Unkar_Group namedby "Walcott and Noble".
• Unkar_Group namedfor "Unkar Valley".
• Unkar_Group otherlithology "dolomite and limestone".
• Unkar_Group overlies Vishnu_Basement_Rocks.
• Unkar_Group period "Mesoproterozoic".
• Unkar_Group prilithology "sandstone, siltstone, shale, and basaltic volcanic rocks".
• Unkar_Group region "northcentral Arizona into southcentral Utah in the subsurface".
• Unkar_Group subunits "Bass Formation, Hakatai Shale, Shinumo Quartzite, Dox Formation, and Cardenas Basalt".
• Unkar_Group thickness "to".
• Unkar_Group type Formation_(stratigraphy).
• Unkar_Group underlies "Nankoweap Formation and, as part of the Great Unconformity, the Tapeats Sandstone".
• Unkar_Group unitof Grand_Canyon_Supergroup.
• Unkar_Group subject Category:Geologic_formations_of_the_United_States.
• Unkar_Group subject Category:Geology_of_Arizona.
• Unkar_Group subject Category:Grand_Canyon.
• Unkar_Group comment "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 ft 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.".
• Unkar_Group label "Unkar Group".
• Unkar_Group sameAs m.0jwr9ls.
• Unkar_Group sameAs Q7896940.
• Unkar_Group sameAs Q7896940.
• Unkar_Group wasDerivedFrom Unkar_Group?oldid=602720894.
• Unkar_Group depiction Comanche_Point,_on_the_South_Rim_of_the_Grand_Canyon.jpg.
• Unkar_Group isPrimaryTopicOf Unkar_Group.