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View north toward basalt dike (photograph EI10) in Hakatai Shale, Unkar Group, on north side of river mile 77.2, at beginning of Hance Rapids. Shinumo Sandstone forms cliff at upper edge of photograph.
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View east and upriver toward Unkar Group of rocks, Cardenas Basalt sill (black), Bass Formation (light gray), Hakatai Shale (red), unconformably below overlying Cambrian Tapeats Sandstone, from south side of river mile 134.8.
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These data were compiled during a laboratory experiment showing the turbidity response to increasing silt and clay concentration. The sediment used for the laboratory experiment was collected in the Grand Canyon study area, from the bank of the Little Colorado River, approximately 1 kilometer upstream from its confluence with the Colorado River. The sediment was passed through a 63 µm sieve to isolate the silt-and-clay-size fraction. The silt and clay was completely dried in an oven (at 105 degrees Celsius for 12 hours), weighed, mechanically disaggregated, and added in stages to a measured volume of water to calculate concentration. The sediment was kept in suspension with an electric stirrer and turbidity was...
We examined the biogeography of aquatic and semiaquatic Heteroptera (ASH) in the Grand Canyon (GC) ecoregion (GCE) on and adjacent to the southern Colorado Plateau. We report 89 ASH taxa in 86 species, 37 genera, and 14 families in the GCE, including 54 ASH taxa detected within or on the rims of GC and its major tributaries, a fauna 3.8-fold greater than previously reported. We tested 2 groups of biogeographic hypotheses to account for this high level of diversity, demonstrating an underlying pattern of mixed biogeographic affinity and strong landform-climate effects. Equal numbers of ASH taxa were derived from allochthonous (neotropical and nearctic) sources and autochthonous (range-centered) sources. A negative...
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View east from Bass Trail across river toward Precambrian Wheeler Fold on north side of river mile 108.3. Mesoproterozoic rocks including Cardenas Basalt (black rock, lower right edge of photograph), Bass Formation (white strata, left side of photograph, Wheeler Fold, bottom center, and white ledges, base of upper cliffs), Hakatai Shale (brown cliff and upper gray ledges, upper center of photograph), and Shinumo Sandstone (brown cliff, upper edge of photograph).
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View north from Esplanade Sandstone toward Forster Canyon breccia pipe (white bleached zone in Watahomigi and Manakacha Formations of Supai Group) in west wall of Forster Canyon, a half mile southwest of river mile 123.4.
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Aerial view north towards Vulcans Throne volcano in distance on north side of river mile 179.3. View in foreground is north along Toroweap Fault in lower Prospect Canyon at faulted unnamed Pleistocene cinder cone and alluvium on east side of Prospect Canyon. Mount Trumbull (Pliocene basalt) on skyline, left side of photograph.
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View southeast toward lower Supai village area of the Havasupai Reservation, from rim of Esplanade Sandstone, just south of Navajo Falls. Pliocene alluvial valley floor, Watahomigi Formation (lower slope), Manakacha Formation (large cliff), Wescogame Formation (upper slope and ledges), and Esplanade Sandstone cliff (forms inner canyon plateau).
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Cave in Woods Ranch Member of Toroweap Formation, Marble Canyon, south side of Tanner Wash, southeast of river mile 14.6.
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Aerial view northwest toward Horn Creek Rapids, river mile 90.9, showing numerous pegmatite and granite dikes in black Vishnu Schist. Inner canyon is 1,300 feet deep here.
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View northeast toward Meriwhitica Springs on travertine flats of Meriwhitica Canyon and east wall of Spencer Canyon in background with unnamed Redwall Limestone buttes.
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Aerial view north along Hurricane Fault in Two Hundred and Seventeen Mile canyon toward upper Granite Park Canyon. Redwall Limestone lower left of photograph and upper right of photograph.
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View north toward Meriwhitica Monocline from trail in Meriwhitica Canyon, about 2 miles southwest of Meriwhitica Springs. Redwall Limestone is large upper gray cliff.
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Aerial view west across Spencer Canyon toward Quaternary travertine dam in Meriwhitica Canyon (large gray cliff at canyon floor, middle part of photograph). Precambrian granite at Spencer Canyon bottom, Redwall Limestone at canyon rims.
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View west toward east wall of Grand Canyon of contacts between Redwall Limestone (upper half of cliff), dark-gray Temple Butte Formation cliff, Cambrian unclassified dolomites, and Muav Limestone from river mile 266.0.


map background search result map search result map Laboratory experiment data—turbidity response to increasing silt and clay concentration CB01. View north toward Forster Canyon breccia pipe in west wall of Forster Canyon CI39. Aerial view north towards Vulcans Throne volcano along Toroweap Fault CM05. Black river-polished amphibolitic schist CS22. View east and upriver toward Unkar Group of rocks CS37. View southeast toward lower Supai village area of the Havasupai Reservation CW89. View east toward flood-damaged travertine pools below Havasu Falls EA04. Cave in Woods Ranch Member of Toroweap Formation EF75. View east from Bass Trail across river toward Precambrian Wheeler Fold EI09. View north toward basalt dike in Hakatai Shale EL19. Aerial view west toward landslide of Toroweap Formation on east side of Nankoweap Mesa EM22. Aerial view northwest toward Horn Creek Rapids WF23. Aerial view north along Hurricane Fault in Two Hundred and Seventeen Mile canyon WF29. Calcite and other minerals in travertine vein that fills a fault plane WF38. View north toward Meriwhitica Monocline WS34. Aerial view west across Spencer Canyon toward Quaternary travertine dam in Meriwhitica Canyon WS61. View west of contacts between Redwall Limestone, Temple Butte Formation, Cambrian unclassified dolomites, and Muav Limestone WW19. View northeast toward Meriwhitica Springs on travertine flats of Meriwhitica Canyon WW27. View west toward Cottonwood Spring Laboratory experiment data—turbidity response to increasing silt and clay concentration