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View east toward flood-damaged travertine pools below Havasu Falls, Havasu Creek, Cataract Canyon.
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.
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.
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...
These data consist of species relative cover, percent cover of dead plant material, percent cover of soil and rock, and a variety of broad - and local- scale environmental variables. These data relate to sample sites along the Colorado River through Grand Canyon between Lees Ferry and river mile 245. The plant and ground cover data included here were originally collected as a part of annual vegetation monitoring by Grand Canyon Monitoring and Research Center. Environmental variables were either recorded in the field or obtained through other data sources. Species and ground cover data were collected in August and September 2014 at 96 randomly selected sample sites that were approximately evenly distributed along...
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...
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).
Riparian vegetation data used for comparing sampling methods along the Colorado River, Grand Canyon, Arizona
These data were collected as part of a methodologial comparison for collecting riparian vegetation data. Two common methods for collecting vegetation data were used: line-point intercept and 1m2 ocular quadrats (visual cover estimates). At each site and transect, both methods were used to collect cover and composition data by four different observers. The same transects and quadrats were utilized for both methods and all observers. Field data collected included percent cover for total living foliar cover, each plant species encountered, litter, dead plant material that is still standing, and ground cover features (biological soil crust, rock, sand, and fine soil particles). Line-point intercept data were collected...
Aerial view west toward landslide of Toroweap Formation (photograph EL18) on east side of Nankoweap Mesa, about 1 mile southwest of river mile 53.5.
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.
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.
Black river-polished amphibolitic schist, west (left) bank of river mile 127.5.
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).
Cave in Woods Ranch Member of Toroweap Formation, Marble Canyon, south side of Tanner Wash, southeast of river mile 14.6.
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.
View west toward Cottonwood Spring, north wall of Redwall Limestone in Green Spring Canyon.
View northeast toward Meriwhitica Springs on travertine flats of Meriwhitica Canyon and east wall of Spencer Canyon in background with unnamed Redwall Limestone buttes.
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.
View north toward Meriwhitica Monocline from trail in Meriwhitica Canyon, about 2 miles southwest of Meriwhitica Springs. Redwall Limestone is large upper gray cliff.