Filters: Tags: Bedrock (X) > Types: Citation (X)

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Controls of Bedrock Geochemistry on Soil and Plant Nutrients in Southeastern Utah The cold deserts of the Colorado Plateau contain numerous geologically and geochemically distinct sedimentary bedrock types. In the area near Canyonlands National Park in Southeastern Utah, geochemical variation in geologic substrates is related to the depositional environment with higher concentrations of Fe, Al, P, K, and Mg in sediments deposited in alluvial or marine environments and lower concentrations in bedrock derived from eolian sand dunes. Availability of soil nutrients to vegetation is also controlled by the formation of secondary minerals, particularly for P and Ca availability, which, in some geologic settings, appears closely related to variation of CaCO3 and Ca-phosphates in soils. However, the results... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecosystems, bedrock, desert, foliar, nutrient, All tags... soil, stoichiometry, Fewer tags Lithology - Nutrient Source Data This workbook summarizes geochemical data for each lithology contained within the USGS Preliminary Integrated Geologic Map Databases for the United States (Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272). The summarized geochemical data contained in the “Lith Summary” spreadsheet (tab) is used to translate lithologies in state geologic maps into maps of continuous chemical characteristics (see Geochemical and Geophysical Characteristics of the Conterminous United States, http://dx.doi.org/10.5066/F7X0653P). Full details of the data are provided in the “ReadMe” spreadsheet at the beginning of the workbook. Categories: Data; Types: Citation; Tags: Bedrock, Geochemical, Geology Geophysical Characteristics of the Conterminous United States: Hydraulic Conductivity (µm/s) This raster depicts the percentage of lithological the hydraulic conductivity (in micrometers per second) of surface or near surface geology. We derived these rasters by calculating the average conductivity for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, Map Service; Tags: Bedrock, Conterminous U.S., Geology, Geophysical, hydraulic conductivity Detailed geologic mapping geodatabase for the Blue Ridge Parkway in Virginia with station point photographs The US Geological Survey, in cooperation with the National Park Service, mapped 35 7.5-minute quadrangles, within a 2-mile-wide+ corridor centered on the Parkway, from BLRI (Blue Ridge Parkway) Mile Post (MP) 0 near Afton, Virginia southward to MP 218 at Cumberland Knob, approximately 1.3 km south of the Virginia – North Carolina State Line. Detailed bedrock geologic mapping for this project was conducted at 1:24,000-scale by systematically traversing roads, trails, creeks, and ridges within and adjacent to the 2-mile-wide+ corridor along the 216.9-mile length of the BLRI in Virginia. Geologic data at more than 23,000 station points were collected during this project (September 2009 – February 2014), with approximately... Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Adney Gap, Air Bellows Gap, Alligator Back Formation, Antietam Formation, Ashe Formation, All tags... Ashville, Bald Mountain, Balsam Gap, Beacon Heights, Bear Den, Bear Mountain Gap, Bearwallow Gap, Bedrock, Beech Gap, Beetree Gap, Benge Gap, Big Island, Big Witch Gap, Biltmore Estate, Blackhorse Gap, Blowing Rock, Blue Ridge Music Center Visitor Center, Blue Ridge Park Visitor Center and Park Headquarters, Blue Ridge Parkway, Bluff Mountain, Bottom Creek Metagranitoid Suite, Buck Creek Gap, Buena Vista, Bull Gap, Carbonate, Cherokee, Cherokee Indian Reservation, Chestoa View, Chilhowee Group, Cold Mountain, Conococheague Formation, Crabtree Falls, Crabtree Faults, Craggy Gardens Visitor Center, Craven Gap, Crossnore, Crossnore Plutonic Suite, Cumberland Knob, Daniel Boone's Trace, Deep Gap, Devils Backbone Overlook, Devils Courthouse, Diabase, Doughton Park, E.B. Jeffress Park, Elbrook Formation, Elk Pasture Gap, Ervin, Ervin, Fallingwater Cascades, Fancy Gap, Flat Rock, Folds, Formation, Fox Hunters Paradise, Geology, George Washington National Forest, Gillespie Gap, Glendale Springs, Gneiss, Graggy Dome, Grandfather Mountain, Grandfather Mountain State Park, Granite, Graveyard Fields, Great Valley Overlook, Green Knob, Greenstone Trail, Groundhog Mountain, Hampton Formation, Harpers Formation, Hawksbill Mountain, Hominy Creek, Humpback Mountain, Humpback Rocks Visitor Center, Indian Gap, Irish Gap, James River, James River Visitor Center and Canal, Jefferson National Forest, Julian Price Memorial Park, Jumpinoff Rock, Lake Powhaten, Laurel Springs, Lineville River, Linville, Linville Falls, Linville Falls Visitor Center, Little Switzerland, Looking Glass Rock Overlook, Lynchburg Group, Mabry Hill, Martinsburg Formation, McKinney Gap, Meadows of Dan, Mesoproterozoic gneisses of the Fries Thrust Sheet, Metabasalt, Metagranitoid, Moses H. Cone Memorial Park and Visitor Center, Mount Jefferson State Park, Mount Mitchell, Mount Mitchell State Park, Mount Pisgah, Museum of North Carolina Minerals Visitor Center, N&W Railroad Overlook, Nantahala National Forest, Normal Fault, North Carolina, North Carolina Arboretum, Northwest Trading Post, Oconalufte Visitor Center, Onion Mountain Overlook, Orchard Gap, Oteen, Otter Creek, Overmountain Victory Nation Historic Trail, Peach Bottom Mountain, Peaks of Otter Metagranitoid, Peaks of Otter Visitor Center, Petites Gap, Pilot Gneiss, Pineola, Pipers Gap, Pisgah National Forest, Poor Mountain, Powell Gap, Price Lake, Puckett Cabin, Purgatory Overlook, Rakes Millpond, Ravens Roost, Reverse Fault, Richland Balsam, Roanoke Mountain, Roanoke River, Roanoke River Gorge, Roanoke Valley Overlook, Rocky Knob, Rocky Knob Visitor Center, Sandy Creek Gneiss, Shady Dolomite, Sharp Top, Sherando Lake, Skyland, Southern End, Staunton River, Stone Mountain State Park, Structure, Sugarloaf Mountain, Swannanoa River, Swift Run Formation, Table Rock Mountain, Terrapin Mountain, The Lump, The Saddle, Thrust Fault, Tunnel Gap, Twenty Minute Cliff, Tye River, Tye River Gap, USGS Science Data Catalog (SDC), Unicoi Formation, Virginia, Virginia Explore Park and Visitor Center, Volunteer Gap, Wagon Road Gap, Watauga River, Waterrock Knob Visitor Center, Wayneboro Formation, Waynesboro, Wayneville, Weverton Formation, Whites Gap Overlook, Wigwarm Falls, Woodlaw, Wrights Creek, Yankee Horse Ridge, Z.B. Vance Birthplace, Fewer tags Controls of Bedrock Geochemistry on Soil and Plant Nutrients in Southeastern Utah The cold deserts of the Colorado Plateau contain numerous geologically and geochemically distinct sedimentary bedrock types. In the area near Canyonlands National Park in Southeastern Utah, geochemical variation in geologic substrates is related to the depositional environment with higher concentrations of Fe, Al, P, K, and Mg in sediments deposited in alluvial or marine environments and lower concentrations in bedrock derived from eolian sand dunes. Availability of soil nutrients to vegetation is also controlled by the formation of secondary minerals, particularly for P and Ca availability, which, in some geologic settings, appears closely related to variation of CaCO3 and Ca-phosphates in soils. However, the results... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecosystems, bedrock, desert, foliar, nutrient, All tags... soil, stoichiometry, Fewer tags Lithology - Physical Source Data This workbook summarizes geophysical data for each lithology contained within the USGS Preliminary Integrated Geologic Map Databases for the United States (Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272). The summarized geophysical data contained in the “Lith Summary” spreadsheet (tab) is used to translate lithologies in state geologic maps into maps of continuous physical characteristics (see Geochemical and Geophysical Characteristics of the Conterminous United States, http://dx.doi.org/10.5066/F7X0653P). Full details of the data are provided in the “ReadMe” spreadsheet at the beginning of the workbook. Categories: Data; Types: Citation; Tags: Bedrock, Geology, Geophysical, hydraulic conductivity, uniaxial compressive strength Detailed geologic mapping geodatabase for the Blue Ridge Parkway in Virginia The US Geological Survey, in cooperation with the National Park Service, mapped 35 7.5-minute quadrangles, within a 2-mile-wide+ corridor centered on the Parkway, from BLRI (Blue Ridge Parkway) Mile Post (MP) 0 near Afton, Virginia southward to MP 218 at Cumberland Knob, approximately 1.3 km south of the Virginia – North Carolina State Line. Detailed bedrock geologic mapping for this project was conducted at 1:24,000-scale by systematically traversing roads, trails, creeks, and ridges within and adjacent to the 2-mile-wide+ corridor along the 216.9-mile length of the BLRI in Virginia. Geologic data at more than 23,000 station points were collected during this project (September 2009 – February 2014), with approximately... Types: Citation; Tags: Adney Gap, Air Bellows Gap, Alligator Back Formation, Antietam Formation, Ashe Formation, All tags... Ashville, Bald Mountain, Balsam Gap, Beacon Heights, Bear Den, Bear Mountain Gap, Bearwallow Gap, Bedrock, Beech Gap, Beetree Gap, Benge Gap, Big Island, Big Witch Gap, Biltmore Estate, Blackhorse Gap, Blowing Rock, Blue Ridge Music Center Visitor Center, Blue Ridge Park Visitor Center and Park Headquarters, Blue Ridge Parkway, Bluff Mountain, Bottom Creek Metagranitoid Suite, Buck Creek Gap, Buena Vista, Bull Gap, Carbonate, Cherokee, Cherokee Indian Reservation, Chestoa View, Chilhowee Group, Cold Mountain, Conococheague Formation, Crabtree Falls, Crabtree Faults, Craggy Gardens Visitor Center, Craven Gap, Crossnore, Crossnore Plutonic Suite, Cumberland Knob, Daniel Boone's Trace, Deep Gap, Devils Backbone Overlook, Devils Courthouse, Diabase, Doughton Park, E.B. Jeffress Park, Elbrook Formation, Elk Pasture Gap, Ervin, Ervin, Fallingwater Cascades, Fancy Gap, Flat Rock, Folds, Formation, Fox Hunters Paradise, Geology, George Washington National Forest, Gillespie Gap, Glendale Springs, Gneiss, Graggy Dome, Grandfather Mountain, Grandfather Mountain State Park, Granite, Graveyard Fields, Great Valley Overlook, Green Knob, Greenstone Trail, Groundhog Mountain, Hampton Formation, Harpers Formation, Hawksbill Mountain, Hominy Creek, Humpback Mountain, Humpback Rocks Visitor Center, Indian Gap, Irish Gap, James River, James River Visitor Center and Canal, Jefferson National Forest, Julian Price Memorial Park, Jumpinoff Rock, Lake Powhaten, Laurel Springs, Lineville River, Linville, Linville Falls, Linville Falls Visitor Center, Little Switzerland, Looking Glass Rock Overlook, Lynchburg Group, Mabry Hill, Martinsburg Formation, McKinney Gap, Meadows of Dan, Mesoproterozoic gneisses of the Fries Thrust Sheet, Metabasalt, Metagranitoid, Moses H. Cone Memorial Park and Visitor Center, Mount Jefferson State Park, Mount Mitchell, Mount Mitchell State Park, Mount Pisgah, Museum of North Carolina Minerals Visitor Center, N&W Railroad Overlook, Nantahala National Forest, Normal Fault, North Carolina, North Carolina Arboretum, Northwest Trading Post, Oconalufte Visitor Center, Onion Mountain Overlook, Orchard Gap, Oteen, Otter Creek, Overmountain Victory Nation Historic Trail, Peach Bottom Mountain, Peaks of Otter Metagranitoid, Peaks of Otter Visitor Center, Petites Gap, Pilot Gneiss, Pineola, Pipers Gap, Pisgah National Forest, Poor Mountain, Powell Gap, Price Lake, Puckett Cabin, Purgatory Overlook, Rakes Millpond, Ravens Roost, Reverse Fault, Richland Balsam, Roanoke Mountain, Roanoke River, Roanoke River Gorge, Roanoke Valley Overlook, Rocky Knob, Rocky Knob Visitor Center, Sandy Creek Gneiss, Shady Dolomite, Sharp Top, Sherando Lake, Skyland, Southern End, Staunton River, Stone Mountain State Park, Structure, Sugarloaf Mountain, Swannanoa River, Swift Run Formation, Table Rock Mountain, Terrapin Mountain, The Lump, The Saddle, Thrust Fault, Tunnel Gap, Twenty Minute Cliff, Tye River, Tye River Gap, Unicoi Formation, Virginia, Virginia Explore Park and Visitor Center, Volunteer Gap, Wagon Road Gap, Watauga River, Waterrock Knob Visitor Center, Wayneboro Formation, Waynesboro, Wayneville, Weverton Formation, Whites Gap Overlook, Wigwarm Falls, Woodlaw, Wrights Creek, Yankee Horse Ridge, Z.B. Vance Birthplace, Fewer tags Bedrock contours underlying the alluvium of the Lower Arkansas River Valley, Southeast Colorado Contours (20-foot interval) showing altitude of the bedrock surface in feet above NGVD 29 underlying the alluvium in the Lower Arkansas River Valley, Southeast Colorado. Source contours scale was 1:62,500. All digitizing and geoprocessing was done using ArcGIS Desktop v10 (Environmental Systems Research Institute, 2011) Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas River, Bent County, Crowley County, Otero County, Prowers County, All tags... Pueblo County, bedrock, hydrogeology, Fewer tags Geochemical Characteristics of the Conterminous United States: % MgO This raster depicts the percentage of lithological magnesium oxide (MgO) content in surface or near surface geology. We derived these rasters by calculating the average percent MgO content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, Magnesium, All tags... MgO, Fewer tags Geochemical Characteristics of the Conterminous United States: % Al2O3 This raster depicts the percentage of lithological aluminum oxide (Al2O3) content in surface or near surface geology. We derived these rasters by calculating the average percent Al2O3 content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Al2O3, Aluminium, Bedrock, Conterminous U.S., Geochemistry, All tags... Geology, Fewer tags Geophysical Characteristics of the Conterminous United States: Uniaxial Compressive Strength (MPa) This raster depicts the percentage of lithological the compressive strength, measured as uniaxial compressive strength (in megaPascals, MPa) of surface or near surface geology. We derived these rasters by calculating the average strength for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, Map Service; Tags: Bedrock, Conterminous U.S., Geology, Geophysical, Rock Strength, All tags... UCS, Uniaxial Compressive Strength, Fewer tags Geochemical Characteristics of the Conterminous United States: % Nitrogen This raster depicts the percentage of lithological nitrogen (N) content in surface or near surface geology. We derived these rasters by calculating the average percent N content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from Soller et... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, nitrogen Geochemical Characteristics of the Conterminous United States: % Sulfur This raster depicts the percentage of lithological sulfur (S) content in surface or near surface geology. We derived these rasters by calculating the average percent S content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from Soller et al.... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, sulfur Investigation of in situ weathering of quartz diorite bedrock in the Rio Icacos basin, Luquillo Experimental Forest, Puerto Rico The Rio Icacos basin, in Puerto Rico, is the site of the highest measured chemical solute fluxes for a catchment on granodiorite; this is partly attributable to high annual rainfall (4300 mm), high average temperature (23 °C), and moderate relief. The bulk of these fluxes is contributed by dissolution of plagioclase and amphiboles in zones of partially weathered rock (0.5–1.5 m thick) underlying saprolite. These zones are characterized by systems of onion-skin “rindlets” (each 3–10 cm thick) in which porosity development is dominated by weathering of plagioclase to kaolinite. Fe-bearing aluminosilicate minerals hornblende, augite, and biotite persist in the weathered rock after plagioclase has weathered to completion,... Categories: Publication; Types: Citation; Tags: Bedrock, Solute flux, weathering Geochemical Characteristics of the Conterminous United States: % P2O5 This raster depicts the percentage of lithological phosphorus pentoxide (P2O5) content in surface or near surface geology. We derived these rasters by calculating the average percent P2O5 content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, P2O5, All tags... Phosphorus, Fewer tags Geochemical Characteristics of the Conterminous United States: % SiO2 This raster depicts the percentage of lithological silicon dioxide (SiO2) content in surface or near surface geology. We derived these rasters by calculating the average percent SiO2 content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, SiO2, All tags... Silica, Fewer tags The ecohydrology of roots in rocks Large portions of the world are characterized by shallow soil underlain by weathered bedrock or cemented soil horizons. The implications of this substrate condition for ecohydrological processes have not been systematically explored, but misrepresentation in models could have profound consequences for climate prediction and global vegetation modelling. An issue of particular uncertainty is the characterization of water storage for these regions. A limited number of case studies have shown that plant water uptake is not restricted to shallow soils but can involve uptake from rock layers below. The mechanisms governing root?rock interactions are only beginning to be investigated. Research is needed to further characterize... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecohydrology, bedrock, deep roots, karst, soil water storage Geologic versus wildfire controls on hillslope processes and debris flow initiation in the Green River canyons of Dinosaur National Monument As in many areas of high relief, debris flows are an important process linkage between hillslopes and the Green River in the canyons of the eastern Uinta Mountains, yet the physical conditions that lead to debris flow initiation are unknown. A recent episode of enhanced debris-flow and wildfire activity provided an opportunity to examine the geomorphic impact of fire and the processes by which weathered bedrock is transported to the Green River. Field investigations and analysis of elevation and precipitation data were undertaken in 15 catchments with recent debris flows to determine how surficial geology, wildfire, topography, bedrock strength, and meteorology influence hillslope processes. The recent debris flows... Categories: Publication; Types: Citation, Journal Citation; Tags: Geomorphology, Green River, bedrock, debris flow, eastern Uinta Mountains, All tags... wildfire, Fewer tags Geochemical Characteristics of the Conterminous United States: % Na2O This raster depicts the percentage of lithological sodium oxide (Na2O) content in surface or near surface geology. We derived these rasters by calculating the average percent Na2O content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, Na2O, All tags... Sodium, Fewer tags Geochemical Characteristics of the Conterminous United States: % CaO This raster depicts the percentage of lithological calcium oxide (CaO) content in surface or near surface geology. We derived these rasters by calculating the average percent CaO content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, CaO, Calcium, Conterminous U.S., Geochemistry, All tags... Geology, Fewer tags 1 2 »