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Album caption: San Juan Co, Colo. Index card: Avalanche tracks on snow-covered mountains, viewed from Highway 550 near Silverton. San Juan Mountains. San Juan County, Colorado. February 1973.
Repeat photography samples were used to analyze how the structure and site-specific distribution of forests may or may not have changed during the past century in the San Juan Mountains, Colorado. Systematic evaluation of 146 photosets was combined with field observations to identify trends in vegetation change. Both conifers and deciduous trees (e.g., aspen) have increased in extent. Forest recovery from large disturbances that occurred during Euro-American settlement contributed substantially to this increase. Trees also encroached into grass/shrublands, but less than half of photosets show tree invasion, and invasion is more common in small grass/shrubland openings interspersed with forest than in large openings....
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This Laser ablation ICPMS U-Pb detrital zircon data set supports mapping and stratigraphic interpretations of the Upper Devonian Ignacio Formation in southwestern Colorado (Silverton area). All samples were collected from a measured stratigraphic section called "Sultan Creek South" located at 37.710010 and -107.67530 (Evans and others, 2019). The Ignacio Formation was previously interpreted as Cambrian, but evidence that it is Devonian includes reexamined fossil data and detrital zircon U-Pb geochronology. The Ignacio Formation has a stratigraphic trend of detrital zircon ages shifting from a single ca. 1.7 Ga age peak to bimodal ca. 1.4 Ga and ca. 1.7 Ga age peaks, which represents local source-area unroofing history....
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Album caption: San Juan Co, Colo. Index card: A different view of the Silver Lake Mine, Silver Lake, and Arrastra Basin, near Silverton. San Juan Mountains. San Juan County, Colorado. August 21, 1980.
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Album caption: San Juan Co, Colo. Index Card: Avalanche chute, South Fork Mineral Creek. San Juan Mountains. San Juan County, Colorado. June 1, 1972.
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Album caption: San Juan Co, Colo. Index card: A different view of the Iowa Mine and Silver Lake near Silverton. San Juan Mountains. San Juan County, Colorado. August 21, 1980.
1. There is mounting evidence that leaf litter typically decomposes more rapidly beneath the plant species it derived from than beneath the different plant species, which has been called home-field advantage (HFA). It has been suggested that this HFA results from the local adaptation of soil communities to decompose the litter that they encounter most often, which probably comes from the plant species above them. 2. To test this hypothesis and to investigate how HFA varies over time and in relation to litter quality, we performed the first detailed assessment of HFA in relation to litter decomposition. We monitored decomposition over time in two reciprocal litter transplant experiments involving three high-elevation...
This reports summarizes work and key findings to date from the Upper RIO Grande Basin SNOwfall Measurement and streamFLOW (RIO-SNO-FLOW) Forecasting Improvement Project conducted from Jan. 1, 2014 through Dec. 31, 2015. The project area was centered over the upper mainstem Rio Grande and Conejos River basins in southern Colorado. This report is organized into 7 chapters that detail the major elements of the project including; a Project Description, NOAA Gap-filling Radar, NASA Airborne Snow Observatory, In-Situ Ground Observations, Distributed Hydrologic Modeling, and Community Engagement. While several follow-on activities are still in progress, a number of conclusions and recommendations have emerged from the...
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Hydrologic reconnaissance of Mineral Creek near Silverton, Colo., was conducted from June 25-27, 2020. Both banks of Mineral Creek and the adjacent hillsides were walked, starting near the ghost town of Chattanooga and proceeding downstream to the confluence of Mineral Creek with the Middle Fork of Mineral Creek. The purpose of this reconnaissance was to identify areas of emergent groundwater on the right (EGR) and left (EGL) banks, a task that was accomplished by following observed surface flows (seeps and springs) upgradient to the point at which they emanated from the subsurface. Coordinates, using a handheld global positioning system (GPS) device, and photographs were obtained at these locations of emergent...
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Album caption: Hinsdale Co, Colo. Index card: Wood Mountain arête, elevation 13,600' feet. San Juan Mountains. Hinsdale County, Colorado. August 3, 1971.
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Album caption: Bog-Picayne Gulch. Index card: General view of Bog in Picayne Gulch. San Juan Mountains. San Juan County, Colorado. July 19, 1972.
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Album caption: San Juan Co, Colo. Index card: The U-shaped valley of Cunningham Creek. San Juan Mountains. San Juan County, Colorado. July 27, 1971.
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Album caption and index card: View to west from Handies' Peak, including view of cirque. San Juan Mountains, Colorado. Hinsdale and San Juan Counties, Colorado. June 27, 1972.
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San Juan Mountains, Colorado. Henson Creek and avalanche track. August 21, 1986.
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Album caption: Ouray Co, Colo. Index card: Gilpin Peak and arête, elevation 13,694 feet. San Juan Mountains. Ouray County, Colorady. August 14, 1971.
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This product consists of Adobe Acrobat .PDF format documents for 10surficial geologic strip maps along the Animas River watershed from itsmajor headwater tributaries, south to Durango, Colo. The Animas Riveroriginates in the San Juan Mountains north of the historic mining townof Silverton, Colo. The surficial geologic maps identify surficialdeposits, such as floodplain, and terrace gravels, alluvial fans,glacial till, talus, colluvium, landslides, and bogs. Sixteen primaryunits were mapped that included human-related deposits and structures,eight alluvial deposits, four colluvial deposits, one glacial deposit,one travertine deposit, and undifferentiated bedrock. Each of thesurficial geologic strip maps has .PDF...


map background search result map search result map San Juan Mountains, Colorado. Wood Mountain arête, elevation 13,600 feet. 1971. San Juan Mountains, Colorado. Gilpin Peak and arête, elevation 13,694 feet.1971. San Juan Mountains, Colorado. Avalanche chute on South Fork Mineral Creek. 1972. View to west from Handies Peak. San Juan Mountains. Hinsdale and San Juan Counties, Colorado. 1972. San Juan Mountains, Colorado. Bog in Picayne Gulch. 1972. San Juan Mountains, Colorado. Avalanche chutes, viewed from Highway 550 near Silverton. 1973. Silver Lake Mine and Arrastra Basin; near Silverton. San Juan Mountains. San Juan County, Colorado. 1980. Royal Tiger Mine and Silver Lake, near Silverton. San Juan Mountains. San Juan County, Colorado. 1980. Different view of the Iowa Mine and Silver Lake near Silverton. San Juan Mountains. San Juan County, Colorado. Slightly different view of the Silver Lake Mine and Silver Lake near Silverton. San Juan Mountains. 1980. Abandoned buildings at the Good Hope mine. San Juan Mountains. Hinsdale County, Colorado. 1980. Surficial geologic maps along the riparian zone of the Animas Riverand its headwater tributaries, Silverton to Durango, Colorado, withupper Animas River watershed gradient profiles Generalized Geologic Map of the Upper Animas River Watershed and Vicinity, Silverton, Colorado U-Pb detrital zircon data for: lower Paleozoic sedimentary rocks near Silverton, CO USA Hydrologic reconnaissance to identify areas of emergent groundwater, Mineral Creek, near Silverton, Colorado, June 2020 Hydrologic reconnaissance to identify areas of emergent groundwater, Mineral Creek, near Silverton, Colorado, June 2020 Generalized Geologic Map of the Upper Animas River Watershed and Vicinity, Silverton, Colorado Surficial geologic maps along the riparian zone of the Animas Riverand its headwater tributaries, Silverton to Durango, Colorado, withupper Animas River watershed gradient profiles San Juan Mountains, Colorado. Avalanche chute on South Fork Mineral Creek. 1972. San Juan Mountains, Colorado. Bog in Picayne Gulch. 1972. San Juan Mountains, Colorado. Avalanche chutes, viewed from Highway 550 near Silverton. 1973. Silver Lake Mine and Arrastra Basin; near Silverton. San Juan Mountains. San Juan County, Colorado. 1980. Royal Tiger Mine and Silver Lake, near Silverton. San Juan Mountains. San Juan County, Colorado. 1980. Different view of the Iowa Mine and Silver Lake near Silverton. San Juan Mountains. San Juan County, Colorado. Slightly different view of the Silver Lake Mine and Silver Lake near Silverton. San Juan Mountains. 1980. San Juan Mountains, Colorado. Gilpin Peak and arête, elevation 13,694 feet.1971. San Juan Mountains, Colorado. Wood Mountain arête, elevation 13,600 feet. 1971. View to west from Handies Peak. San Juan Mountains. Hinsdale and San Juan Counties, Colorado. 1972. Abandoned buildings at the Good Hope mine. San Juan Mountains. Hinsdale County, Colorado. 1980.