Research Geologist
Email:
ahudson@usgs.gov
Office Phone:
303-236-7699
Fax:
303-236-5349
ORCID:
0000-0002-3387-9838
Location
P.O. Box 25585
Denver Federal Center
Lakewood
, CO
80225-0585
US
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During November 2018, the Camp Fire burned more than 150,000 acres in Butte County, California. The fire was the deadliest and most destructive in California history, destroying more than 18,000 structures and causing at least 85 fatalities. The U.S. Geological Survey sampled surface water in areas affected by the Camp Fire, plus an unburned control site, during two post-fire sampling events, January 21-23, 2019 and February 28 - March 1, 2019. During each of those two sampling events, surface-water samples were collected at 8 stream locations. These 16 water samples were filtered using filters with multiple pore sizes (1.2 µm, 0.8 µm, 0.45 µm, and 0.22 µm) to evaluate colloid transport of trace elements. The filtrates...
Categories: Data;
Tags: Butte County,
California,
Environmental Health,
Geochemistry,
Land Use Change, All tags...
USGS Science Data Catalog (SDC),
Water Quality,
boundaries,
fires,
runoff,
soil chemistry,
surface water quality,
suspended material (water), Fewer tags
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The dataset consists of geochemical and isotopic data from fine-grained sediments and glendonite crystals collected at Carter Creek on the North Slope of Alaska. Total Organic Carbon (TOC) values in the measured section were found to range between 0.5 and 3.5%, with a shift towards lower values in the uppermost 5 m of the section. Stable isotopes (13C) in organic matter were relatively stable throughout the section, ranging between -25.5 and -26, with a slight 0.3 per mil positive shift within this range approximately 57 m from the base of the section. Glendonites themselves were analyzed for δ13Ccarb and δ18Ocarb, with δ18O values relatively consistent between -0.22 and +1.28, and a much wider range of δ13C values...
Categories: Data;
Tags: Alaska,
Arctic,
Carter Creek,
Colville Foreland Basin,
Energy Resources, All tags...
Geochemistry,
North Slope,
Oligocene,
USGS Science Data Catalog (SDC),
calcite,
glendonite,
ikaite,
isotope,
mineralogy,
raman,
sedimentology, Fewer tags
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Archaeologists and researchers in allied fields have long sought to understand human colonization of North America. Questions remain about when and how people migrated, where they originated, and how their arrival affected the established fauna and landscape. Here, we present evidence from excavated surfaces in White Sands National Park (New Mexico, United States), where multiple in situ human footprints are stratigraphically constrained and bracketed by seed layers that yield calibrated radiocarbon ages between ~23 and 21 thousand years ago. These findings confirm the presence of humans in North America during the Last Glacial Maximum, adding evidence to the antiquity of human colonization of the Americas and providing...
Categories: Data;
Tags: Chihuahuan Desert,
Climatology,
Hydrology,
New Mexico,
Paleolake Otero, All tags...
White Sands National Park,
White Sands National Park,
footprints,
last glacial maximum,
radiocarbon dating, Fewer tags
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Denali National Park and Preserve (DENA), located in central Alaska, is home to iconic and dynamic landscapes surrounding the tallest mountain range in North America, the Alaska Range. DENA preserves over 6 million acres of wild land that provides opportunities for recreation, subsistence hunting and gathering, preservation of cultural resources, and scientific research. Despite its size and popularity, DENA has only one road—the dead-end, 92-mile Denali National Park Road (hereafter referred to as the Park Road). The Park Road is mostly gravel; only the first 15 miles are paved. It is the only access for most DENA infrastructure, including visitor centers, staff facilities, campgrounds, and businesses. The Park...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Alaska,
Alaska Range,
Browne glaciation,
Cantwell Basin,
Cantwell Formation, All tags...
Climatology,
Denali,
Denali National Park,
Denali National Park,
Denali Park Road,
Denali fault system,
Dry Creek glaciation,
East Fork Toklat River,
Eilson Visitor Center,
Fang Mountain,
Geography,
Geologic Map,
Geomorphology,
Glaciology,
Healy glaciation,
Highway Pass,
Hines Creek,
Hines Creek fault,
Kantishna Hills,
McKinley River,
Mount Galen,
Mount Healy,
Mount Margaret,
Mount Wright,
Muldrow glacier,
Nenana Gravel,
Nenana River,
Park Road fault,
Plains of Murie,
Polychrome Pass,
Pretty Rocks,
Quaternary deposits,
Riley Creek glaciation,
Sable Pass,
Sanctuary River,
Savage River,
Sedimentology,
Seismology,
Stony Pass,
Stratigraphy,
Structural Geology,
Surficial Geology,
Teklanika Formation,
Teklanika River,
Teklanika volcanics,
Toklat River,
USA,
USGS Science Data Catalog (SDC),
United States,
Usibelli Group,
Volcanology,
Wonder Lake,
landslides,
neotectonics,
permafrost, Fewer tags
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USGS Geochron is a database of geochronological and thermochronological dates and data. The data set contains published ages, dates, analytical information, sample metadata including location, and source citations. The following analytical techniques are represented in the data set: 40Ar/39Ar, K-Ar, U-Th-Pb, Sm-Nd, Rb-Sr, Lu-Hf, fission track, luminescence, U-series, (U-Th)/He, Re-Os, 10Be and 26Al cosmogenic, and radiocarbon. This data set incorporates data previously hosted in the National Geochronological Database (Sloan and others, 2003), as well as data from published journal articles and ScienceBase data releases. These data are primarily from the United States, but data from other parts of the world are also...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service;
Tags: (U-Th)/He,
40Ar/39Ar,
Fission track,
Geochronology,
Geochronology, All tags...
K-Ar,
Lu-Hf,
Optically stimulated luminescence,
Radiometric dating,
Re-Os,
Sm-Nd,
Thermochronology,
U-Th-Pb,
U-series,
USGS Science Data Catalog (SDC),
geoscientificInformation, Fewer tags
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