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40Ar/39Ar Isotopic Data and Ages for Rocks from the Yukon-Tanana Upland of Eastern Alaska and the Northern Aleutian Range of South-Central Alaska 40Ar/39Ar Isotopic Data and Ages for Rocks from the Yukon-Tanana Upland of Eastern Alaska and the Northern Aleutian Range of South-Central Alaska
This dataset contains 40Ar/39Ar isotopic data and ages for rocks from the Yukon-Tanana upland of eastern Alaska and the northern Aleutian Range of south-central Alaska. The entire sample suite was collected as part of geological mapping and supporting geochemical and geochronological analysis were conducted from 2013 to 2019 by the Mineral Resources Program of the U.S. Geological Survey...
Data for Determining Age of Barrow's Goldeneye (Bucephala islandica) from External Characteristics, Alaska and Canada, 2007-2015 Data for Determining Age of Barrow's Goldeneye (Bucephala islandica) from External Characteristics, Alaska and Canada, 2007-2015
These data describe an exercise in which known age and sex class of 100 Barrow's goldeneyes (Bucephala islandica), determined by expert examination bursa and plumage, was contrasted with age and sex classes estimated from photos by trained observers.
Discharge, nutrient, and suspended sediment data for selected streams in the Lake Tahoe watershed Discharge, nutrient, and suspended sediment data for selected streams in the Lake Tahoe watershed
A time series of nutrient and mean daily discharge data were used to create models of daily concentration and loads for selected streams of the Lake Tahoe watershed. A total of 15 sites have records ranging from as early as 1972 to 2017. Nutrients in the data set include nitrate, ammonium, Kjeldahl Nitrogen, orthophosphate, and total phosphorus. Total suspended sediment concentrations...
Pre- and Post-Treatment Fuels and Vegetation Data from the Great Basin, 2006-2018 (ver. 2.0, September 2020) Pre- and Post-Treatment Fuels and Vegetation Data from the Great Basin, 2006-2018 (ver. 2.0, September 2020)
The project was conducted to study the effects of land management options. It was conducted across a regional network of sites in sagebrush communities. Using this regional network of sites allowed us to understand the thresholds between healthy and unhealthy sagebrush communities over a broad range of conditions across the Great Basin. Sites were located in sagebrush communities...
U-Pb zircon data for: Cretaceous plutonic rocks of western Glacier Bay National Park and Preserve U-Pb zircon data for: Cretaceous plutonic rocks of western Glacier Bay National Park and Preserve
In 2016, with National Park Service support, several previously undated plutons were sampled in Glacier Bay National Park and Preserve along the west side of Glacier Bay for age determinations. Geochronologic analyses were conducted to determine the ages of the plutonic rocks in the Glacier Bay area. Five samples were collected by Frederic Wilson (USGS Alaska Science Center), from Dundas...
Ecological modeling output for the Combined Operational Plan, Round 1 in the Greater Everglades, 2018-2019 Ecological modeling output for the Combined Operational Plan, Round 1 in the Greater Everglades, 2018-2019
Ecological models facilitate evaluation and assessment of alternative plans for restoring the Greater Everglades ecosystem. Modeling outputs were used in evaluations of alternative water control plans to be performed by the Combined Operational Plan (COP). The models used were: (1) Cape Sable Seaside Sparrow Marl Prairie Indicator in conjunction with (2) Cape Sable Seaside Sparrow Helper...