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This geologic map database is comprised of new geologic mapping, at a 1:24,000 scale, along the southern Bartlett Springs fault in the northern California Coast Ranges. The map covers an area of 258 square miles in Lake, Napa, Colusa, and Yolo counties, work was undertaken between 2016 and 2021, and supported by the USGS National Cooperative Geologic Map Program. This geodatabase contains the most up-to-date and highest resolution mapping in the region. Results and observations reported here help elucidate the geologic deformational history, as well as relationships between active older and active structures. Please consult the map pamphlet and description of map units for a detailed presentation and interpretation...
Field data for fishes sampled using bottom and surface gill nets during daylight hours in Clear Lake, California, USA. This data release includes all measured environmental parameters and fish taxa included in the analysis. First posted - December 20, 2018 (available from author) Revision - November 26, 2019 (available from author) Revision - January 21, 2022 (available from author) Revision - October 11, 2022 (available from author) Revision - September 21, 2023 (current version)
Note: This data release is currently being revised and is temporarily unavailable. Field data for vertical water quality profiles using Yellow Spring Instruments (YSI) EXO2 sondes during daylight hours in Clear Lake, California. This data release includes all measured environmental parameters included in the analysis. First release: April 13, 2019 Revised: October 29, 2019 (ver. 2.0) Revised - January 24, 2022 (version 3.0)
Categories: Data,
Data Release - Revised,
Data Release - Under Revision;
Tags: California,
Clear Lake,
Lake County,
USGS Science Data Catalog (SDC),
United States,
Note: this data release has been deprecated. Please see new data release here: https://doi.org/10.5066/P9KXAMKP. Field data for fishes sampled using bottom and surface gill nets during daylight hours in Clear Lake, California, USA. This data release includes all measured environmental parameters and fish taxa included in the analysis. First posted - December 20, 2018 (available from author) Revised - November 26, 2019 (version 2.0) Revised - January 21, 2022 (version 3.0) Revised - December 7, 2022 (Version 4.0)
Categories: Data,
Data Release - Revised;
Tags: Aquatic Biology,
California,
Clear Lake,
Fish Biology,
Hitch,
Clear Lake is a 180 km2 freshwater lake located in the California Coast Range, approximately 120 km northwest of Sacramento. The lake supports a wide variety of fish and bird species and is a very popular sport-fishing destination. However, fish consumption advisories associated with mercury (Hg) contamination exist for several popular recreational species. The lake is comprised of three main regions including a large open-water region to the northwest (North Arm), a smaller and narrower region to the southeast (South Arm), and the smallest and narrowest region to the east (Oaks Arm). The Sulfur Bank Mercury Mine (SBMM), located on the south shore of the Oaks Arm, was mined by both open-pit and underground methods...
Stable isotope compositions (the ratios deuterium/hydrogen, oxygen-18/oxygen-16, and sulfur-34/sulfur-32) are reported for alunite, jarosite, kaolinite, silica, cinnabar, marcasite, and native sulfur from outcrops in and around the workings of the Sulphur Bank mercury mine, Lake County, California, and chemical compositions are reported, from electron microprobe analyses, for alunite and buddingtonite. Isotope analyses are given also for hydrogen sulfide gas from active fumaroles and for soluble sulfate in samples of mine waste. The waste results reflect fine grained material (particles less than 0.063 millimeter in diameter) that were taken from composites, each composite representing a particular waste pile that...
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