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The total amount of Hg discharged into Clear Lake over the past 15,000 years is estimated to be at least 2,400 metric tons." [57] [58] [59] The EPA-funded research by UC Davis found that total levels of mercury (TotHg) in the lake sediments has "not declined significantly a decade after" the remediation work in 1992 at Sulphur Bank Mine. [60]
The sediment samples taken from Clear Lake was found to have a high amount of mercury concentration, which was believed to have come about from opening of geothermal fissures during seismic activity, which released a mass of stored mercury rich elements into the lake. [10] A sample core study of the lakebed sediments determined the amount of ...
Clear Lake Volcanic Field; Highest point; Elevation: 4,724 ft (1,440 m) [1] Coordinates: 2]: Geography; Location: Lake County, California, United States: Parent range: North Coast Ranges: Topo map: USGS Kelseyville: Geology; Rock age: less than 2.1 million years [3]: Mountain type(s): lava domes, cinder cones, maars within volcanic field [2]: Last eruption: Holocene [2]: Geologic map of the ...
Clear Lake (Pomo: Lypoyomi) [2] [3] is a natural freshwater lake in Lake County in the U.S. state of California, north of Napa County and San Francisco. It is the largest natural freshwater lake wholly within the state, with 68 square miles (180 km 2 ) of surface area.
Clear Lake National Wildlife Refuge is a National Wildlife Refuge of the United States in northeastern California.It includes about 20,000 acres (81 km 2) of open water surrounded by over 26,000 acres (110 km 2) of upland bunchgrass, low sagebrush, and juniper habitat. small, rocky islands in the wetlands provide breeding sites for American white pelicans, double-crested cormorants, and other ...
The Index to Marine & Lacustrine Geological Samples is a collaboration between multiple institutions and agencies that operate geological sample repositories. The purpose of the database is to help researchers locate sea floor and lakebed cores, grabs, dredges, and drill samples in their collections.
Scotts Creek is a stream in Lake County, California, the largest tributary of Clear Lake.It rises to the south of Cow Mountain in the Mayacamas Mountains, then flows southeast towards Clear Lake, running through the fertile Scotts Valley and the seasonal Tule Lake before joining Middle Creek and flowing into the lake via Rodman Slough.
Lake-sediment cores, in particular, facilitate a more comprehensive analysis of an area because of the continual accumulation of sediment as well as other organic matter such as pollen and charcoal. Sediment cores can also be dated quite accurately, often allowing for lake histories to be reconstructed in chronological sequence.