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Fossil diatoms from a 177-m core (CL-80-1) taken near the center of the main basin (Upper Arm) of Clear Lake, California, provide evidence about the stratigraphie relationships, age, and environmental history of these lacustrine deposits. In general, diatom assemblages from the core are dominated by planktonic genera such as Stephanodiscus, Cyclotella, and Melosira. Shallow-water species of Fragilaria and Amphora are common and sometimes abundant. Several planktonic diatoms from the core are also found in the Kelseyville Formation, which is exposed on the southern margin of Clear Lake and is inferred to underlie the modern lacustrine deposits. The...

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