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Sediment magnetic, paleomagnetic and geochemical results have beenobtained from lacustrine sediments recovered in a 30-meter coretaken by rotary drilling methods at Grass Lake, Siskiyou County,California. The data have been analyzed and interpreted in termsof environmental change in the Grass Lake catchment over the pastca. 100,000 years.
Sediment magnetic and geochemical results have been obtained fromthe top 60 meters of lacustrine sediments recovered in two coresfrom Tule Lake in northern California. The sediment magnetic andgeochemical data, presented here in tabular form, complementstudies of diatoms and pollen in the cores that are the bases forpublished paleoclimatic interpretations. This report alsodocuments the methods used to obtain the magnetic properties andgeochemical data.
This map of selected post-Nevadan features is in a sensesupplementary to Map I-2148 (Geologic map of the Klamath Mountains,compiled by W.P. Irwin, 1994). The map of selected post-Nevadangeologic features is in large part a compilation of the publishedwork of many geologists (see Fig. 1--Index map showing sources ofdata). The principal focus of Map I-2148 concerned the assemblageof terranes that constitute the principal bedrock of the KlamathMountains. The terranes of the Klamath Mountains variously consistof rocks that range from Cambrian to Late Jurassic and perhaps evenearliest Cretaceous age. All of these terranes have been subjectedto episodes of metamorphism, plutonism, and tectonism, including amajor widespread...
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