Silurian strata of the Klamath Mountains, California

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ID: 308492
1960
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Abstract
A eugeosynclinal suite comprising shale, volcanic graywacke, quartz arenite, bedded chert, limestone, and tuff crops out along Willow Creek, W. of Gazelle, California. The limestone and associated interbeds of shale contain Silurian trilobites, brachiopods, and corals. The bulk of the sequence, however, consists of unfossiliferous sedimentary rocks beneath the limestone. Trilobites in the limestone belong to genera previously reported from eastern North America, but the assemblage appears most closely related to Middle and Upper Silurian faunas of Alaska and Asia. Silurian sedimentary rocks are succeeded in thrust fault contact by phyllite and semischist in the western part of the area. These metamorphic rocks have been derived from sedimentary rocks similar to those of the Silurian sequence chiefly by regional cataclastic deformation. Small bodies of diorite and quartz diorite and a large pyroxenite-peridotite pluton intrude both the sedimentary and metamorphic rocks. In addition Tertiary and/or Quaternary basalt flows and alluvium locally truncate all rocks Relatively open folds and high-angle faults generally trending N. characterize structural patterns within the sedimentary rocks in marked contrast to a complex pattern of crumpling and shearing in the strongly lineated metamorphic rocks. In addition the thrust plane is deformed by broad open folds plunging gently NW. Thus it is possible to infer at least 3 periods of diastrophism in this area.
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Authors M. Churkin, Ralph L. Langenheim
Journal american journal of science
Year 1960
DOI
10.2475/ajs.258.4.258
URL
https://ajs.scholasticahq.com/article/58815.pdf
Keywords Keywords not found

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