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Origin of conglomerate stratigraphy in the Franciscan assemblage and Great Valley sequence, northern California

Geology

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Abstract

In the northern California Coast Ranges, the forearc-basin Great Valley sequence of Late Jurassic and Cretaceous age contains three distinctive types of conglomerate; 1) chert-rich conglomerate of Tithonian to Valanginian age, 2) volcanic-rich conglomerate of mainly Valanginian age, and 3) mixed-clast conglomerate of Valenginian and younger age. All three types are found in stratigraphic sequence along the west side of the Sacramento Valley, but in three belts of outliers that overlie the Franciscan assemblage to the west, the oldest conglomerate present in each belt is progressively younger southwestward. The same three conglomerate types occur in coeval rocks of the accretionary-wedge Franciscan assemblage and show a similar southwestward progression in composition, possibly due to trench deposition of conglomerate with the same sources as the Great Valley sequence, each conglomerate type being accreted successively to the west side of the accretionary wedge. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Origin of conglomerate stratigraphy in the Franciscan assemblage and Great Valley sequence, northern California
Series title:
Geology
Volume
16
Issue:
9
Year Published:
1988
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
783
Last page:
787