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Late Jurassic ammonites from the western Sierra Nevada, California


, : Late Jurassic ammonites from the western Sierra Nevada, California. U S

The ammonites from the Jurassic strata in the western part of the Sierra Nevada represent the Callovian, Oxfordian, and the lower part of the Kimmeridgian stages of the Upper Jurassic. The upper part of the Cosumnes Formation has furnished one fragmentary ammonite indicative of a Callovian age. The lower part of the overlying Logtown Ridge Formation has furnished many ammonites of early to middle Callovian age.

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Related references

Imlay, R.W., 1961: Late Jurassic ammonites from the Western Sierra Nevada, California. Professional Papers US Geological Survey, 374D i-iv, D1-D30

Springer Robert K.; Day Howard W., 2005: Birth and death of a Late Jurassic volcanic arc terrane, western Sierra Nevada foothills, California. In the westernmost foothills of the Sierra Nevada, a Late Jurassic volcanic arc terrane covers an area over 300 km long, and up to 50 km wide. Based on our work and the pioneering studies of Clark (1964, 1975), we recognize four stratigraphic unit...

Springer Robert K.; Day Howard W., 1999: Metamorphism in the tectonic framework of a late Jurassic arc terrane, western Sierra Nevada foothills, California. Abstracts with Programs - Geological Society of America 31(6): 97

Edelman Steven H.; Sharp Warren D., 1989: Terranes, early faults, and pre-Late Jurassic amalgamation of the western Sierra Nevada metamorphic belt, California. Geological Society of America Bulletin 101(11): 1420-1433

Tuminas A.C.; Moores E.M., 1982: Sedimentology and possible paleotectonic setting of a Late Jurassic flysch sequence in the western foothills of the northern Sierra Nevada, California. Abstracts with Programs - Geological Society of America 14(4): 241

Schweickert R.A., 1978: Triassic and Jurassic paleogeography of the Sierra Nevada and adjacent regions, California and western Nevada. Pacific Coast Paleogeography Symposium 2): 361-384

Newton M.Claiborne I.I., 1986: Late Jurassic left-lateral transpression along the western North American margin, with structural evidence from the Southern Foothills Terrane, Sierra Nevada, California. Abstracts with Programs - Geological Society of America 18(6): 706

Edelman S.H.; Day H.W.; Moores E.M., 1983: The Nevadan Suture, northern Sierra Nevada, California; a Late Jurassic arc-continent collision. Abstracts with Programs - Geological Society of America 15(6): 565

Bogen Nicholas L.; Kent Dennis V.; Schweickert Richard A., 1985: Paleomagnetism of Jurassic rocks in the western Sierra Nevada metamorphic belt and its bearing on the structural evolution of the Sierra Nevada Block. JGR: al of Geophysical Research. B. 90; 6, Pages 4627-4638. 1985.

Behrman P.G.; Parkinson G.A., 1978: Paleogeographic significance of Middle to Late Jurassic sedimentary sequence, Sierra Nevada foothills, California. AAPG Bulletin 62(11, Part 1): 2349-2350