IGB

Connexion

(Article of periodic en Anglais - 1981)

Document title

Stratigraphy of late Quaternary estuarine deposits and amino acid stereochemistry of oyster shells beneath San Francisco Bay, California

Authors(s) and Affiliation(s)

ATWATER B. F. ; ROSS B. E. ; WEHMILLER J. F. ;

Abstract

The sequence of Quaternary deposits beneath the floor of San Francisco Bay includes four to seven noncontemporaneous estuarine units intercalated with alluvium and dune sand. Units L (010,000 B.P.), M (>40,000 B.P., probably ca. 80,000140,000 B.P.), and N (older than unit M) are distinctly superposed. The dominant molluscan fossil in each of these three units is Ostrea lurida Carpenter, the native oyster along much of the Pacific Coast of North America, enantiomeric ratios in O. lurida imply that (1) unit M is the same approximate age as estuarine terrace deposits bordering San Pablo Bay and Carquinez Strait, providing that the terrace deposits have been at diagenetic temperatures 12C warmer than unit M| and (2) the age of unit N is about four times greater than that of unit M, providing that both units have been at the same approximate diagenetic temperature.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1981, vol. 16, no2 [pp. 181-200]

Bibliographic references : 63 réf.

Language

Anglais

Refdoc record number (ud4) : 12539604 : Permanent link - XML version
Powered by Pxxo