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Abstract

Early workers in California considered the Eocene formations we recognize today to be within the upper limits of the Cretaceous System. Gabb (1864) referred beds containing Trochocyathus striatus (Gabb) and underlying coal-bearing strata to his Division “B” of the Cretaceous. In 1869 he revised his Division “B” and renamed it the Tejon Group but continued to regard this as a division within the Cretaceous. Timothy Stanton in 1895 and again in 1896 referred Gabb’s Tejon Group to the Eocene. Stanton also made a further subdivision within Gabb’s Tejon into a lower and an upper, or Tejon, horizon. The name “Martinez” was subsequently given to the strata of the lower horizon by Whitney in the preface to Gabb’s descriptions of Cretaceous and Tertiary fossils (1869). Whitney defined the term “Martinez Group” as including the beds found in the vicinity of the town of Martinez and on the northern flank of Mount Diablo. Concerning the origin of the term “Tejon,” Anderson and Hanna (1925, p. 5) have this to say:

In 1854 a portion of the Pacific Railroad Survey expedition … camped in what is now Kern County, California, in the vicinity of old Fort Tejon. The geologist of the party, W. P. Blake, made numerous excursions in the region during which some paleontologic specimens were collected. In “Canada de las Uvas”… he picked up a float boulder containing fossils and this soon passed into the hands of T. A. Conrad. Several species new to science were detected in the small collection

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