768 JOHN C. MERRIAM 
In a recent publication’ by Mr. T. W. Stanton the fauna and 
stratigraphy of a number of the most important of Gabb’s Mar- 
tinez localities have been clearly discussed and a complete reor- 
ganization of the hitherto heterogeneous group effected. Mr. 
Stanton has shown the Martinez of Gabb to consist of two parts, 
one characteristic Cretaceous and inseparable from the Chico 
group, the other being more closely related faunally and strati- 
graphically to the Tejon-Eocene than to the Chico. The upper 
portion was therefore placed with the Tejon and designated as 
Lower Tejon. Asa possible modification of his classification 
Mr. Stanton states that, ‘‘if more detailed field work makes it 
desirable to retain the name (Martinez) at all, it should be 
festricted to) the Hocene) (uppem)Eportion ja a 
In the following discussion the name Martinez is applied to 
”” 
that portion of Gabb’s Martinez group which remains, after the 
removal of the Chico-Cretaceous element. The writer’s state- 
ments are based on observations, extending over a period of 
several years, made in the typical region for the group, viz., that 
adjacent to the town of Martinez. 
In the hills to the southwest of Martinez strata of unques- 
tioned Chico age, containing a characteristic fauna, occur over a 
considerable area. Ina fine outcrop of compact, bluish sand- 
stone occurring on the west side of Alhambra Valley, and near 
the top of the Chico, the writer found an abundance of fossils, 
characteristic of this group, which are listed in the table below, 
under Locality No. 1.. From this point to the east and west the 
structure of the strata is anticlinal, showing an apparently con- 
formable series up as far as the Miocene on each side. 
From the standpoint of stratigraphy, one would hardly be 
disposed to find fault with Gabb’s conception of the Martinez, 
since in this, the typical locality, the Chico, Martinez, and Tejon, 
appear everywhere to be conformable, while numerous com- 
plications of the stratigraphy have still farther increased the dif- 
ficulty of separating these three groups on stratigraphic grounds. 
*The Faunal Relations of the Eocene and Upper Cretaceous on the Pacific Coast 
17th Ann. Rep. U.S. Geol. Survey, 1895-6. 
