422 LTE MO OLANAL OLN GR OM OC NE 
irregular manner. Numerous points were found where the con- 
tact was obscured by only a few feet of débris. The Aucella 
appeared widely distributed in the shales and sandstone, but its 
stratigraphic position could not be determined because of the 
complexity of the structure. On the summit of the range between 
Morro Creek and the Arroyo Atascadero a narrow arm of the 
Knoxville shales and sandstone is folded in vertically between 
ridges:of the older series. The contact is plainly shown in the ~ 
bed of a dry arroyo. Specimens of Aucella were obtained from 
a coarse sandstone blending into a conglomerate at a point which 
was apparently the lowest portion of the beds. 
The Golden Gate series projects through the Knoxville in 
many places near the Eagle Ranch House. The former consists 
of jasper, sandstone and shale with large bodies of greenish, fine- 
grained eruptives. Absolute contacts showing an unconform- 
able superposition of the Knoxville are rare because of the. 
amount of soil everywhere present. More than a score of 
instances were noted where the contact between the two forma- 
tions was hidden by only a slight amount of soil so that a few 
hours’ work with a shovel would uncover it. The contacts 
already found, however, showing an unconformity, taken together 
with those where it is probable though not distinctly shown, and 
which would be accepted without hesitation by one thoroughly 
familiar with the two formations, establish on stratigraphic 
grounds the existence of an uncrystalline series below the Knox- 
ville. 
Faunal relations —Fossil remains characteristic of a definite 
horizon have not yet been found in the Golden Gate series. 
This is a most remarkable fact when there is taken into consid- 
eration its extent, and the amount of study which has been given 
to it. The first fossil found in rocks which the writer would 
refer to this series is the /noceramus elliotti, Gabb, from. Alcatraz 
Island, obtained by Whitney. This was considered at the time 
as positive proof of the Cretaceous age of the San Francisco 
sandstone. In the summer of 1892 the writer obtained several 
poorly preserved specimens of /noceramus from a bed of black 
