322 The American Geologist. May, isos 
main coast range to San Francisco ba}-. The litliological features 
of the series were quite constant the whole distance, sandstone, 
slate and banded jasper predominating. The eflfects of intense 
dj'namical action, resulting in crushed and contorted strata, and 
secondary silicification, in which these strata were filled with a 
network of minute quartz veins, were seen to be constant and dis- 
tinguishing features. With the exception of fossils of probable 
Paleozoic age from western Tehama county, none were found in 
this older series." The age of the metamorphic series is here 
definitely stated to be Paleozoic. 
On page 76 the author writes: "As far as I can learn, but 
two specimens of fossils have been found in the metamorphic 
rocks of the central coast ranges. One was an Inoceramus, pre- 
sented to the old state survey b3' Major Elliot, who found it on 
Alcatraz island, San Francisco bay." This Inoceramus was iden- 
tified by Dr. Gabb, paleontologist of the California survey, who 
named it after the discoverer. Dr. Gabb seems to have had no 
doubt of the fossil being an Inoceramus. It is figured and de- 
scribed in the Paleontology of California, vol. 2. 
According to the edition of 1889 of Nicholson and Lj'dekker's 
Paleontology, this genus is confined to the Mesozoic. Mr. Fair- 
banks disposes of this evidence of the age of the sandstone of Al- 
catraz island in the following manner; 
"A close examination of the island has recently been made, but 
no traces of an}' molluscan remains have been found. The sand- 
stone of the island is identical with that of the mainland both 
north and south, which I hold to be pre-Cretaceous. * * * 
The specimen from Alcatraz island was not in good condition, 
and I think there is room for doubt concerning the correct deter- 
mination of this fossil." 
The author writes further on page 77: "The other fossil 
which has been made use of to determine the Cretaceous age of 
the coast ranges is a supposed Aucella from the Santa Lucia 
range, a little east of San Luis Obispo.* It was found b}^ Mr. 
Turner while gathering material for the report on the quicksilver 
deposits of the Pacific coast. In 'Correlation Papers,'! Creta- 
ceous, Dr. White speaks of the most southerly known localit}' of 
the Aucella as near pai*allel 37 degrees 30 minutes north latitude, 
*Geology of the Quicksilver Deposits, p. 381. 
fBuIl. U. S. Geol. Survey, No. 82. 
