424 THE JOURNAL OF GEOLOGY. 
from the Eagle Ranch resemble those from Angel Island, but 
the number of species is greater and the state of preservation 
better in many cases. In Vol. XXXI. of the Paleontographica 
Riist gives a plate on which are figured a group of radiolaria 
from the red jasper of west Switzerland which belongs to the 
upper division of the Jurassic. A comparison of the figures on 
this plate with those in a slide from the Eagle Ranch shows a 
remarkable similarity of the forms. At least five forms in the 
slide are closely allied to those on the plate. 
It will be seen that as far as faunal evidence is concerned the 
question cannot yet be considered as satisfactorily settled. This 
much can be said, however, that the fossil remains found on the 
one hand in the jasper in different portions of the series, and in 
the slates near its base on the coast of Monterey, indicate with a 
strong degree of probability that the series as a whole is not 
older than the Jurassic and may belong to its upper division. 
Some of the forms, especially that of the /noceramus, are very 
closely allied to known Cretaceous species, so that if palzon- 
tology alone had to be relied upon the question is at present a 
puzzling one. When, however, in addition to the faunal 
evidence, there is taken into account the fact of the unconform- 
able position of the series beneath the Knoxville, the writer 
believes that its horizon can be stated with a considerable degree 
of certainty as Upper Jurassic. It may be best to add here that 
the application of the term Jurassic to this series is based on the 
fact that the Knoxville is at present considered by palzon- 
tologists as belonging to the Lowest Cretaceous. The writer 
does not wish to be understood as contending in this or in other 
articles previously published for a Jurassic series per se, but for - 
the recognition of the existence of an uncrystalline series under- 
lying the base of the Knoxville. 
Stratigraphic position of the beds at Slate’s Springs.—Litho- 
logically the strata are entirely different from any portion of the 
known Cretaceous on the Pacific coast. They are considerably 
metamorphosed and in places extremely distorted and broken. 
They stand nearly vertical and consist of alternating layers of 
