342 21ie American Geoloffist. June, 1895 
presence of plant-like cells on and in Daimonelix and the 
similar mode of growth to Taonnrvs we seem still further jus- 
tified in grouping them together. The fact that they are 
separated by a great time interval does not, in our opinion, 
militate against their being placed together in the same order. 
It is also interesting to note the occurrence in Miocene rocks 
of Switzerland of fossils so very like others of Miocene age in 
Nebraska. 
DESCRIPTION OF PLATES. 
PLATE XI. 
Figure 1. DaimoneUx circumnxilis Barbour. (After Barbour.) 
FiGUKE 2. Sections of tubules of DnimoneUx. <(, Longitudinal section: 
b, cross section. (After Barbour.) 
Figures. "Screw-stone," one-half natural size. (After Heer.) 
Figure 4. Spirophyton typum Hall. <i, Restoration of species, h, 
lower side of frond two volutions below c, which represents the upper 
side of a volution, the si.vth or seventh from the base. (After Hall.) 
PLATE XII. 
a, Spiraxis major Newb. b and c, 8. ranihdU Newb. 
A CONTRIBUTION TO THE GEOLOGY OF THE 
COAST RANGES, 
By Andrew C. Lawson. Berkeley, Cal. 
Introduction. 
During the past four j^ears the writer has given much of 
his spare time to an inqtiiry into the geology of the Coast 
ranges of California. This work has taken the form of re- 
connaissance explorations in the southern and northern por- 
tions of the state and of more detailed studies in the vicinity 
of the bay of San Francisco. A portion of the latter work has 
been done on behalf of the U. S. Geological Survey and by 
means of the excellent topographic maps which the Director 
of the Survey, at the request of the geological department of 
the University of California, caused to be made of this region. 
In the prosecution of this work the peninsula of San Fran- 
cisco has been geologically mapped and modelled on a scale 
of two inches to the mile from Lat. 37° 80' northward to the 
Golden Gate. The results of the field work have been sum- 
marized in a paper now in the hands of the Director of the 
Geological Survey for publication in his fifteenth annual re- 
