Geology and Mineralogy. 128 
maps and sections, there are the — plates—1 of fossil shark’s teeth 
to illustrate Agassiz’s appendix; 11 of Eocene and vGOE Tertiary 
shells, by Conrad; 1 of sankieaa of "siltoaion wood, by G. C. Schaeffer ; 
10 of new species of plants described by Dr. Toe. 
On the parts of California and Oregon explored by Lieut. R. 8. 
Wapuiean, Topo g. Eng., and Lieut. H. L, Aszorr, Topog. Eng., in 
ieee being the sixth volume of the Reports of Explorations and Surveys 
ascertain the most practicable and economical — for a railroad from 
ve Mississippi river to the Pacific Ocean.—This volume commences with 
@ pro roped 
railroad route. Among the vinteshande we find that Shasta Peak is esti- 
mated at 18,000 feet in height above the sea, and that its two pe 
“loaded with eternal snow.” It is of interest to compare with this the 
aspect in October, 1841, as sketched with minute attention to wit: position 
of the snow by J. ana, and published in this Journal, vol. vii, p, 249. 
From the amount of snow there shown, it is plain that the height is less 
than 14,000 feet. a is stated in the text that the peak was seen early in 
November, and it snowed there on the night of November 9th; whereas 
in 1841 there had ceri no snow or rain during the autumn until, the time 
of the visit. 
This Report is followed by a Geological Report by Dr. J. 8. Newserry, 
Geologist and Botanist of the Expedition. The following facts are cited 
from its pages. 
San Francisco Sandstone—The San Francisco sandstone and plein 
which in some chou pass into iniciee slate and ee rock, are ref 
to the associated 
found to place beyond doubt this of the slates and associated 
rocks to the Tertiary.—A Scutella (S. interlineaia) is washed ‘up on the 
shores, on the Pacific side of the San Francisco axis, and it is supposed 
on lithological grounds that the rock (a ccodetaney as well as the fossil- 
ifero A sae — to the eastward, is the same in age as that 
ward; it consists of sandstones overlaid — foasiliferote jades 
other san 
referable to the Miocence according to Conrad. Above the whole lies a 
horizontal io of oyster shells four feet thick, about twenty feet above 
the present water level. The oyster is a living species. The same sand- 
through the Straits of Carquines, as others 
have ribed, and occurs also about Benicia, where shark’s teeth were 
which re jasper rock near San F 
end . the ride pre is a copious spring, iebly thermal, the tempera- 
ture 80° to 90° 
