Mineralogy and Geology. 403 
ata great number of localities, angiospermous leaves, consisting 
_of some of the species obtained by Dr. Hayden, with many others, 
: ‘bed j od 
Ey as Dr. Hayden 
_ done, I obtained these leaves from the sandstones overlaid by cal- 
| are 
B 
_ first discovered, and was able to obtain them at nearly every _. 
4 y 
; the true position first taken by us in regard to the age of 
_the beds which furnish these leaves, the flora hey. represented was 
ana, Proteoides grevillieformis, P. acuta, ee daphnogenoides, 
omeda. j pre- 
an 
Diospyros 
Capellinit and 
y own observations prove this richness still more clearly, 
Thave said, in the outcrops of the lower Cretaceous rocks 
$ 
ern margin of the continent it is well known that 
eous strata are quite largely go le having been 
in Sonora, California, Oregon, Washington Territory 
