134 Scientific Intelligence. 
ng ry 
Oregon to Southern California, as Lhe as isolated patches in Eastern 
Oregon and in Mexico. Except t at in Mexico, which seems to 
be an extension of one of the best known members of the Texan 
ca it is divided into four groups, as _ 8: 
e Tijon group, the modern member, the division B. 
of Pulesmiclony, vol. I, is peredior to California, It is found most 
extensively develo oped. in the vicinity of Fort Tijon and about 
artinez. From the latter sags Aad it forms an almost continuous 
belt in the Coast Ranges to Marsh’s, fifteen miles east of Mt. 
Diablo, where it sinks under the San Joaquin plain. It was also 
discovered, by the different members of the Survey, at various 
oints on the eastern face of the same range, as far south as New 
dria, and, in the summer of 1866, by Ir. Ga bb, in Mendeei 
county near Round Valley, the latter locality being the most 
northern point at which it is ae known. It is the only coal-pro- 
ducing ee in Californ 
“Thi 
fossils, the larger part peculiar to itself, while a considerable per- 
centage e is found extending below into the next gr — and several 
species still farther down into the Ohieg roup. abb con- 
siders it as the probable equivalent of the Maestricht ied of Eu- 
rope 
2d. The Martinez Group is prepay alanine to include 4 
reall of dé of small Beg ana t found at Martinez on 
rthern flank of Monte Diablo. ie as eventually wa ie to 
hills of the Sierra Nevada as far as Folsom, occurring also on the 
eastern aa of the Coast Ranges bordering the Sacramento valley, 
t Marti and again in n Orestimba Cafion in Stanislaus county. 
i hated ~ of the Cretaceous of Oregon and of the extreme 
4th. The Shasta Group i is a provisional name, proposed to include 
a series of beds of different ages, but bese h 
knowledge of the a cannot ‘yet be eparated ; it includes all 
below the Chico Gro It contains ltila: seemingly represel nt- 
ing ages from the Gav t to ce Neocomien, inclusive, and is found — 
principally in the mountains west and northwest ‘of the Sacra- 
mento Valley. Two or three of its characteristic fossils have — 
been found in the vicinity of Monte Diablo, and one of res 
species has been sent from Washington Territory, east of Puget i. 
roup contains a inte and highly characteristic series of 
re ees 
