Bragdon Formalion in N. IV. California. — Ilcrshey. 355 
witliin the Bragdon area without any volcanic material separ- 
ating the two formations. The Dragdon formation in this 
region comes into the extreme northwestern corner of the Red- 
ding quadrangle of the geologic map of the United States and 
Mr. Diller has recently studied it in this territory where it 
comes directly into contact with the Paleozoic rocks, an abnor- 
tnnl nrra. So tar as T am aware. Mr. Dillor ha«;, otherwise, 
studied the fomiation merely on rapid reconnaissance trips 
which were insufficient to make him familiar \vith its true gen- 
eral structural relations with other formations. 
!\Ir. Diller says, "'■"The relation of the Bragdon formation 
upon the eastward to the Baird, appears to be that of conform- 
able stratification." He doe.i not say that he found it actually 
under the Baird formation • Probably he found outcrops of 
highly inclined Bragdon adjoining outcrops of Baird shales 
having the same strike and dip. If he found the Bragdon 
shales passing- nnrlrr the Baird shales, T would suspect over- 
turning or thrust faulting. In view of the almost overwhelm- 
ing-evidence gathered elsewhere that the Bragdon sediments 
w^ere deposited on a volcanic series which unconformaWy rests 
on stratigraphically higher Carboniferous rocks than the Baird 
shales, I suspect that the apparent conformability of the Brag- 
don and Baird formations is deceptive. 
So far I have oiily presented evidence that the Bragdon 
formation is newer than some Triassic rocks. ^Ir. F. !M. 
Anderson probably recognized that it rests directly on Triassic 
volcanic rocks and assumed its age as also Triassic. One of 
the objects of my trip of October, 1901, into the country of 
Pit river and Squaw creek v.'as to search for an equivalent of 
the Bragdon conglomerates in the Triassic and Jurassic section 
of that. region. Under instructions from Mr. Diller I was able 
to visit typical exposures of all the formations, but I found 
nothing similar to the Bragdon formation. 
The Pit formation is a sandy shale without prominent con- 
glomerates and witliout the rapid alternation of very fine and 
much coarser sediments that characterizes the Bragdon. More- 
over, it is jnterstratified with the volcanic series so that there 
is no interval between the two which might, elsewhere, be occu- 
pied by the Bragdon formation. Narrow renmants of a shale 
* Amer.Jour. Sci.. vol. xv, May, 1903, p. 352. 
