354 The American Geologist. December, 1896 
either side the shales and sandstone f)f Knoxville age. On 
the west the latter beds appear in the form of a syneline ex- 
tending northwest and southeast, with a width of a mile and 
a hall". A dike of serpentine separates it not only from the 
ridge through which Berryessa creek runs but also from the 
mountains bordering Napa valley on the east. At the en- 
trance to the upper end of the canon slaty shale is abundant 
but farther down sandstone predominates. The strata are 
steeply inclined through nearly the whole canon and show 
strongly the etfects of shearing and fracturing. At the lower 
end of thecafion the stream makes a turn and leaves the ridge 
very obliquely, exposing regularly stratified and thin bedded 
sandstones and shale. The former contains poorly preserved 
fossils among which were specimens of Ancella. The Golden 
Gate series with green eruptives forms a prominent hill just 
north of the creek, and here the strata stand vertical and 
strike 70 degrees west of north. The Knoxville beds outcrop 
400 feet below this exposure and directly in line with the 
strike of the former rocks. The strike of the Knoxville beds 
is however directly at right angles to that of the Golden Gate 
series; they dip away at an angle of 50 degrees, the inclina- 
tion gradually becoming less down the creek. The exposures 
close to the contact are not good, but are however sufficient to 
show that there has been considerable movement. Lenticular 
masses of serpentine occupy the contact in places. 
On the south side of the creek, and nearly opposite this 
place, the road has been graded around a knob of green 
eruptive. The Knoxville sandstones surround it on three 
sides and appear in the bank above the road, lying directly 
over the eruptive mass. The bedding is nearly fiat while no 
trace of raetamorphism is to be seen. 
The relations shown in this vicinity are most conclusive of 
a non-conformity. The regular even bedding of the Knoxville 
beds, which show no traces of shearing except near the con- 
tact, is in most marked contrast with the irregular stratifica- 
tion of the older rocks. A careful search in the latter for 
fossils revealed only a few indistinct plant remains. 
The two formations w^ere followed to the southeast, for a 
number of miles, but here, as almost everywhere else in the 
Coast ranges, the stratigraphieal relations have been masked 
