358 The American Geologist. June, 1902. 
The relation to the overlying Upper Pliocene series is 
not so clearly made out. In Tick canyon, there might be add- 
ed to the type section of the Mellenia series the following: 
6. Buff gravel of Upper Pliocene; somewhat inclined to 
talse-bedding "exposed in ‘SectiOn;~.-.. «7-2 are eee 300 feet. 
It is difficult to place the exact line of division between 
the two series as there is no apparent unconformity in this 
exposure and no sharp line of division can be drawn anywhere. 
The two formations as a whole are quite unlike, the first being 
regularly bedded and the conglomerates distinct from the finer 
material, while the buff gravel is almost exclusively a gravel 
less regularly stratified than the other. The first is distinctly 
lithified and the second is not. The change from one to the 
other is effected in about 25 feet but this 25 feet contains a 
sort of transition from one to the other. The only evidence of 
non-conformity rests on broad structural grounds. 
About 3000 feet east of Lang station, a broad arm of 
Soledad canyon extends toward the northeast. It is excavated 
into the Tertiary formations and has splendid exposures. The 
ridge on the southeast side of the valley seems to be a con- 
glomerate of rather light color resting against the face of the 
older mountains, but I do not know much about this conglom- 
erate. The northwest side of the valley exposes the following 
section in ascending order; thicknesses estimated from mem- 
ory: 
1. Dull dark red conglomerate made up chiefly of dioryte, 
granite and gneiss debris with an occasional pebble or 
small boulder or vold™ aval. oe eee i ee 100 feet. 
2. Coarse sandstones and fine conglomerates (granitic de- 
bris) making a very showy appearance,................ 400 feet. 
3. Heavy conglomerates and coarse sandstones of light 
brown and buff colors; composed largely of hasic lavas. 300 feet. 
ac.) Rude - gravel: Mexposed: (5): marie Sree ener nae ee eee 100 feet. 
Nos. 1 and 2 represent a fragment of the Escondido series 
and No. 3 is the only representative of the Mellenia series 
which, two miles west, is 1700 feet thick. In tracing from one 
section to the other, I concluded that some hundreds of feet 
had been removed by erosion from the section near Lang 
before the Upper Pliocene was laid down. I do not think 
there was any great interval between the two series although 
there was a radical change in conditions. The Buff gravel 
laps past the Mellenia series on to the Ravenna dioryte south 
of Soledad canycn and the gneiss west of Mint canyon. 
———S | 
