280 



University of California. 



[Vol. 2. 



At Spanish Gulch, twelve miles southwest of Dayville, the 

 Chico Cretaceous is seen resting upon serpentine, which has the 

 appearance of being intruded into it. At the head of the gulch the 

 serpentine is separated from what was taken to be Chico conglom- 

 erate by a zone of schist and quartzite. Not far from this locality 

 there is associated with the serpentine a considerable thickness of 

 quartzite with quartz veins, which have produced some gold. 

 Limestones quite different from any seen in the Chico are also 

 exposed here. From the same neighborhood the writer obtained 

 a specimen of a granitic rock, said to form one wall of a tunnel. 



Though no direct proof can be presented, it seems probable 

 that some of the rocks associated with the serpentine at Spanish 

 Gulch are older than the Cretaceous. 



At the junction of Muddy and Currant Creeks, six miles south 

 of Clarno's Ferry, there are exposed several hundred feet of black 

 slates showing a dip of about 20 to the northeast. At the mouth 

 of Muddy Creek the cleavage of the slates runs almost east and 

 west across the obscure bedding of the formation. On several 

 occasions as parties have been passing through the region, search 

 has been made in these beds for fossils, but so far no traces of them 

 have been found. Judging from the appearance of this formation, 

 it is older than the Knoxville shales. 



Near the head of the Crooked River, south of the Blue 

 Mountains, there are said to be exposures of Palaeozoic, Triassic, 

 Jurassic, and Cretaceous formations. 



CRETACEOUS, CHICO AND KNOXVILLE. 



Exposures of Cretaceous formations are to be found at several 

 points on the western side of the basin. The.best outcrops are seen 

 at Mitchell and Spanish Gulch. At Spanish Gulch a considerable 

 thickness of conglomerate and sandstone, dipping about 30 to the 

 southwest, is found above the serpentine. Fossils are quite numer- 

 ous in this formation, and considerable collections were made at two 

 localities. All the material obtained was placed in the hands of 

 Dr. T. W. Stanton, who has kindly furnished the following report: — 



"The fossils come from two localities at Spanish Gulch, and 

 only about three-fourths of a mile apart. The larger part of the 



