EXTENT OF THE CRETACEOUS SEA. 217 



fossiliferous strata are in part coarse conglomerates of local origin and, 

 according to the observations of Will Q. Brown, as well as of the writer, 

 are clearly unconformable to the metamorphic rocks. 



Twelve miles further in an easterly direction, near Jacksonville, and 

 elsewhere in Jackson county, < )regon, the Chico rocks, now called Horse- 

 town by Mr Stanton, rest directly with a marked unconformity on the 

 metamorphics. 



in Oregon, therefore, the evidence, although less complete, is entirely 

 in harmony with that of northern California, and we are led to the con- 

 clusion stated in the second proposition of the thesis, namely: While 

 the Sliasta-Chico series was being deposited the region was gradually 

 subsiding and the sea transgressing to the eastward in northern Cali- 

 fornia and Oregon. This subsidence continued until the sea reached the 

 western base of the Sierra Nevada, near the fortieth parallel, and all or 

 nearly all that part of California north, northwest and west of Lassen 

 peak, as well as almost the whole of Oregon, was beneath its waters. 



The occurrence of the Cretaceous in Washington, excepting that on 

 Sucia, Orcas and Ship Jack islands, near Vancouver, lias hitherto beena 

 matter of considerable doubt. Its determination has been based largely 

 upon certain casts which were supposed to have been of Baeulites. Ac- 

 cording to Willis,* the Cretaceous of northwestern Washington is com- 

 paratively thin and rests directly on metamorphic rocks, which are pre- 

 ( 'retaceous and probably of Paleozoic age. 



While in Seattle I obtained from Mr E. W. P. Guye a well-preserved 

 Baculile, which Mr Stanton determined as Baeulites chicoensis. It was ob- 

 tained on the Snoqualmie river, three miles below the falls, and shows 

 the presence of the Chico at that point. The rock is unaltered and lies 

 between the Puget group and the metamorphics. 



At the same time my attention was called to a bowlder found in Seattle ; 

 it is composed chiefly of Aucclhi and was in all probability transported 

 from the Cascade range. The rock is unaltered and closely resembles 

 some of the Aucella-bea,rmg rock about Kiddles. 



In the collection of Professor T. Condon at the state university, Eu- 

 gene, Oregon, there is a large fragment of rock f containing a multitude of 

 robust shells of Aucella. It came from Vashon island, near Tacoma. 



Dr DawsonJ reports /4Mce/Za-bearing rocks oh the Skagit north of the 

 international boundary. It is believed that they extend south into Wash- 

 ington and have furnished the bowlders referred to. 



There can be no doubt that the Shasta-Chico series is represented in 



*Tenth Census, vol. xv, 18SC, p. 761. 



t Tliis is probably the same material that Becker and White refer to in U. S. Geol. Survey 

 Monograph xiii, pp. 202, 232. 

 X Geol. Survey ot Canada, Report of Progress, 1877-78, p. 10G B. 



