J. 8. Diller — Bragdon Formation. 385 



four miles west of Baird and near the mouth of Hazel Creek. 

 It is evident, therefore, that the " Clear Creek volcanics " of 

 Hershey in the Kennet region, being earlier than the middle 

 Devonian, are not equivalent to the Bully Hill volcanics of 

 late Carboniferous and early Triassic age. The fossiliferous 

 tuffs and shales which are interstratified with the lavas of 

 " Bully Hill volcanics," showing them to be of submarine 

 eruption, are entirely lacking in the " Clear Creek volcanic 

 series." 



The general statements made in this paper apply only to the 

 type areas of the Bragdon and of the " Clear Creek volcan- 

 ics " east of Trinity Mountain, where it is believed their 

 normal relations to Carboniferous and Devonian are better 

 exposed than anywhere else in the Klamath Mountains. 



Age of the Bragdon. — The Bragdon formation is regarded by 

 Hershey as Jurassic about the horizon of the Mariposa, and he 

 has set forth his evidence in detail.* It is in part lithological 

 but largely structural, in which much stress in laid on the rela- 

 tive position of his " Clear Creek volcanics " regarded as of 

 early Triassic age, but which, as I have already shown, are in 

 part, at least, earlier than the middle Devonian. 



Upon a geological map of portions of the copper belt of 

 Shasta County, Andersonf represents the same rocks as Triassic, 

 but the circumstances of publication did not permit him to 

 present the evidence. 



A study of the areal distribution of the Bragdon and its 

 stratigraphic relation to the Carboniferous and the Devonian 

 led me several years;}: ago to refer it provisionally to the lower 

 part of the Carboniferous. Further field study has confirmed 

 me in that opinion as already set forth. Fossils recently dis- 

 covered support the same conclusions and will now be consid- 

 ered. 



Mr. James Storrs, who has collected most of the fossils for 

 my party of the Geological Survey in the Redding Quadran- 

 gle, early discovered that some of the limestone fragments of 

 the Bragdon conglomerate are fossiliferous. Fossils have been 

 collected at various times during four years from the conglom- 

 erate pebbles at twenty-one localities, chiefly along the Sacra- 

 mento and to the eastward close up to the outcrop of the Baird 

 formation, but also to the westward as far as Trinity Mountain 

 and on the northwest to within a few miles of Trinity Center. 

 These fossils were referred at first to Mr. Schuchert and later to 

 Dr. Girty, and all of them as far as determinable, with one possi- 

 ble exception found on Bailey Creek to be mentioned later, were 



* Am. Geologist, vol. xxxiii, pp. 248-256 and 347-360. 



f State Mining Bureau, Bull. 23, 1902, on Copper Resources of California. 



% This Journal, vol. xv, p. 352. 



