TRIASSIC. 541 



here, the intensity of the force brought to bear on this region is well exemplified. About the 

 middle of the southwest reach of the channel, in a bay on the southeast side, are extensive 

 exposures of limestones and flaggy argillites, with general westerly dips. The limestones are 

 generally in thin beds, bluish black on fresh fracture, and frequently fetid when struck. They 

 are cherty and contain blackish rounded or rootlike concretions of sihca and blend with the 

 shales or flaggy argillites, which appear to occupy a superior position. The argUlites are 

 calcareous throughout, and generally each bed is a few inches thick, though in some cases 

 finely shaly. Fossils were found in abundance in some of the shaly layers and in the Hme- 

 stones. Mr. Whiteaves enumerates the following species from this locality. They are 

 evidently synchronous with the so-called Alpine Trias of Nevada: 



1. Amplexus (?) sp. nov. 



2. Monotis subcircularis Gabb. 



3. Halobia lommeli Wiss. 



4. Sphcera whitneyi (?) Meek. 



5. Arcestes gabbii.Meek. 



6 and 7. Fragments of two species of ammonitoid shells, one of which appears to be new. They probably 



belong to different genera. 

 8. Belemnites sp. nov. 



Feldspathic dikes, generally of pale greenish-gray color, traverse the rocks in all directions 

 and stand out like ruined walls when the softer beds have been weathered away from them. 

 These so complicate the section as to render accurate measurement impossible, but there is 

 probably 500 feet or more in thickness of the limestones and argUhtes. 



Detailed descriptions of various occurrences of so-called Triassic rocks, which 

 probably include Paleozoic rocks also, are given on the succeeding pages of Daw- 

 son's report. In 1905 Ells ^^® examined the coal fields of the northern (Graham) 

 island, but he did not investigate the pre-Cretaceous. rocks except incidentally. 



N-O 11. PEACE BIVEB PASS, BRITISH COLUMBIA. 



On Peace River, in the canyon by which it traverses the eastern ranges of the 

 Rocky Mountains, McConnell *''^* noted the presence of "dark Monotis-bearing 

 calcareous shales and impure limestones of Triassic age." This occurrence is in the 

 range of the Triassic strata on the Liard. (See O 9, pp. 542-543.) 



O 5. COOK INLET, ALASKA. 



Stanton and Martin ^^^^ describe the Triassic of Cook Inlet as follows : 



Upper Triassic rocks have been seen on the north shore of Bear Cove and on Bear Bay, 

 both on the west shore of Cook Inlet, and on the Alaska Peninsula at the entrance to Cold 

 Bay and extending several miles eastward. They are also probably present at numerous locali- 

 ties on the south shore of Kachemak Bay, as at Hahbut Cove and Seldovia, where there is a 

 great development of thin-bedded and contorted cherts, with some siliceous limestone and 

 igneous rocks. This series is tentatively correlated with the fossiliferous Trias on the west 

 shore of Cook Inlet on account of lithologic and structural resemblances and because of its 

 association with the Lower Jurassic. 



The Triassic rocks of Cold Bay, Bear Cove, and Bear Bay, whose age has been definitely 

 determined by fossils, consist of thin-bedded chert, limestone, and shale of varied colors. The 

 chert and limestone are usually dark (black, green, or dark red) when fresh, but weather to 

 lighter shades. No measurement of the thickness has been made, but it is estimated to be at 

 least 2,000 feet in the exposures seen by us, in which the base was always cut off by intruded 

 igneous rocks. 



These rocks are always closely folded and are frequently crumpled. They are usually 

 cut by numerous dikes of diverse character and composition, varying from granite to andesite 



