JURA-TRIAF. 539 



Mountains, Augusta Mountains, Black Butte, Como, Eastern Foothills, Eugene 

 Mountains, Flaming Gorge, Pah-Ute, Range,- Laramie Valley, West Humboldt, 

 Montezuma Range, Wahsatch, Yampa River, etc. The generalized section also 

 includes Jurassic and Triassic beds, and Trias also occurs at nearly all the above 

 named localities. In Geological Report, West of icoth Meridian of Wheeler, 

 Prof. Stevenson speaks, of Trias in Animas Park and says that in Colorado the 

 group shows no fossils and no clue can be given to its age except from the strati- 

 graphical relation to the Jurassic and Cretaceous. He describes the rocks at 

 Cafion City and Colorado Springs. 



In Vol. Ill, Supplement to Wheeler's Report, Prof. J. J. Stevenson devotes 

 ashort chapter to the Jura-Trias, to which he refers certain beds in northern New 

 Mexico between the Carboniferous and the Dakotah Cretaceous, but saw no fos- 

 sils. In Vol. IV, Report West of looth Meridian, Dr. White says that none of 

 the invertebrate fossils of the collection are properly referable to the Triassic, 

 but in the collection he refers eight pieces to the Jurassic which were collected at 

 widely separated localities in Nevada and Utah. They include one crinoid {Pen- 

 tacrinus Astericus) mentioned also in King's Report, and mollusca. 'Cope in the 

 same volume speaks of Triassic and Jurassic in New Mexico on Gallinas Creek, 

 including Dinosauria and Crocodilia, with five species of Unios described by 

 Meek^ 



In Powell's Survey of the Rocky Mountain Region, G. K. Gilbert, in the 

 Geology of the Henry Mountains, says that the sedimentary rocks in that region 

 range from the summit of the Cretaceous to the summit of the Carboniferous, and 

 refers 2930 feet to the Jura-Trias — lying between the Carboniferous and Cretace- 

 ous, and represented by sandstones with shales, colors, purple, red, white and 

 buff. Powell, in Geology of the Uinta Mountains, 1878, includes 1200 feet in 

 Flaming Gorge as Jurassic and 4000 feet of Triassic. 



Dana in his Manual of Geology, 1874, says that the Triassic has been iden- 

 tified by fossils in British Columbia, and that Upper Trias occurs at entrance of 

 Pavalonk Bay, Alaska, and are by Whitney referred to the Middle Kenper of 

 Europe. 



We now turn to the Geological Survey of Canada. In Report, 1872-3, 

 Principal J. W. Dawson assigns certain coniferous woods from Nawaimo, Van- 

 couver's Island, to the Mesozoic age ranging from Jurassic to Upper Cretaceous. 

 A plant to which he applies the name Cycadeocarpus he says is from the Lower 

 Cretaceous or Jurassic of Skidegate, Queen Charlotte Island. Mr. Jas. Richardson 

 same volume gives a section and says the fossils of certain beds are partly Jurassic 

 and partly Cretaceous. 



In Geological Survey, Canada, 1875-76, Mr. J. F. Whiteaves gives descrip- 

 tions of two Jurassic fossils and one Triassic fossil from Peace River, British 

 America. 



In Canada Geological Survey, 1876-77, Mr. J. F. Whiteaves describes Juras- 

 sic fossils from the Coast Range of British Columbia, including twenty-seven 

 species of Mollusca and one of Annelida. 



