TRIASSIC PORTION OF SHINARUMP GROUP 107 



UNCONFORMITY 



It is impossible to closely correlate Walcott's section with that 

 given by Powell for the Kanab Valley (23, p. 53), except that the con- 

 glomerate, No. 18, is clearly the Shinarump conglomerate of Powell. 

 It seems probable that No. 4 is the lowest member of the Vermilion 

 Cliff group of Powell. Assuming that to be the case, it will be seen 

 that fossil remains were found by Walcott at several horizons, in 

 the members Nos. 10, 11, and 13, all in the upper part of the section. 

 No fossils except silicified wood were noted in the lower 910 feet of 

 strata assigned to the Triassic. 



The fish remains obtained by Walcott in No. 13 of the above sec- 

 tion were, at my suggestion, submitted to Dr. C. R. Eastman for 

 examination, and he has published the following preliminary state- 

 ment concerning them in connection with a discussion of the Triassic 

 fishes of New Jersey. 



Of the few genera which are tolerably well indicated, such as Pholidophorus 

 and several Lepidoius -like forms, it cannot be said that they evince anything in 

 common with the Triassic fauna of the eastern states. Some resemblance is to 

 be noted between the Kanab fish fauna and that of Perledo, near Lake Como, 

 but the general aspect of the material collected by Walcott is much more sugges- 

 tive of Jurassic than of Triassic relations. This might very well happen notwith- 

 standing the horizon be definitely proved by stratigraphic and other evidence 

 to be of Triassic age, as other instances of pioneer faunas and overlapping types 

 are not uncommon. It does not appear, however, that the data thus far obtained 

 warrants more than a plausible supposition that the Kanab beds are of Triassic 

 age, their reddish color and relative position being consistent with what we should 

 expect of rocks of that horizon. Accepting the evidence furnished by the fossil 

 fishes at its full value, we shall have to regard the red beds of Kanab Canyon as 

 belonging presumably to the Lias (9, p. 66 and 4, p. 486). 



The invertebrates obtained by Mr. Walcott in association with 

 the vertebrates have been examined by Dr. H. W. Shimer, who has 

 kindly given me (through Dr. Eastman) a report upon them. The 

 material studied contains one indeterminable Ammonitoid fragment 

 and two representatives of the Entomostracans. Of the latter, Dr. 

 Shimer gives the following description: 



ORDER OSTRACODA 



Candona ? Roger sit Jones 

 This species is exceedingly abundant on some bedding planes, the tests vary- 

 ing in length "from .25™" to i™™. They show variation in form, some being 



