486 CROSS AND HOWE — RED BEDS OF SOUTHWESTERN COLORADO 



The basal conglomerate of this section is called the Shinarump con- 

 glomerate by Walcott (39) and is said to rest unconformably on the 

 Permian beds. 



Comment on WalcoWs Kanab section. — In this Kanab section it is evi- 

 dent that numbers 1 to 12, inclusive, aggregating 960 feet in thickness, 

 represent the upper Jurassic group called the Flaming Gorge by Powell. 

 Number 13 is the White Cliff sandstone, considered as the lower Jurassic 

 in this discussion, but placed by Powell in the Trias. Mr Walcott com- 

 ments in his notes upon the absence of a sharp line between this sand- 

 stone and that below it. Reasons why an apparent transition at this 

 horizon is natural have been presented. This thickness of the vermilion- 

 colored sandstone, 14 of the section, was found to vary from 600 to 700 feet 

 on opposite sides of the valley where the section was made, a variation 

 which may possibly be due to erosion. 



It is noteworthy that the White Cliff sandstone is thinner in Kanab 

 valley than it is to the east, where Dutton and Powell refer to it as a thou- 

 sand feet thick. Beneath the White Cliff sandstone occur 2,845 feet of 

 beds, which are referable to the Trias. It is not certain just what repre- 

 sents the Vermilion Cliff sandstone of Dutton, said by him to be 2,000 

 feet thick near the Virgen river and 1,400 or 1,500 feet thick in the zone 

 crossed by the Kanab (9, page 40). It would appear, however, that beds 

 14 to 20, inclusive, in all 1,600 feet of sandstones, represent the Vermilion 

 Cliff of Dutton, although the distinctive color is not present throughout. 

 Assigning the beds specified to the Vermilion Cliff, the remainder of the 

 section, embracing 1,245 feet of beds, must be referred to the Shinarump 

 group of Powell. 



The Shinarump of Kanab valley, thus delimited, carries fossil wood in 

 the basal conglomerate and at various horizons in the upper portion. 

 Far more interesting than the silicified wood, which has not been studied 

 by paleobotanists, are the fish and other animal remains obtained by 

 Walcott in beds 23 and 25 of the section — that is, in the upper third of 

 the Shinarump. 



These fossils were sent to the National Museum, and in the confusion 

 of inadequate storage facilities were lost sight of until a few months ago. 

 On being found they were sent to Dr C. R. Eastman for identification and 

 description. Doctor Eastman's complete identifications are not yet 

 available, but he has published a brief preliminary reference to the 

 ichthyic fauna, from which the following is abstracted : 



"These remains . . . are extremely fragmentary and do not permit of accu- 

 rate specific determination. Of the few genera, which are tolerably well indicated, 

 such as Pholidophorus and several Lepidotus-\\ke forms, it can not 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 



