252 W, Gross — New Devonian Formation in Colorado. 



nately the fossils obtained by Walcott in the Kanab section are 

 not at present available for comparison with the Colorado 

 forms. As Spencer pointed out in discussing the relations of 

 the Ouray limestone,* " it is very probable that the lower part 

 of the Red Wall limestone [Kanab section] is equivalent in age, 

 as well as in position, to the Devonian limestone of Colorado." 



While certain correlations for both the Elbert and Ouray 

 formations seem definitely indicated by present knowledge, 

 meagre as it is in some directions, there is a marked contrast 

 between the lower Paleozoic section of western Colorado and 

 that of the Front range, especially as exhibited near Canyon 

 City. 



A marked difference also exists between the Kanab section 

 and that of central Nevada, and other localities of the Great 

 Basin. The faunal problem involved is pointed out by Dr. 

 Eastman, and it is clear that the conditions controlling the 

 character of the sedimentary beds form also a most inviting 

 subject for investigation. 



*This Journal (4), vol. ix, 1900, p. 133. 



