TRIASSIC PORTION OF SHINARUMP GROUP 119 



Carried forward ......... 81 



6. Limestone conglomerate, grading into sandstone . . . . ij 



5. Sandstone, gray, massive, becoming shaly near top .... 23 



4. Calcareous sandstone with fine-grained conglomerate near base and 



top ; pebbles of limestone and sandstone with occasional bone fragments ; 



pebbles vary from size of a pea to several inches diameter . . 9 



3. Red sandy shale alternating with sandstone ..... 8 



2. Conglomerate containing pebbles of limestone and sandstone . . i 

 I. Sandstone and shale alternating, red and green, the shales sandy and 



friable. ........... 35 



158^ 



Beneath No. i of this section is a blue limestone carrying coral 

 (Zaphrentis), and, in all, 380 feet of Pennsylvanian beds are exposed, 

 consisting of alternating sandstones and limestones, with abundant 

 fossils. No unconformity was noticeable between the coralline 

 limestone and the overlying sandstone and it is not certaia whether 

 Nos. I, 2, and 3 of the above section should be included with the 

 Carboniferous or not. 



The point to be emphasized is that for somewhat more than 

 one hundred feet below the Vermilion Cliff in this section the beds 

 present the characteristics of the lower part of the Dolores formation 

 of Colorado rather than of anything hitherto described from the 

 Shinarump. There is at most only about forty-five feet of beds refer- 

 able to any formation between the Pennsylvanian and Dolores. 



In Grand River Canyon, twelve miles above Moab, the bone- 

 bearing limestone-conglomerate series is found in marked angular 

 unconformity with the underlying beds and it is probable that two 

 thousand feet of strata consisting of two groups of sandstones, con- 

 glomerates, and shales, separated by a gypsiferous-shale series, are 

 present between the Pennsylvanian and Dolores strata. No fossils 

 were found in these intermediate beds, but they seem to correspond 

 to the strata of possible Permian age known in Colorado between the 

 Dolores and Hermosa (Pennsylvanian) formations, and collectively 

 termed the Cutler formation in the San Juan folios (3). 



We found no specifically determinable bones in the beds below the 

 Vermilion Cliff on Grand River. The best obtained was a crushed 

 vertebra belonging, according to Mr. Gidley, to a Triassic form of 

 carnivorous Dinosaur, or possibly to a belodont crocodile. The 



