J56 GEOGEAPHIC DISTEIBUTION. 



country the difference of dip is not easily distinguished, but the evidences 

 of erosion are usually apparent. 



No evidence of unconformity between the Cretaceous formations has 

 been discovered, and the planes of demarkation in many places are not well 

 exhibited. In such a case the lines are drawn on the map only as approxi- 

 mations. Nor is there any evidence of unconformity between the lowest 

 Cretaceous and the highest Jura. Here, also, the stratigraphic plane is 

 sometimes obscure. The teleost shales contain the lowest Cretaceous fossils 

 which have yet been found, and the bad-land beds below the conglomerates 

 contain the highest Jurassic fossils found. The intervening conglomerates 

 I have thought best to call Cretaceous. 



In a general way the horizon of conglomerates can be easily traced ; 

 still, it is a variable one. Here the sandstones are found with conglom- 

 erates of small pebbles which cannot be easily separated from the sand- 

 stones as they merge into them by imperceptible gradations. Elsewhere 

 well developed conglomerates are found, and sometimes heavy beds of 

 coarse conglomerate prevail. 



* * * * * * * 



The following section of the Cretaceous Groups was made on the east 

 side of the Green River above Flaming Gorge. 



POINT OF ROCKS GROUP. 



Upper Hogback Sandstone. No. 1, 60 feet. Sandstones; indurated; 

 light gray ; stained in patches with iron. 



No. 2, 60 feet. Sandstones ; gray ; on exposed surfaces stained brown 

 with iron ; containing fragments of coal. 



No. 3, 25 feet. Sandstones ; very massive ; light gray. 



No. 4, 5 feet. Carbonaceous shales, with seams of coal. 



No. 5, 35 feet. Sandstones ; indurated ; gray. 



No. 6,18 feet, Carbonaceous shales, with seams of coal. 



No. 7, 80 feet. Sandstones ; indurated ; dark gray. 



No. 8, 60 feet. Sandstones ; massive ; light gray. 



No. 9, 4 feet. Carbonaceous shales, with seams of coal. 



