38 



MESOZOIC FLORAS OF rNirFI) STATES. 



Limestone Canyon 

 Coconino Point 



and lower in its horizon, until at last, some 12 miles below, the Paleozoic 

 limestones appear, and in the very narrow canyon suddenly formed at the 

 Ijase of Coconino Point, which forms the eastern 



_ ro N W 



escarpment of theColorado Plateau, the limestone 

 rocks rise to a height of lOU feet and constitute 

 the canyon proper. The section along the river 

 between these points was carefully worked out 1 )y 

 me. The most remarkable fact was that about 

 4 miles above the limestone canyon there occurs 

 a Paleozoic anticline as viewed from the bluffs, 

 the limestones rising to a height of about 90 feet 

 and again descending to the bed of the river, the 

 length of the anticline being about 2 miles. This : 

 of course represents a spur of the Colorado Pla- • 

 teau, nmning out parallel to it in a northeasterly \ 

 direction, which was cut through by the river. = 

 This is shown in the following diagrammatic sec- : 



tion, 12 miles in length: \ 



< 



Description oj the section shown in fig. 1. i 



Feet. = 



1. Carboniferous limestone 100 t 



2. Argillaceous shales and sandstones, Mocncopie formation . 200 j 



.3. Lithodendron member 125 J 



i. Trap 30 < 



I 



Total tbiokness 45.5 - 



The above are the vertical measurements of f *''^ ^°'""^'" ^'''' 

 the beds as seen in the bluffs. Probably twice 

 that thickness of the Moencopie beds is repre- 

 sented, and only the base of the conglomerate 

 series is here exposed. 



SECTION II.~MOENCOPIE WASH. 



[PI. IV, C-D.] 



This section begins some 5 or 6 miles below 

 the mouth of the Moencopie Wash, opposite the 

 upper end of the limestone canyon. The rocks 

 dip away from the river from the first, and the section remains wholly 

 within the valley of the Moencopie, reaching the bed of it at a distance of 



lannars Crossing 



