THE OLDER MESOZOTC OF ARIZONA. 



^ Limestone Canyon 

 %^Linh Colorado Valley 



m 

 f'Pi '^ 



about 7 miles, aiul followinjz; it at that level foi- about (1 miles more, to 



where there is a decided beml in the stream which comes in fi'om the east. 



The Moeiieopie h(>r(> runs between high bluff's, and 



the section shows those of the I'ifjht bank, passing 



through Tuba, which is 300 feet above the bed of 



the Moencopie, and continuing on over the l)i'own 



and white I'ocks. The maximum thickness is ;^,0()() 



feet and the length of the section 24 miles. The 



following is the section: 



Description oj the strttdn shoint in fig. 2. 



Fpet. 



1. ('arliciiiifiM'uus liincstone 1(K) 



2. Moencopie fonnation (>()() 



3. Litliodeiidron member •'>'*l 



4. Variegated marls 4IKI 



.5. Limestones and mortar beds 2()() 



(). Variegated sandstones .500 



7. Brown sandstones 600 



<S. Wliite sandstones 100 



^1 



Total thiekness .3, OW) 



The brown sandstones, No. 7, are here alnior- 

 mally thickened at the expense of the variegated 

 sandstones, Xo. (i. This may be due to the south- 

 ward extension of the Echo Cliffs displacement, and 

 a dike less than 2 feet thick and nearly vertical 

 was seen on the south side of the valley running 

 through the entire bluff and trending southwest 

 almost exactly in line with Echo Cliffs. 



SECTION III. 



-THE WWEH LITTLE COLORAIH) VALLEY. 

 [PI. IV, E-F.] 



This section aims to give the entire series from 

 its contact with the Paleozoic near Black Tank, at 

 the foot of San Francisco Mountain, to the highest 

 t)eds reached on the mesas that rise to the south of 

 the Moencopie Wash. It passes through the bed 

 of the Little Colorado a few miles above Tanners 

 Crossing and the important marl butte region to the 

 east of the ri\'er, in which most of oiu- work was done, and passes over the 

 high escarpment 10 miles fait liei- east, terminating in the white sandstones. 



Painted Desert 



Tuba 



Ll^ 



