on the Navajo Reservation. 



113 



lent of the one given above, except that No. 7 is not repre- 

 sented. 



As shown in the diagram (fig. 8), the conglomerate bed 

 (No. 7) could be traced for less than 300 feet, but material 

 identical in character, in an uneven stratum 2 to 8 feet in 

 thickness (fig. 7), is found about 500 feet farther east beneath the 

 cap of white sandstone (No. 1 of the section), and a bed of the 

 same composition occurs near the top of a detached butte near 



Fig. 7. 



Fig. 7. East end of Garnet Ridge. The man in the figure is standing on 

 the stratum of " glacial" conglomerate. 



at hand. On following the conglomerate bed by excavations, 

 it was found to turn abruptly upward, and after an offset of 20 

 feet to extend to the top of the ridge. To the north of the 

 ridge the bed was again found on the floor of a natural ditch. 

 Further examination led to the conclusion that the stratum of 

 conglomerate in both vertical and horizontal position is of igne- 

 ous origin — a dike and sheet of abnormal composition. 



Microscopic examination of the bed furnished corroborative 

 testimony. 



The stratification of Garnet Ridge is undisturbed except for 

 a distance of about 400 feet, within which the sediments are 

 broken into blocks tilted at various angles and rendered more 



Am. Jour. Sci. — Fourth Series, Vol. XL. No. 236.— August, 1915. 



