355 



rKORAKI.E EOCENE GLACIAL DEPOSITS IN THE FORT APACHE 

 REGION, ARIZONA.* 



BY 



Alhkkt R. Reagan. 



When the writer wrote his article on tlic Fort Apticlie Region, Arizona, 

 much iniceniented gravel and boulders was found capping the mesas and 

 underlying the lava "flows. These deposits he placed in the Tertiary and 

 Quaternary. In his section on Canyon creek. Arizona, from the source of 

 that stream to its confluence with Salt river, he gives 125 feet of coarse, 

 uncemented gravel, of gneiss and quartzite boulders, capping the clastic 

 rocks. Gilbert's .section at the crossing of Canyon creek also gives 20 feet, 

 coarse uncemented gravel of (piartzitc and gneiss boulders.** Some of the 

 writer's other sections in that region are here copied in whole or in part 

 to show the existence of this material in various parts of the reservations, 

 as follows*** : 



Section in Seven Mile Hill canyon, live miles southeast of Fort Apache, 



Arizona. Feet 



1. Basalt 200 



2. Volcanic ashes 10 



3. Strata of mostly unlithitied sand and clays 40 



4. Shale, light colored, sandy 4 



5. Conglomerate rock, the cement being volcanic ash. The pebbles 



and cobble stones of this series being quartzite, granite, an- 

 desyte, rhyplyte, limestone of the Palaeozoic era, etc., (no 

 cobblestones or pebbles of the basaltic type were found in this 

 conglomerate ) 60 



6. Strata of partly lithified coarse grained, reddish to light brown 



sandstone, composed of angular and rounded grains of granite, 

 rhyolyte, etc. In this series the rhyolyte-trachyte particles 

 predominate 200 



7. Red gypsiferous shales with sandst<me and limestone of the 



Carboniferous age GOO to 1100 



1614 



Section along East wall of Cherry Creek Canyon, Arizona, seven miles north 

 of Salt River, near Mr. James Hinton's house. Feet 



1. Light to dark brown rhyolyte 30 



2. Conglomerate rock 80 



3. Tufa conglomerate and agglomerate 20 



*For references on this region the reader is referred to the following : Gilbert, 

 C. K.. and Marvin, A. R., U. S. (ieogr. Sur. west of the 100th Meredian, Vol. iii, 

 and special references as follows: Gilbert, pp. l«:i, lfi-1, 10.1, .-.12G-52S ; Marvine, pp. 

 •_'21 I'l'H. 



Loew, Oscar, ibid., pp. 587, 642. 



Reagan, Albert K., Geology of the Fort Apache Region in Arizona, Am. Geologist, 

 Xc.v.. I'.tn:;. pp. 265-30S. 2 maps, 1 plate. 



♦♦(iilbcrt. ihi<l. p. 104 : Reagan, loc. clt., p. 270. 



***Rengan, ibid. pp. 270-27.5. 



