Age of the Lavas of the Plateau Region. — Reagan. iy 
"3. The Cinder cones and lava flows of the Capulin system, 
which are late Pleistocene and which still maintain their orig- 
inal slope and extent" (Bull, of the University of New Mexico, 
Vol. I, p. 94-95 ; also see Bull. Geol. Soc. of America, Vol. III. 
p. 98). 
STRATIGRAPHICAL SECTIONS. 
Section 1, in Seven Mile Hill canyon, five miles southeast of Fort 
Apache, Arizona. 
Quaternary : 
1. Basalt 200 
2. Volcanic ashes 10 
3. Strata of mostly unlithifiecl sands and clays 40 
4. Shale, light colored, sandy 4 
Tertiary : 
5. Conglomerate rock. The pebbles and cobblestones of this 
series are : quartzite, granite, andesyte, rhyolyte, limestone of 
the Palaeozoic era, etc. (no cobblestone or pebble of the basaltic 
type was 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 par- 
ticles predominate, 200 
Carboniferous : 
7. Red gypsiferous shales, with sandstone and limestone. .. .1100 
1614 
Section 2, East wall of Cherry creek canyon, Arizona, seven miles 
north of Salt river near Mr. Jim Hinton's house. 
Tertiary : feet 
1. Light brown to dark brown rhyolite, capping buttes. This 
rhyolyte is continuous at the base of the buttes with that 
which underlies the tertiary formation here 30 
2. Conglomerate rock, the cement being tufa 80 
Tufa agglomerate 20 
Light gray sandstone 10 
Rhyolyte trap 30 
Gray sandstone and conglomerate 100 
Fine grained, gray to brown sand stone, composed of ground 
up archaean and Palaeozoic rocks, granite, rhyolites, diabases, 
etc 40 
Total 210 
Section 3. South of White River, three miles west of Ft. Apache. 
Quaternary : 
1 . Basalt 200 
2. Unlithified volcanic aches 10 
