STRATIGRAPHICAL GEOLOGY 
335 
STRATIGRAPHICAL GEOLOGY 
Delimitations of Sundry Arizona Terranes. A number of un¬ 
familiar formational terms are included in the recently issued table 
of geological mapping units.^ Some of these designations are al¬ 
ready long in use in States adjoining Arizona. Others now 
appear for the first time as terranal titles; but the accompanying 
definitions, assigned geographical locations, and stratigraphic posi¬ 
tions, enable each to be readily identified in the field. A complete 
list of titles which have been applied to Arizona’s geological for¬ 
mations, together with their definitions and full synonomy are re¬ 
served for another connection. 
Adanana Shales. Title is proposed for Ward’s fourth shale bed 
above the Aubreyan limestones in the Moenkopian section of the 
Navajo country, and exposed in full measurement near the rail¬ 
road station of Adanana, in Apache County. 
Archuleta Shales^ Keyes. (Proc. Iowa Acad. Sci., Vol. XIII, p. 
224, 1908.) Name is suggested for Shaler’s Animas Formation, 
which title is preoccupied. 
Armedaris Limestones, Keyes. (Proc. Iowa Acad. Sci., Vol. 
XXII, p. 260, 1916.) 
Aubreyan Series, Gilbert. (U. S. Geol. and Geog. Surv. W. 
100 Merid., Vol. Ill, p. 177, 1875.) 
Aztecan Series, Keyes. (Proc. Iowa Acad. Sci., Vol. XIII, p. 
226, 1908.) 
Bella Shales, Keyes. (Trans. American Inst. Mining Eng., Vol. 
XXXIX, p. 147, 1909.) 
Canyon Largo Sandstones, Newberry. (MaComb’s Exped. 
Green River, Geol. Rept., p. 1, 1876.) 
Chacra Sandstones, Keyes. (Proc. Iowa Acad. Sci., Vol. XIII, 
p. 224, 1908.) 
1 This Journal, Vol. XXXVIII, pp. 250-251, 1922. 
