GEOLOGIC CORRELATION 
261 
Chaco Clays, Keyes. (Proe. Iowa Acad. Sci., Vol. XIII, p. 225, 
1908.) Main body of clays, shales and sands heretofore referred to 
the Wasatch sequence of the San Juan basin. 
Chacra Sandstones, Massive sandstone layers forming the upper 
member of the Mesa Yerde coal formation and constituting a prominent 
relief feature in the southeastern part of the San Juan region. 
Chaquaqua Shales. Section of alternating red sandstones and shales, 
finely exposed in the Chaquaqua canyon, in northeast New Mexico. , 
Chaman Series, Keyes. (Proc. Iowa Acad. Sci., Yol. XIII, p. 224, 
1908.) Main body of so-called Wasatch section, in the San Juan dis- 
trict. 
Chaves Shales. Lowermost section of red shales which rest on the 
great Capitan limestones* in the Guadaloupe mountains. 
Chiricahuan Series. Late Cambric limestone succession well de- 
veloped in the Chiricahua and Caballos ranges. 
Chloridian Series. Mid Cambric limestone succession extensively^x- 
posed in Grant county; and probably the eastern attenuation of the 
Abrigo sequence of limestones of Bisbee. 
Cibola Limestones. Important Mid Siluric limestone member out- 
cropping at the Cibola mill at Silver City. 
Cimarronian Series, Cragin. (Colorado College Studies, Yol. YI, p. 
18, 1896.) 
Coloradan Series, Endlich. (IT. S. Geol. and Geog. Surv. Terr., 
Ninth Ann. Kept., p. 126, 1877.) 
Comanchan Series, Hill. (Am. Jour. Sci. (3), Yol. XXXIII, p. 298, 
1887.)^ 
Coyote Sandstones, Herrick. (Bull. Hadley Lab. Univ. New Mexico, 
Yol. II, fascicle 3, p. 4, 1900.) 
Cristobal Limestones. Main body of Late Ordovicic limestone sec- 
tion in the Franklin, Caballos, Fra Cristobal and*Mimbres ranges. 
Dakotan Series, Meek and Hayden. (Proc. Acad. Nat. Sci. Phila- 
delphia, Yol. XIII, p. 410, 1862.) 
Dragoonan Series, Dumble. (Trans. American Inst. Mining Eng., 
Yol. XXXI, p. 1902.) Mid Cambric section finely exposed in the 
vicinity of Silver City. Originally defined in the Dragoon range of 
southeastern Arizona. 
Dockuman Series, Hill. (Texas Geol. Sury., First Ann. Kept., p. 
189, 1890.) 
Doloresan Series, Cross. (U. S. Geol. Surv., Folio 57, p. 2, 1899.) 
