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IOWA ACADEMY OP SCIENCE 
Antonio Slates. Thick, somewhat metamorphosed, argillaceous beds 
which lie beneath the Tijeras quartzite, and are well displayed at the 
north end of the Manzano mountains. They are underlain by other but 
as yet undetermined sediments. 
Antonito Limestones. Lowermost of the heavy gray limestones ex- 
posed in fine sections at the southern extremity of the Sandia range. 
Apishipa Shales^ Gilbert. (Seventeenth Ann. Rept., U. S. Geol. Surv., 
Pt. ii, p. 567, 1896.) 
Archuleta Shales. The title is here proposed for that of Animas 
Formation of the San Juan region, which is preoccupied. 
Armendaris Limestones. Main body of the Early Ordovicic lime- 
stones well displayed in the Sierra de los Caballos. 
Arrihan Series, Keyes. (Proc. Iowa Acad. Sci., Vol. XIII, p. 226, 
1908.) Essentially the entire Miocene section as represented around the 
southern end of the Rocky Mountains. 
Aztecan Series. A thick, post-Laramian succession of Cretacic sedi- 
ments in the San Juan region. 
Bella Shales, Keyes. (Trans. American Inst. Mining Eng., Vol. 
XXXIX, p. 147, 1909.) 
Berenda Limestones, Keyes. (Trans. American Inst. Mining Eng., 
Vol. XXXIX, p. 147, 1909.) Late Devonic section of the Mimbres 
region, which possibly represents the attenuated eastward extension of 
the thick Martinian limestones of eastern Arizona. 
Bernalillan Series, Keyes. (Rept. Governor New Mexico to Secretary 
of Interior, for 1903, p. 341, 1904.) Term originally proposed for the 
Mid Carbonic red-beds below the Cimarronian series. 
Bliss Quartzites, Richardson. (Bull. Texas IJniv. Min. Surv. No. 9, 
1904.) Basal member of the Mid Cambric section of the Franklin 
mountains; and the sole representative of the Dragoonan series of that 
area. 
Burro Quartzites. Main body of the Mid Cambric quartzites which 
immediately overlie the Chloridian series of limestones near Silver City. 
Canyon Ijargo Sandstones, Newberry. (Macomb’s Exped. Green 
River, Geol. Rept. p. 1, 1876.) 
Capitan Limestones, Richardson. (Bull. Texas Univ. Min. Surv., No. 
9, 1904.) 
Carrasco Limestones. Main calcareous member of Late Ordovicic 
age well displayed back of the Carrasco' smelter property near Silver 
City. 
Cenocene Series. Latijst formed deposits of the Quaternaric age. 
