GEOLOGIC CORRELATION 
265 
N acimientan S cries ^ Keyes. (Proc. Iowa Acad. Sci., Vol. XIII, p.. 
224, 1908.) Includes the main body of Puerco marls of E. D. Cope, and 
other argillaceous beds. 
Naiad Limestone. Main ore-bearing formation at Georgetown, Silver 
City and elsewhere in these districts. 
Navajo Shales. Thick, upper member of the Laramian series in the 
San Juan region. 
Ninos Schists. Lower and principal schistose section above the Azoic 
gneisses in Solitario mountain, northwest of Las Vegas. 
Palomas Series^ Gordon. (Prof. Pap. U. S. Geol. Surv., No. 68, p. 
237, 1910.) Term restricted to the Mid Quaternaric, or Pleistocene, 
section. 
Pecosan Series, Keyes. (Proc. Iowa Acad. Sci., Vol. XIII, p. 227, 
1908.) Includes essentially all of the Pliocene section of the Llano 
Estacado region. 
Penasco Quartzite. Main body of silicious section exposed near 
Pecuris, north of Santa Fe. 
Perchan Series, Gordon. (Am. Jour. Sci. (4), Vol. XXIV, p. 58, 
1907.) 
Pictured Cliffs Sandstones, Holmes. (U. S. Geol. and Geog. Surv. 
Terr., Ninth Ann. Kept., p. 246, 1877.) 
Pic'iirisan Series. A thick section of highly tilted sediments of 
Archeozoic age widely exposed on the west side of the Rocky mountains 
north of Santa Fe. They strike northwest and southeast, and are best 
exposed near the village of Pecuris. 
Pino Vititos Sandstones. Basal member of the Montanan coal-bearing 
series around the southern end of the Rocky mountains. 
Pleistocene Series. Term here restricted to the Mid Quaternaric sec- 
tion. 
Puerco Clays, Cope. (Kept. Secretary of War to Forty-fourth Cong., 
Vol. II, Pt. ii, p. 1012, 1875.) 
Quartermaster Shales. Gould. (Water Supply and Irrig. Pap., JJ. 
S. Geol. Surv., No. 148, p. 39, 1905.) 
Bociado Limestones. Main body of Archeozoic limestones in the 
Solitario Mountain district, northwest of Las Vegas. 
Ratonan Series, Knowlton. (Am. Jour. Sci., (4), Vol. XXXV, p. 
527, 1913.) 
San Andreas Limestones, Lee. (Bull. IT. S. Geol. Surv., No. 389, p. 9, 
1907.) Upper part of Maderan series. 
Sandia Shales, Herrick. (Journal of Geology, Vol. VIII, p. 115, 
1900.) 
