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IOWA ACADEMY OF SCIENCE 
Magdalena Group, Gordon. (Journal of Geology, Vol. XV, p. 805, 
1907.) Synonymous with Maderan and Lunasan series, little of either 
of which appear to be represented in the Magdalena range. 
Mangas Quartzite. Basal silicions member of the Mid Cambric sec- 
tion exposed near Silver City. 
3ianzanan Series, Keyes. (Kept. Governor of New Mexico to Secre- 
tary of Interior, for 1903, p. 341, 1904.) Exact synonym of Lunasan 
series, which term is proposed for it. ^ 
Manzano Sandstone, Herrick. (Bull. Hadley Lab. Univ. New Mexico, 
Vol. II, Pt. i, fascicle 3, p. 4, 1900.) Title as originally used appears 
to have been restricted to the lowermost red sandstones to which W. T. 
Lee later gave the designation Abo sandstones. 
Martinian Series; Eansome. (Prof. Pap. U. S. Geol. Surv., No. 21, p. 
33, 1904.) Late Devonie limestone succession of Bisbee, Arizona, Silver 
City, and Lake Valley. 
Maya Conglomerate. Basal member of the Tertiaric section in north- 
eastern New Mexico. 
McElmo Shales, Cross and Spencer. (U. S. Geol. Surv., Folio 60, p. 
4, 1899.) 
Mesa Verde Shales, Holmes. (U. S. Geol. and Geog. Surv. Terr., 
Ninth Ann. Kept., p. 245, 1877.) 
Mimhresan Series, Keyes. (Kept. Governor of New Mexico to Secre- 
tary of Interior, for 1903, p. 341, 1904.) Term restricted to Late 
Ordovicic section in Mimbres, Caballos and Franklin ranges that carries 
the Kichmond fauna. 
Mississippian SeiSies, Winchell. (Proc. American Philos. Soc., Vol. 
XI, p. 79, 1869.) Term again restricted to its original signification and 
to the middle part of the Early Carbonic succession. 
Modoc Limestones, Lindgren. (Prof. Pap. U. S. Geol. Surv., No. 43, 
p. 69; 1905.) Part of the Early Carbonic section extending eastward to 
the Mimbres range from Clifton, Arizona. 
Montanan Series, Eldridge. (Proc. Colorado Sci. Soc., Vol. Ill, p. 
93, 1888.) 
Montosa Limestones, Keyes. (Journal of Geology, Vol. XIV, p. 154, 
1906.) One of the distinctive members of the Lunasan section of the 
Manzana and Sandia ranges. 
Montoy an Series. Mid Ordovicic section of the Franklin, Caballos 
and Mimbres mountains. 
Morrisonian Series, Cross. (U. S. Geol. Surv., Folio 7, p. 2, 1894.) 
Mosca Limestones, Keyes. (Journal of Geology, Vol. XIV, p. 154, 
1906.) Uppermost member, carrying a distinctive fauna, of the Luna- 
san series in the Manzano mountains. 
