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Geologic Unit: Aleman
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Map showing publication footprint
  • Usage in publication:
    • Aleman formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Dolomite
    • Chert
  • AAPG geologic province:
    • Orogrande basin
Publication:

Kelley, V.C., and Silver, Caswell, 1952, Geology of the Caballo Mountains; with special reference to regional stratigraphy and structure and to mineral resources, including oil and gas: University of New Mexico Publications in Geology, no. 4, 286 p.


Summary:

Pg. 57, 60-62, figs. 2, 3; F.E. Kottlowski and others, 1956, New Mexico Bur. Mines Mineral Res. Mem., no. 1, p. 25-26. Aleman formation of Montoya group. Consists of alternating beds of chert and dolomite. Chert occurs as irregular bands 1 to 3 inches thick alternating with 1- to 6-inch bands of dolomite. Chert weathers white, brown, and black, and the dolomite light gray to medium-gray. Thickness varies; about 200 feet in Organ Mountains. Thins to an edge northward owing to pre-Percha, pre-Lake Valley, and pre-Magdalena erosion. Underlies Cutter formation (new); overlies Upham dolomite (new). Fossiliferous; brachiopods ZYGOSPIRA RECURVIROSTRIS, RAFINESQUINA sp., RHYNCHOTREMA sp., STROPHOMENA sp. Age is Late Ordovician (Cincinnatian).
Type locality (Cable Canyon section): on north side of canyon [Flordillo Canyon] opposite Sierrite Mine, in T. 16 S., R. 4 W., [approx. Lat. 32 deg. 55 min. 36 sec. N., Long. 107 deg. 13 min. 42 sec. W., Apache Gap 7.5-min quadrangle], Caballo Mountains, Sierra Co., southwestern NM. Named from Aleman station along Santa Fe RR to east of the mountains in the Jornada del Muerto. [Additional locality information from USGS historical topographic map collection TopoView, accessed Veterans Day, 2015; see also Seager and Mack, 2004, 2005.]

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 48).


Map showing publication footprint
  • Usage in publication:
    • Aleman Member
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Pedregosa basin
Publication:

Zeller, R.A., Jr., 1965, Stratigraphy of the Big Hatchet Mountains area, New Mexico: New Mexico Bureau of Mines and Mineral Resources Memoir, no. 16, 128 p.


Summary:

Aleman Member of Montoya Dolomite. Overlies Upham Member and underlies Cutter Member, both of Montoya. Age is Late Ordovician (Cincinnatian).
Measured section: in Mescal Canyon, in NE/4 SE/4 sec. 29, T. 30 S., R. 15 W., Hidalgo Co., NM; 76 feet thick.

Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Aleman Cherty Member*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Orogrande basin
Publication:

Keroher, G.C., 1966, [Selected U.S. Geologic Names Committee remarks], IN Keroher, G.C., 1966, Lexicon of geologic names of the United States for 1936-1960: U.S. Geological Survey Bulletin, 1200, pts. 1-3, 4341 p., (3 volumes)


Summary:

Pg. 48. Aleman Cherty Member of Montoya Dolomite. The USGS currently [ca. 1966] classifies the Aleman as a member of Montoya Dolomite on basis of study now in progress. Recognized in southwestern New Mexico. Age is Late Ordovician.

Source: US geologic names lexicon (USGS Bull. 1200, p. 48).


Map showing publication footprint
  • Usage in publication:
    • Aleman Dolomite*
  • Modifications:
    • Mapped 1:24k
    • Redescribed
  • Dominant lithology:
    • Dolomite
    • Chert
  • AAPG geologic province:
    • Pedregosa basin
Publication:

Drewes, Harald, 1991, Geologic map of the Big Hatchet Mountains, Hidalgo County, New Mexico: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2144, 1 sheet, scale 1:24,000


Summary:

Aleman Dolomite of Montoya Group. Mapped in Big Hatchet Mountains, Hidalgo County, New Mexico. Light- to dark-gray, thin-bedded, highly cherty dolomite. Thickness about 76 feet (23 m). Underlies Cutter Dolomite and overlies Middle Ordovician Upham Dolomite, both of Montoya Group. Age is Late Ordovician.

Source: Publication.


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For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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