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Geologic Unit: Altuda
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Map showing publication footprint
  • Usage in publication:
    • Altuda granite
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Granite
  • AAPG geologic province:
    • Permian basin
Publication:

Udden, J.A., 1907, A sketch of the geology of the Chisos country, Brewster County, Texas: University of Texas Bulletin, no. 93, 101 p.


Summary:

Pg. 70. Altuda granite. An intrusive granite boss lies uncovered over an area of somewhat more than a sq mi 4 miles north of Mount Ord, southwest of Altuda, Brewster County, western Texas. It is a moderately coarse-grained rock of reddish gray color, and weathers into large blocks, sometimes 20 feet in length. It rises in a hill several hundred feet high. The Carboniferous sediments which surround this hill dip away from it and have evidently at one time formed a continuous cover over whole area. [Age unknown; Denver GNU thinks it might be Tertiary.]

Source: US geologic names lexicon (USGS Bull. 896, p. 41); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Altuda granite†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Permian basin
Publication:

King, P.B., 1930, The geology of the Glass Mountains, Texas; Part 1, Descriptive geology: University of Texas Bulletin, no. 3038, 167 p., [Issued 1931]


Summary:

Pg. 100. Largest igneous mass in Altuda Mountain area is at so-called Granite Mountain, or Granite Knob, 1 mile west of the James Ranch and 2 miles south of summit of the mountain. This rock was called "Altuda granite" by Udden. This is not only a misnomer, but implies a formational name for the rock, when no special term appears justified. Actually the rock is a syenite or syenite porphyry. It outcrops on several rugged hills, covered with large exfoliating boulders, and occupies an area of about a square mile.

Source: US geologic names lexicon (USGS Bull. 896, p. 41).


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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