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Map showing publication footprint
  • Usage in publication:
    • Marlow Mountain rhyolite
  • Modifications:
    • First used
  • Dominant lithology:
    • [Rhyolite]
  • AAPG geologic province:
    • Midcontinent region
Publication:

Hayes, W.C. (chairman), 1961, Guidebook to the geology of the St. Francois Mountain area: Missouri Division of Geological Survey and Water Resources Report of Investigations, no. 26, 137 p.


Summary:

Marlow Mountain rhyolite (new) of Middlebrook group (new). Briefly summarized in report by W.C. Hayes, Precambrian rock units in Missouri, p. 83 (table 1), this volume. New names are credited to Tolman and Robertson (in prep.) [1969, Missouri Div. Geol. Survey Water Res. Rpt. Inv., no. 44 (Contrib. to Precambrian Geol., no. 1)]. Age is Precambrian.
Occurs in St. Francois Mountain area. Marlow Mountain is in T. 32 N., R. 5 E., Madison Co., southeastern MO.

Source: Modified from US geologic names lexicon (USGS Bull. 1350, p. 470).


Map showing publication footprint
  • Usage in publication:
    • Marlow Mountain rhyolite
  • Modifications:
    • Principal reference
  • Dominant lithology:
    • Rhyolite
  • AAPG geologic province:
    • Midcontinent region
Publication:

Tolman, C.F., and Robertson, F., 1969, Exposed Precambrian rocks in southeast Missouri: Missouri Division of Geological Survey and Water Resources Report of Investigations, no. 44, 68 p., (incl. geologic map), Also issued as Contrib. Precambrian Geol., no. 1


Summary:

Marlow Mountain rhyolite of Middlebrook group. Notable exposures on Marlow Mountain (type), Black Mountain, and Jace Mountain, Madison County, St. Francois Mountains, southeastern Missouri. In lower part of unit, groundmass is microgranitic and phenocrysts are best developed. In upper part of unit, where flow structures are obvious, groundmass is finer grained and feldspar phenocrysts have corroded edges. Flow breccia is present at upper surface. Thickness 550 feet on Marlow and Black Mountains. Underlies Stouts Creek rhyolite of Van East group; base of unit not known. Age is Precambrian.
Type locality stated to be on west side of Marlow Mountain, in secs. 10 and 11, T. 32 N., R. 5 E., Madison Co., southeastern MO. Named from exposures on west side of Marlow Mountain.
[GNU remark (Feb. 21, 1990, USGS DDS-6; Denver GNULEX): Author states that unit has a type locality, though one is not designated. Stratigraphic relationships of units of Middlebrook not discussed in text; geologic map (plate 1) missing from library copy of report.]

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


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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