Morrow Formation

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Morrow Formation
Stratigraphic range: Pennsylvanian
TypeFormation
AreaNew Mexico, Texas, Oklahoma, Kansas, and Arkansas
Location
CountryUnited States

The Morrow Formation is a geologic formation from the Pennsylvanian geological age that is found in locations ranging from Southeast New Mexico and West Texas to locations in Oklahoma, Southwestern Kansas, and Arkansas.[1][2] It preserves fossils dating back to the Carboniferous period.

New Mexico Morrow Sands[edit]

The morrow formation is found in the Delaware Basin of Southeastern New Mexico.

Map of Delaware Basin. Morrow sand was largely deposited in the NW Shelf of the basin
An example of the flatness found in the region. Image from near the Carlsbad Caverns in Carlsbad, New Mexico.

It can be found at depths of 8,200 to 12,500 feet. In some parts of Southeast Eddy County and West Lea counties, New Mexico, it may be found as deep as 15,000 feet.

Unique characteristics of this formation are:

  • Limited areal extent (limited area to be found on a map)
  • Wide variations of permeability

Source: [3]

The Morrow facies (body of rock with specific characteristics) was deposited in a complex of mixed siliciclastic (mostly silica bearing rock) and carbonate depositional environments.[4]

See also[edit]

References[edit]

  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.


  1. ^ Stratigraphic description of the Morrow Formation using mode-converted shear waves: Interpretation tools and techniques for three land surveys (sterlingseismic.com)
  2. ^ "Geolex — Morrow publications". ngmdb.usgs.gov. Retrieved 2024-05-09.
  3. ^ Henry, J. B. (1974-12-01). "Status of Morrow gas sand exploitation in Eddy County, N. M". Pet. Eng.; (United States). 46:14.
  4. ^ Prediction of reservoir geometries in the Morrow of southeastern New Mexico (Conference) | OSTI.GOV