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Geologic Unit: Dockum
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Map showing publication footprint
  • Usage in publication:
    • Dockum beds
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
    • Conglomerate
    • Clay
  • AAPG geologic province:
    • Permian basin
Publication:

Cummins, W.F., 1890, The Permian of Texas and its overlying beds, IN Dumble, E.T., First annual report of the Geological Survey of Texas, 1889: Geological Survey of Texas Annual Report, v. 1, p. 185-200. [Available online from the University of Texas-Austin library: http://www.lib.utexas.edu/books/dumble/]


Summary:

Pg. 189. Dockum beds. Water-bearing conglomerate, sandstone, and red clay, 150 feet thick, unconformably overlying clays and sandstones of Upper Permian, and entirely unlike anything heretofore seen in Texas. Unconformably underlies Blanco Canyon beds [Blanco formation]. Fossils. [Age is Late(?) Triassic.]
Named from Dockum, Dickens Co., western TX.

Source: US geologic names lexicon (USGS Bull. 896, p. 616); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Dockum group*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Anadarko basin
    • Palo Duro basin
Publication:

Gould, C.N., 1907, Geology and water resources of the western portion of the Panhandle of Texas: U.S. Geological Survey Water-Supply Paper, 191, 70 p.


Summary:

Pg. 20-29. Dockum group. Along eastern edge of Llano Estacado, in Potter and Randall Counties of the Texas Panhandle, includes (ascending) Tecovas and Trujillo formations. Thickness up to 400+ feet. Unconformably overlies Permian Quartermaster formation, and in places, unconformably underlies Tertiary sand and clay. Vertebrate fossils. Age is Triassic.

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


Map showing publication footprint
  • Usage in publication:
    • Dockum group
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Sierra Grande uplift
Publication:

Parker, B.H., 1933, Clastic plugs and dikes of the Cimarron Valley area of Union County, New Mexico: Journal of Geology, v. 41, no. 1, p. 38-51.


Summary:

Dockum group. Name applied to the 400+ feet-thick maroon to purple conglomerate, sandstone, and shale sequence in Cimarron Valley, Union County, New Mexico. Underlies the shales and marls of the Sloan Canyon formation (new) or unconformably underlies the cross-bedded sandstones of the Exeter. Age is Triassic(?).

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


Map showing publication footprint
  • Usage in publication:
    • Dockum group*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Permian basin
Publication:

Wilmarth, M.G., 1936, [Selected Geologic Names Committee remarks (ca. 1936) on Jurassic and Triassic rocks of West Texas and New Mexico], IN Wilmarth, M.G., 1938, Lexicon of geologic names of the United States (including Alaska): U.S. Geological Survey Bulletin, 896, pts. 1-2, 2396 p.


Summary:

Dockum group. Recognized in panhandle of Texas and southeastern New Mexico. In Texas is divided into Trujillo formation (above) and Tecovas shale (below). Unconformably overlies Permian (Double Mountain and Quatermaster formations) and unconformably underlies Blanco formation (Pliocene). Age is Late(?) Triassic.

Source: US geologic names lexicon (USGS Bull. 896, p. 616).


Map showing publication footprint
  • Usage in publication:
    • Dockum Group
  • Modifications:
    • Areal extent
    • Biostratigraphic dating
  • AAPG geologic province:
    • Sierra Grande uplift
    • Palo Duro basin
Publication:

Stovall, J.W., and Savage, D.E., 1939, A Phytosaur in Union County, New Mexico with notes on the stratigraphy: Journal of Geology, v. 47, no. 7, p. 759-766.


Summary:

Pg. 759-766. Skull of phytosaur MACHAEROPROSOPUS discovered in Sloan Canyon formation, confirms Triassic age of rocks lying beneath Exeter (Jurassic) in valley of dry Cimarron River in Union County, New Mexico, and Cimarron County, Oklahoma. Underlying red beds, the Sloan Canyon formation, and Sheep Pen Canyon formation form continuous and conformable succession of strata. These three units should be included in Dockum group.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1127-1128).


Map showing publication footprint
  • Usage in publication:
    • Dockum group*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Permian basin
Publication:

King, R.E., Bates, R.L., Hills, J.M., Martin, B.G., and Taylor, S.J., 1942, Resume of geology of the south Permian basin, Texas and New Mexico: Geological Society of America Bulletin, v. 53, no. 4, p. 539-560.


Summary:

Pg. 556. Dockum group. Upper Triassic red shales and sandstones of terrestrial origin overlie Permian throughout much of southern Permian basin. They are placed in Dockum group and divided into (ascending) Tecovas shale, Santa Rosa sandstone, and Chinle shale.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1127-1128).


Map showing publication footprint
  • Usage in publication:
    • Dockum group
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Permian basin
Publication:

Hendrickson, G.E., and Jones, R.S., 1952, Geology and ground-water resources of Eddy County, New Mexico: New Mexico Bureau of Mines and Mineral Resources Ground-water Report, no. 3, 169 p., (incl. geologic map, scale 1:63,360), Reprinted 1985


Summary:

Pg. 23-24. Dockum group. In Eddy County, New Mexico, overlies Rustler formation. Consists of redbeds and sandstones. Lower part of these beds has been considered Permian and correlated with Dewey Lake redbeds by some geologists. Total thickness of group east of Artesia is about 1,000 feet. Formations exposed are Pierce Canyon redbeds, Santa Rosa sandstone, and redbeds that possibly represent the Chinle formation. Age is Triassic.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1127-1128).


Map showing publication footprint
  • Usage in publication:
    • Dockum group
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • San Juan basin
    • Estancia basin
Publication:

Stearns, C.E., 1953, Tertiary geology of the Galisteo-Tongue area, New Mexico: Geological Society of America Bulletin, v. 64, no. 4, p. 459-508., April 1953


Summary:

Pg. 463 (fig. 2), 467. Glorieta sandstone, in Galisteo-Tongue area, New Mexico, is overlain by about 800 feet of red and variegated sandstone and shale. These beds are generally correlated with Dockum group of eastern New Mexico.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1127-1128).


Map showing publication footprint
  • Usage in publication:
    • Dockum group*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Anadarko basin
Publication:

McLaughlin, T.G., 1954, Geology and ground-water resources of Baca County, Colorado: U.S. Geological Survey Water-Supply Paper, 1256, 232 p., (incl. geologic map, scale 1:108,600)


Summary:

Pg. 82-87, geol. map. Dockum group [undivided]. As used in this report (Baca County, southeasternmost Colorado), includes all Triassic-age rocks between Cragin's Permian Taloga formation and Upper Jurassic Entrada sandstone. Maximum observed thickness 50 feet. In southwestern part of county, Carrizo Creek area, beds are highly fractured, variegated shale, clay, and siltstone with lesser amounts of sandstone and conglomerate. In southeastern part of county, along Cimarron River, beds are predominantly red and considerably more sandy; most are well-sorted, friable, and loosely cemented with calcium carbonate or limonite. In northwestern part of county, along Two Butte Creek, beds are mostly dense, red to maroon siltstone and sandstone, and gray limestone. Report includes geologic map.

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Dockum formation*
  • Modifications:
    • Mapped 1:500k
  • AAPG geologic province:
    • Palo Duro basin
    • Anadarko basin
Publication:

Miser, H.D., Oakes, M.C., Ham, W.E., Huffman, G.G., Branson, C.C., Chase, G.W., McKinley, M.E., Warren, J.H., Harris, R.L., Ford, D.H., and Fishburn, D.J., 1954, Geologic map of Oklahoma: U.S. Geological Survey [State Geologic Map], scale 1:500,000, Prepared in cooperation with Oklahoma Geol. Survey


Summary:

In Cimarron County, Oklahoma, Triassic Dockum formation is mapped undifferentiated with Jurassic Morrison and Exeter formations.
[Isolated exposures of Dockum around Guymon, Texas County, and along Texas-Beaver County line, Oklahoma.]

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 1127-1128).


Map showing publication footprint
  • Usage in publication:
    • Dockum group
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Sierra Grande uplift
Publication:

Baldwin, Brewster, and Muehlberger, W.R., 1959, Geologic studies of Union County, New Mexico: New Mexico Bureau of Mines and Mineral Resources Bulletin, no. 63, pt. 2, 171 p.


Summary:

Pg. 34-42, pl. 1d. Dockum group. As used in this report, includes all beds of Triassic age exposed in Union County, northeastern New Mexico. With only one or two exceptions, exposures of the Dockum are restricted to drainage area of Dry Cimarron, where group is divided into four formations (ascending): Baldy Hill (new), Travesser (new), Sloan Canyon, and Sheep Pen. Thickness about 900 feet. Unconformably underlies Exeter sandstone. Thought to correlate with Wingate sandstone and upper part of Chinle formation of Arizona. Fossils. Age is Late Triassic.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1127-1128); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Dockum group*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Anadarko basin
Publication:

Jewett, J.M., 1959, Graphic column and classification of rocks in Kansas: Kansas Geological Survey


Summary:

Dockum group shown on chart with statement that some part of Triassic section is believed to crop out in small in Morton County, Kansas.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1127-1128).


Map showing publication footprint
  • Usage in publication:
    • Dockum Group, undivided
  • Modifications:
    • Mapped 1:250k
  • Dominant lithology:
    • Shale
    • Sandstone
    • Siltstone
    • Limestone
    • Gravel
  • AAPG geologic province:
    • Permian basin
Publication:

Barnes, V.E. (project director), 1976, Geologic atlas of Texas, Hobbs sheet: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, scale 1:250,000, William Battle Phillips memorial edition


Summary:

Pamphlet [p. 4]. Dockum Group, undivided. Shale, sandstone, siltstone, limestone, and gravel; mostly shale, micaceous, thin-bedded, variegated. Thickness up to 300 feet. Age is Triassic.
[Small isolated exposures mapped in Eddy and Lea Cos., NM, and in Andrews, Martin, and Midland Cos., TX.]

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Dockum Group
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Sierra Grande uplift
    • Palo Duro basin
    • Amarillo arch
Publication:

Barnes, V.E. (project director), 1983, Geologic atlas of Texas, Tucumcari sheet: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, scale 1:250,000, Henryk Bronislaw Stenzel memorial edition


Summary:

Is Upper Triassic group with 3 formations separately mapped in this sheet in northeast NM and TX Panhandle (Sierra Grande uplift, Palo Duro basin, and Amarillo arch). Mapped formations are (descending): Chinle Formation--shale, siltstone, sandstone, limestone, and mudstone; Trujillo Formation--conglomerate, sandstone, and shale; and Tecovas Formation--shale, clay, siltstone, and sand. Overlies Quartermaster Formation (Permian); overlain by Exeter Sandstone (Upper Jurassic).

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


Map showing publication footprint
  • Usage in publication:
    • Dockum Formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Permian basin
Publication:

Chatterjee, Sankar, 1986, The Late Triassic Dockum vertebrates; their stratigraphic and paleobiogeographic significance, Chapter 10, IN Padian, Kevin, ed., The beginning of the age of dinosaurs; faunal change across the Triassic-Jurassic boundary: Cambridge, UK, Cambridge University Press, p. 139-150.


Summary:

This continental redbed sequence in the Permian basin of eastern NM and western TX was deposited unconformably on Upper Permian and is overlain by Cretaceous, Tertiary, or Quaternary sediments. Ranges in thickness from 70-700 m. A fauna was found in a quarry in Garza Co, TX that includes taxa previously unknown in the Triassic of North America. Age of Dockum thought to extend from late Carnian to early Norian. Reinstated as a formation. Divided into (ascending): Tecovas Member (formerly of formation rank), Trujillo Member (formerly of formation rank), and Cooper Member, a new name replacing use of Chinle Formation of Dockum Group in TX and NM. The name Chinle should not have been used for the upper part of the Dockum because Chinle is equivalent to all of the Dockum--a thought published in several earlier papers. Also Santa Rosa Sandstone should not be considered part of the Dockum. A fossil skull found in the basal bed of the Santa Rosa in the Tucumcari area has long been known from the Holbrook Member of the Moenkopi Formation in AZ. Dockum has phytosaur fossils of Late Triassic age. NICROSAURUS fauna found in Cooper Member in Garza Co and PARASUCHUS found in Tecovas Member. Stratigraphic diagrams.

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


Map showing publication footprint
  • Usage in publication:
    • Dockum Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Las Vegas-Raton basin
Publication:

Staatz, M.H., 1986, Geologic map of the Pine Buttes quadrangle, Colfax County, New Mexico: U.S. Geological Survey Geologic Quadrangle Map, GQ-1591, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_1117.htm]


Summary:

Mapped as a unit of formation rank and of Late Triassic age in central part of Temple Dome in secs 1, 2, 11 and 12, T26N, R26E, Colfax Co, NM in Las Vegas-Raton basin. Is the oldest formation in the quad; only upper part is present. Underlies Exeter Sandstone.

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


Map showing publication footprint
  • Usage in publication:
    • Dockum Group
  • Modifications:
    • Not used
Publication:

Lucas, S.G., Hunt, A.P., and Hayden, S.N., 1987, The Triassic System in the Dry Cimarron Valley, New Mexico, Colorado, and Oklahoma, IN Lucas, S.G., and Hunt, A.P., eds., Northeastern New Mexico: New Mexico Geological Society Field Conference Guidebook, no. 38, p. 97-117.


Summary:

Application of term "Dockum Group" rejected for the Baldy Hill, Travesser, and Sloan Canyon Formations, and Sheep Pen Sandstone in the Dry Cimarron valley of Union Co, NM. Name Dockum has been applied, according to these authors, to rocks of various lithologies and to rocks that represent various amounts of Triassic time. Also, Dockum as it was used in Union Co included strata not equivalent to the Dockum of TX.

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


Map showing publication footprint
  • Usage in publication:
    • Dockum Group*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Palo Duro basin
Publication:

Finch, W.I., 1988, Description of the principal reference section for the Santa Rosa Formation, IN Finch, W.I., ed., Principal reference section for the Santa Rosa Formation of Middle and Late Triassic age, Guadalupe County, New Mexico: U.S. Geological Survey Bulletin, 1804-A, p. 1-10.


Summary:

Basal formation of Dockum Group, the Santa Rosa Sandstone redescribed as Santa Rosa Formation because of its mudstone and conglomerate content in addition to sandstone. Age of Santa Rosa changed from Late Triassic to Middle and Late Triassic on basis of an amphibian skull of Anisian age in the lower sandstone member near Dilia, Guadalupe Co, NM. Plant fossils of Carnian age identified in mudstone member at principal reference section of Santa Rosa at N1/2 sec 1, T8N, R21E and SE1/4 SE1/2 sec 36, T9N, R22E and nearby, Guadalupe Co, NM. Report area is in the Palo Duro basin.

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


Map showing publication footprint
  • Usage in publication:
    • Dockum Group or Formation
  • Modifications:
    • Not used
Publication:

Lucas, S.G., and Hunt, A.P., 1989, Revised Triassic stratigraphy in the Tucumcari basin, east-central New Mexico, IN Lucas, S.G., and Hunt, A.P., eds., Dawn of the age of dinosaurs in the American southwest: New Mexico Museum of Natural History and Science, p. 150-170.


Summary:

Term not used for Upper Triassic rocks as a group or formation in San Miguel and Guadalupe Cos in east-central NM, Palo Duro basin; was not defined precisely. Term Chinle Formation not used because Upper Triassic rocks of east-central NM were deposited in a separate basin from the Chinle Formation of the Colorado Plateau. The Upper Triassic sequence formerly assigned to the Chinle or Dockum is divided into (ascending): Garita Creek (new), Trujillo (term used in preference to Cuervo, a name coined 65 years after the Trujillo), Bull Canyon (new), and Redonda (raised in stratigraphic rank to formation). Nomenclature chart.

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


Map showing publication footprint
  • Usage in publication:
    • Dockum Group
  • Modifications:
    • Mapped 1:250k
  • Dominant lithology:
    • Sandstone
    • Clay
    • Shale
    • Conglomerate
  • AAPG geologic province:
    • Palo Duro basin
    • Permian basin
Publication:

Barnes, V.E. (project director), 1993, Geologic atlas of Texas, Lubbock sheet [revision of 1967 ed.]: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, scale 1:250,000, Halbert Pleasant Bybee memorial edition [Also available in GIS format: Texas Comm. Env. Quality (TCEQ), Austin, TX, 15-minute Digital GAT (Geologic Atlas of Texas) Quads, v. 3/01/2004, NW CD-ROM. GIS files, browse graphics: http://www.beg.utexas.edu/mainweb/services/15minquads.htm]


Summary:

Is Triassic group mapped in mostly continuous, southward-broadening belt below Caprock Escarpment in west-central part of map sheet in southwest Motley Co, TX (Palo Duro basin) and in western Dickens, southeast and southern Crosby, southeast Lubbock, southeast Lynn, Garza, and western Kent Cos, TX (northeastern Permian basin). Overlies Quartermaster Formation (Permian); overlain by Antlers Sand (Lower Cretaceous). Map unit described as sandstone, clay, shale, and conglomerate. Sandstone, fine- to coarse-grained quartz, micaceous silty, thin-bedded to massive, cross-bedded, well indurated, greenish gray, brownish red. Clay, sandy, silty, reddish brown. Shale, sandy, locally calcareous, indistinctly bedded, various shades of red, green, gray, yellow. Conglomerate of various colored chert pebbles common in lower part; basal conglomerate also contains quartz, sandstone slabs, and petrified wood. Thickness 400+/-ft, locally absent in Motley Co, TX.

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


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