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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Eagle Ford shales*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Ouachita folded belt
Publication:

Hill, R.T., 1887, The topography and geology of the Cross Timbers and surrounding regions in northern Texas: American Journal of Science, 3rd series, v. 33, p. 291-303.


Summary:

Pg. 298. Eagle Ford shales. Argillaceous shales, varying from blue at top to yellow in middle and blue at base, with marked faunal zones. Overlies Timber Creek group [Woodbine sand] and underlies Dallas limestone [Austin chalk]. Age is Late Cretaceous (Gulf).
Named from exposures at Eagle Ford, Dallas Co., northeastern TX.

Source: US geologic names lexicon (USGS Bull. 896, p. 650).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford group*
  • Modifications:
    • Revised
Publication:

Adkins, W.S., 1933, The Mesozoic systems in Texas, Part 2, IN Sellards, E.H., Adkins, W.S., and Plummer, F.B, The geology of Texas; Volume 1, Stratigraphy: University of Texas Bulletin, no. 3232, p. 239-518., Published July, 1933


Summary:

Pg. 425-426. Eagle Ford group. Divided into (ascending) Tarrant, Britton, and Arcadia Park formations. Names credited W.L. Moreman. [Age is Late Cretaceous (Gulf).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1194-1195).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford shale*
    • Eagle Ford clay*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Gulf Coast basin
    • Arkla basin
    • East Texas basin
    • Strawn basin
    • Ouachita folded belt
    • Permian basin
    • Fort Worth syncline
    • South Oklahoma folded belt
Publication:

Wilmarth, M.G., 1935, [Selected Geologic Names Committee remarks (ca. 1935-1938) on Cretaceous rocks of the U.S.], 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:

Eagle Ford shale (also clay). Recognized in Texas, western Louisiana, and southeastern Oklahoma. In most early reports the name Eagle Ford clay was used to include Bonham clay and Blossom sand of present [ca. 1938] nomenclature, but it is now restricted to the beds beneath Ector tongue of Austin chalk. According to L.W. Stephenson (AAPG Bull., v. 13, Oct. 1912), the Eagle Ford is unconformable with overlying Austin chalk and with underlying Woodbine sand. Age is Late Cretaceous (Gulf).

Source: US geologic names lexicon (USGS Bull. 896, p. 650).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford formation*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Ouachita folded belt
Publication:

Albritton, C.C., Jr. (chairman), 1941, Geology of Dallas County, Texas: Field and Laboratory, v. 10, no. 1, p. 1-134., Dallas Petroleum Geologists General Committee, C.C. Albritton, Jr., chairman. Bulletin dedicated to memory of Robert T. Hill.


Summary:

Pg. 17-42, pls. 1, 3. Eagle Ford formation. Moreman's subdivisions not recognized in area of this report [Dallas County]. Underlies Austin formation. Chiefly clay-shale. Average thickness 475 feet. [Age is Late Cretaceous (Gulf).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1194-1195).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford shale*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • East Texas basin
    • Fort Worth syncline
    • Gulf Coast basin
    • Ouachita folded belt
    • Permian basin
    • Strawn basin
Publication:

Stephenson, L.W., King, P.B., Monroe, W.H., and Imlay, R.W., 1942, Correlation of the outcropping Cretaceous formations of the Atlantic and Gulf Coastal Plain and Trans-Pecos Texas: Geological Society of America Bulletin, v. 53, no. 3, p. 435-448.


Summary:

Chart 9. Shown on correlation chart as Eagle Ford shale. Overlies Woodbine sand; underlies Austin chalk. [Recognized notably in Texas. Age is Late Cretaceous (Gulfian).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1194-1195).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Strawn basin
Publication:

Hazzard, R.T., Blanpied, B.N., and Spooner, W.C., 1945, Notes on correlations of the Cretaceous of east Texas, south Arkansas, north Louisiana, Mississippi, and Alabama: Shreveport Geological Society Reference Report, v. 2, p. 472-481., [1947]


Summary:

Pg. 472, 473, 474, 475, 477, 480 (correlation chart). Eagle Ford formation of Woodbine group (surface and subsurface). Includes Tarrant member. Overlies Lewisville formation with unconformity; underlies Ector chalk of Austin group with unconformity. [Age is Late Cretaceous (Gulf).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1194-1195).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford shale*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Ouachita folded belt
Publication:

Stephenson, L.W., 1953, Mollusks from the Pepper shale member of the Woodbine formation, McLennan County, Texas, IN Shorter contributions to general geology, 1952: U.S. Geological Survey Professional Paper, 243-E, p. E57-E67. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp243E]


Summary:

Pg. 58. Eagle Ford shale unconformably overlies Pepper shale member of Woodbine formation at type section of Pepper shale. [Age is Late Cretaceous (Gulf).]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1194-1195).


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford Formation
  • Modifications:
    • Mapped 1:250k
  • Dominant lithology:
    • Shale
    • Sandstone
    • Limestone
    • Sand
    • Tuff
  • AAPG geologic province:
    • Ouachita folded belt
Publication:

Barnes, V.E. (project director), 1966, Geologic atlas of Texas, Texarkana sheet: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, scale 1:250,000, Elias H. Sellards memorial edition


Summary:

Eagle Ford Formation. At western edge of sheet, shale, bituminous, selenitic, calcareous concretions and septaria, medium- to dark-gray; a few thin platy beds of sandstone and sandy limestone, most abundant near middle; marine megafossils; thickness 350 feet. Near Lamar-Red River County line, grades mostly to quartz sand, fine- to coarse-grained, some cross-bedding, light-gray, near middle some tuff, conglomerate locally at base; thickness 60 feet, feathers out eastward. Lies above Woodbine Group, undivided, and below Bonham Formation. Age is Late Cretaceous.
[Mapped in northwestern part of map sheet, south of Red River, in Fannin, Lamar, and Red River Cos., northeastern TX.]

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford Group
  • Modifications:
    • Mapped 1:250k
  • AAPG geologic province:
    • Permian basin
    • Ouachita folded belt
Publication:

Barnes, V.E. (project director), 1977, Geologic atlas of Texas, Del Rio sheet: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, scale 1:250,000, Robert Thomas Hill memorial edition


Summary:

Is Upper Cretaceous unit mapped in southeastern Val Verde Co, TX (southern part of Permian basin) and central Kinney and east-central Uvalde Cos, TX (Ouachita tectonic belt province). Facies change westward is gradual from Eagle Ford Group to Boquillas Flags; nomenclature change arbitrarily placed at Devils River, Val Verde Co. Overlies Buda Limestone; overlain by Austin Chalk. Map unit described as shale, siltstone, and limestone; upper part, limestone and shale, limestone light yellowish-brown, flaggy; lower part, siltstone and very fine grained sandstone, light-yellow to gray, laminated, flaggy, some limestone, silty, medium-brown, laminated; thickness 75-200 ft, thins northeastward.

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


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford Group
  • Modifications:
    • Mapped 1:250k
  • Dominant lithology:
    • Shale
    • Siltstone
    • Limestone
  • AAPG geologic province:
    • Ouachita folded belt
Publication:

Barnes, V.E. (project director), 1982, Geologic atlas of Texas, San Antonio sheet [revision of 1974 ed.]: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, 1 sheet, [9 p., revised 1983], scale 1:250,000, Robert Hamilton Cuyler memorial edition


Summary:

Pamphlet [p. 5]. Eagle Ford Group, undivided. Shale, siltstone, and limestone; upper part limestone and shale, limestone light-yellowish brown, flaggy; lower part siltstone and very fine-grained sandstone, light-yellow to gray, laminated, flaggy, some limestone, silty, medium-brown, laminated. Thickness 30 to 75 feet; thickest in western Uvalde County. Lies above Buda Limestone and below Austin Chalk. Age is Late Cretaceous.
[Mapped in Uvalde, Medina, Bexar, Comal, and Hays Cos., TX.]

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford Group
  • Modifications:
    • Mapped 1:250k
  • Dominant lithology:
    • Shale
    • Sandstone
    • Limestone
  • AAPG geologic province:
    • Fort Worth syncline
    • Ouachita folded belt
    • Strawn basin
Publication:

Barnes, V.E. (project director), 1987, Geologic atlas of Texas, Dallas sheet [revision of 1972 ed.]: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, 1 sheet, [10 p., revised 1988], scale 1:250,000, Gayle Scott memorial edition


Summary:

Eagle Ford Group undivided. North of Hill County, eastern Texas, shale, sandstone, and limestone; shale, bituminous, selenitic, with calcareous concretions and large septaria; sandstone and sandy limestone in upper and middle parts, platy, burrowed, medium to dark gray; in lower part bentonitic; hard limestone bed marks base in Ellis and Johnson Counties; locally forms low cuesta. Thickness 200 to 300 feet. Lies above Woodbine Formation and below Austin Chalk. Age is Late Cretaceous.
[Mapped in Dallas, Denton, Ellis, Hill, Johnson, and Tarrant Cos., eastern TX.]

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford Group*
  • Modifications:
    • Biostratigraphic dating
  • AAPG geologic province:
    • Ouachita folded belt
    • Strawn basin
Publication:

Cobban, W.A., 1988, Tarrantoceras Stephenson and related ammonoid genera from Cenomanian (Upper Cretaceous) rocks in Texas and the Western Interior of the United States: U.S. Geological Survey Professional Paper, 1473, 51 p.


Summary:

Collections from lower part at USGS Mesozoic localities 14583 and 24510, Johnson Co, TX and 11740 and D12626, Tarrant Co, TX in Strawn basin yield ammonite TARRANTOCERAS SELLARDSI. Tarrant Formation of Eagle Ford Group near Round Rock, Williamson Co, TX in Ouachita tectonic belt province yields holotype of T. SELLARDSI. Fauna is assignable to late middle Cenomanian (Late Cretaceous) CUNNINGTONICERAS AMPHIBOLUM AMPHIBOLUM subzone of C. AMPHIBOLUM zone. Britton Formation of Eagle Ford Group in Ellis Co, TX in Ouachita tectonic belt province yields SUMITOCERAS CONLINI and is thus assignable to middle late Cenomanian (Late Cretaceous) SCIPONOCERAS GRACILE zone.

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


Map showing publication footprint
  • Usage in publication:
    • Eagle Ford Formation
  • Modifications:
    • Mapped 1:250k
  • Dominant lithology:
    • Shale
    • Sandstone
    • Limestone
  • AAPG geologic province:
    • Fort Worth syncline
    • Ouachita folded belt
    • South Oklahoma folded belt
Publication:

Barnes, V.E. (project director), 1991, Geologic atlas of Texas, Sherman sheet [revision of 1967 ed.]: University of Texas-Austin, Bureau of Economic Geology Geologic Atlas of Texas, 1 sheet, [17 p.], scale 1:250,000, Walter Scott Adkins memorial edition


Summary:

Pamphlet [p. 3]. Eagle Ford Formation. In Texas, shale, medium- to dark-gray, selenitic, bituminous, calcareous concretions and septaria common, some thin platy beds of sandstone and sandy limestone in middle and upper parts, marine megafossils, thickness 300 to 400 feet. Lies above Woodbine Formation and below Austin Group. Age is Late Cretaceous.
In Oklahoma, only lower 25 feet of formation is exposed; composed of limestone, bluish-gray, weathers to yellow, silty, thin-bedded, flaggy, thin beds of blue calcareous siltstone and blue silty shale.
[Mapped in eastern half of map sheet, in Collin, Denton, Fannin, and Grayson Cos., northeastern TX, and Bryan Co., southeastern OK.

Source: Publication.


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).