Lake Waco Formation

Lake Waco Formation
Stratigraphic range: Mid Cenomanian-Early Turonian
~96–93.5 Ma
[1]
TypeGeological formation
Unit ofEagle Ford Group
Sub-unitsBluebonnet Member, Cloice Member, Bouldin Member
UnderliesSouth Bosque Formation
OverliesPepper Shale
Lithology
PrimaryShale
OtherMarl, limestone, volcanic ash beds
Location
RegionEast Texas
Country United States
Type section
Named forLake Waco near Waco, Texas[2]
Named byAdkins and Lozo[2]

The Lake Waco Formation is a geologic formation within the Eagle Ford Group deposited during the Middle Cenomanian to the Early Turonian of the Late Cretaceous in central Texas.[1] The formation was named for outcrops near Lake Waco, south of the city of Waco, Texas by W. S. Adkins and F. E. Lozo in 1951.[2] The Lake Waco Formation is primarily composed of shale, with minor amounts of limestone and volcanic ash beds (bentonites). It is subdivided into three members: Bluebonnet Member, Cloice Member, and the Bouldin Member.[2] The Bluebonnet Member is 10 to 20 ft (3 to 6 m) thick, and is made up of broken pieces (prisms) of inoceramid clams and planktonic foraminifera.[3] The Cloice Member is 35 ft (11 m) thick at its type section on the Cloice Branch of the South Bosque River, whereas the Bouldin Member was named for outcrops on Bouldin Creek south of downtown Austin, where it is roughly 9 ft (3 m) thick. They are both made up of shales rich in organic matter with thin limestones and volcanic ash beds.[2]

Plesiosaur remains, shark's teeth, ammonites, and inoceramid clams are among the fossils that have been recovered from its strata.[3][4]


See also

References

  1. ^ a b Denne, R. A., Breyer, J. A., Callender, A. D., Hinote, R. E., Kariminia, M., Kosanke, T. H., Kita, Z., Lees, J. A., Rowe, H., Spaw, J. M., and Tur, N. (2016). Biostratigraphic and geochemical constraints on the stratigraphy and depositional environments of the Eagle Ford and Woodbine Groups of Texas: in Breyer, J. A. (ed.), The Eagle Ford Shale: A renaissance in U.S. oil production, AAPG Memoir 110, p. 1-86.
  2. ^ a b c d e Adkins, W. S., and F. E. Lozo, 1951, Stratigraphy of the Woodbine and Eagle Ford, Waco area, Texas, in F. E. Lozo, ed., The Woodbine and adjacent strata of the Waco area of central Texas, a symposium for the 1951 field trip sponsored by the East Texas Geological Society: Southern Methodist University Press, Fondren Science Series 2, Dallas, Texas, p. 101–163.
  3. ^ a b Silver, B. A. (1963) The Bluebonnet Member, Lake Waco Formation (Upper Cretaceous), Central Texas-A lagoonal deposit: Baylor Geologic Studies Bulletin 4, Waco, Texas, 46 p.
  4. ^ Thurmond, John T. (1968). "A New Polycotylid Plesiosaur from the Lake Waco Formation (Cenomanian) of Texas". Journal of Paleontology. 42 (5). jstor.org: 1289–1296. JSTOR 1302265.

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