Annona Chalk

From Wikipedia, the free encyclopedia
Annona Chalk
Stratigraphic range: Cretaceous
Bulletin 429 Plate XVI A Annona Chalk.jpg
Outcrop east of Clarksville, TX (c. 1910)
TypeSedimentary
Sub-unitsAustin Group
UnderliesOzan Formation, Marlbrook Marl
OverliesBrownstown Marl, Ozan Formation
Thickness30 Meters
Lithology
PrimaryChalk
Location
RegionArkansas
CountryUnited States
Type section
Named forAnnona, Red River County, Texas[1]
Named byRobert Thomas Hill

The Annona Chalk is a geologic formation in Arkansas, Texas, Louisiana, and Oklahoma.[2] It preserves fossils dating back to the Cretaceous period. The formation is a hard, thick-bedded to massive, slightly fossiliferous chalk. It weathers white, but is blue-gray when freshly exposed. The unit is commercially mined for cement. Fossils in the Annona Chalk include coelenterates, echinoderms, annelids, bivalves, gastropods, cephalopods, and some vertebrate traces.[3] The beds range in thickness, up to over 100 feet in depth in some areas (such as the White Cliffs).[4] There is a gradual transition between the Annona chalk and the underlying Brownstown formation, where chalk and marl are interbedded.[5]

Exposures[]

  • Annona Chalk overlying Brownstown Marl at what is now called White Cliffs Natural Area, with the Little River in the foreground, Howard County, AR (c. 1910)

  • Another view of the same location (c. 1902)

  • Quarry at Whitecliffs Landing (c. 1902)

Paleofauna[]

Ammonites[]

B. crickmayi[6]
B. taylorensis[6]
D. binodosum[6]
D. clardyi[6]
N. (Nostoceras) danei[6]
N. (Nostoceras) monotuberculatum[6]
N. (Nostoceras) plerucostatum[6]
N. (Nostoceras) pulcher[6]
O. crassum[6]

Ostracods[]

A. ponderosana[7]
B. rotunda[7]
B. ovata[7]
B. windhami[7]
C. austinensis[7]
C. caudata[7]
C. communis[7]
C. filicosta[7]
C. paraustinensis[7]
C. crafti[7]
C. tollettensis[7]
C. blakei[7]
H. bruceclarki[7]
H. globosa[7]
H. micropunctata[7]
H. plummeri[7]
K. cushmani[7]
L. fletcheri[7]
M. montuosa[7]
M. pedata[7]
O. hannai[7]
P. texanus[7]
V. ozanana[7]

See also[]

References[]

  1. ^ Hill, R.T. (1894). "Geology of parts of Texas, Indian Territory and Arkansas adjacent to Red River". Bulletin of the Geological Society of America. 5: 308.
  2. ^ USGS Geolex, Annona Chalk/Formation
  3. ^ R. T. Hill. "ANNONA CHALK/FORMATION". Arkansas Geological Survey. v. 5: Arkansas Geological Survey. p. 308. Archived from the original on 1894. Retrieved 25 May 2015.{{cite web}}: CS1 maint: location (link)
  4. ^ Veatch, Arthur Clifford (1906). Geology and Underground Water Resources of Northern Louisiana and Southern Arkansas. U.S. Government Printing Office.
  5. ^ Matson, G. C., 1916, The Caddo Oil and Gas Field, Louisiana and Texas, USGS Bulletin 619
  6. ^ a b c d e f g h i j k l Kennedy, W. J.; Cobban, W. A. (1993). "Campanian ammonites from the Annona Chalk near Yancy, Arkansas". Journal of Paleontology. 67 (1): 83–97.
  7. ^ a b c d e f g h i j k l m n o p q r s t u v w x y Collins, Jr., Robert J. (June 1960). Stratigraphy and Ostracoda of the Ozan, Annona, and Marlbrook Formations of southwestern Arkansas (PhD). Louisiana State University and Agricultural and Mechanical College.


Stub icon

This article about a specific stratigraphic formation in Arkansas is a stub. You can help Wikipedia by .

  • v
  • t
Stub icon

This article related to the Cretaceous period is a stub. You can help Wikipedia by .

  • v
  • t
Retrieved from ""