Marlbrook Marl Explained

Marlbrook Marl
Type:	Formation
Age:	Cretaceous
Namedby:	Robert Thomas Hill^[1]
Region:	Arkansas
Country:	United States
Underlies:	Saratoga Formation
Overlies:	Annona Chalk
Thickness:	50 to 220 feet ^[2]

The Marlbrook Marl is a geologic formation in Arkansas.^[2] It preserves fossils dating back to the Cretaceous period.

Paleofauna

Ostracods

• Alatacythere

A. pondersana^{[3] [4]}

• Amphicytherura

A. dubia^{[3] [4]}

• Bairda^[4]
• Bairdoppilata

B. pondera^[4]

• Brachycythere

B. ledaforma^{[3] [4]}

B. ovata^{[3] [4]}

B. rhomboidalis^{[3] [4]}

• Bythocypris

B. windhami^{[3] [4]}

• Clithrocytheridea

C. fabaformis^[3]

• Cythereis

C. costatana^[4]

C. hannai^[4]

• Cytherella

C. coryelli^[4]

C. navarroensis^[4]

C. scotti^[4]

• Cytherelloidea

C. austinensis^[4]

C. crafti^{[3] [4]}

C. greenensis^[4]

C. spiralia^[3]

C. tollettensis^[3]

• Cytheris

C. communis^[3]

C. costatana^[3]

C. filicosta^[3]

C. pidgeoni^[3]

C. tuberculifera^[3]

C. verricula^[3]

• Cytheropteron

C. blakei^[3]

C. castorensis^[4]

C. harrisi^[4]

• Echinocythereis

E. bartoni^{[3] [4]}

• Haplocytheridea

H. bruceclarki^{[3] [4]}

H. councilli^[4]

H. fabaformis^[4]

H. globosa^[3]

H. micropunctata^[3]

H. monmouthensis^[4]

H. plummeri^{[3] [4]}

• Krithe

K. cushmani^[3]

K. swaini^[4]

• Loxoconcha

L. fletcheri^{[3] [4]}

• Monoceratina

M. marssonitina^[4]

M. montuosa^[4]

M. pedata^[3]

M. prothroensis^[4]

• Morrowina^[3]
• Neocythere

N. (Neocythere) pseudoconcentrica^[4]

• Orthonotacythere

O. (Orthonotacythere) hannai^{[3] [4]}

O. (Orthonotacythere) polita^{[3] [4]}

• Paracypris

P. angusta^[4]

P. goodlandensis^[4]

• Pterygocythere

P. saratogana^{[3] [4]}

• Trachyleberis

T. communis^[4]

T. pideoni^[4]

• Veenia

V. arachoides^{[3] [4]}

V. ozanana^{[3] [4]}

• Xestoleberis

X. opina^[4]

Avians

• Hesperornis^[5]

See also

• List of fossiliferous stratigraphic units in Arkansas
• Paleontology in Arkansas

References

• Web site: Fossilworks: Gateway to the Paleobiology Database. ((Various Contributors to the Paleobiology Database)). 17 December 2021.

Notes and References

1. Hill. R.T.. Arkansas Geological Survey Annual Report for 1888. 1888. 2. 72, 84–86.
2. McFarland. John David. Stratigraphic summary of Arkansas. Arkansas Geological Commission Information Circular. 2004. 1998. 36. 27. 2018-01-12. https://web.archive.org/web/20161221195953/http://www.geology.ar.gov/pdf/IC-36_v.pdf. 2016-12-21. dead.
3. 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.
4. Benson. Richard H.. Tatro. James O.. 15 Dec 1964. Faunal description of Ostracoda of the Marlbrook Marl (Campanian), Arkansas. The University of Kansas Paleontological Contributions. Arthropoda, Article 7. 32, 6 pls.
5. Bell. Alyssa. Irwin. Kelly J.. Davis. Leo Carson. 2015. Hesperornithiform birds from the Late Creaceous (Campanian) of Arkansas, USA. Transactions of the Kansas Academy of Science. 118. 3/4. 219–229. 10.1660/062.118.0305. 24887762. 83921936. JSTOR.