Upper Cretaceous (Maestrichtian) larger invertebrates fossils from the Haustator bilira Assemblage Zone in the West Gulf Coastal Plain

The ostracode assemblage of the Arkadelphia Formation, upper Maastrichtian, of southwestern Arkansas is characterized by a well-preserved, relatively diverse, and abundant fauna representing 36 podocopid species and an undetermined number of species of the platycopid genus Cytherella. Thirteen of these account for 85 percent of the fauna. The dominant forms are Cytherella spp., Brachycythere rhomboidalis (Berry, 1925), Haplocytheridea renfroensis Crane, 1965, Haplocytheridea bruceclarki (Israelsky, 1929), and Brachycythere ovata (Berry, 1925), which account for about 57 percent of the specimens found. Other species that are less common, but are characteristic of the Arkadelphia, are Antibythocypris macropora (Alexander, 1929), Ascetoleberis hazardi (Israelsky, 1929), Aversovalva fossata (Skinner, 1956), Brachycythere ledaforma (Israelsky, 1929), Curfsina communis (Israelsky, 1929), Cytheromorpha arbenzi (Skinner, 1956), Escharacytheridea micropunctata (Alexander, 1929), and Veenia arachoides (Berry, 1925). The ostracode assemblage indicates that the Arkadelphia was deposited in the inner sublittoral zone.The species Veenia parallelopora (Alexander, 1929) and Brachycythere foraminosa Alexander, 1934, are restricted to the Arkadelphia Formation and allow correlation with other Gulf Coastal Plain Upper Cretaceous units. A new ostracode interval zone, the Veenia parallelopora Zone, is proposed. This zone divides the Platycosta lixula Zone.Calcareous planktic microfossils reported from the Arkadelphia and its correlatives in the Veenia parallelopora Zone indicate that these deposits are late Maastrichtian in age, not middle Maastrichtian as some authors have thought.

Download Full-text

Paleontologic Characteristics of Systems Tracts in Upper Cretaceous Depositional Sequences in the Eastern Gulf Coastal Plain: ABSTRACT

AAPG Bulletin ◽

10.1306/522b33a3-1727-11d7-8645000102c1865d ◽

1996 ◽

Vol 80 ◽

Author(s):

Ernest A. Mancini, T. Markham Pucke

Keyword(s):

Coastal Plain ◽

Upper Cretaceous ◽

Gulf Coastal Plain ◽

Depositional Sequences

Download Full-text

TAXONOMY AND PALEOECOLOGY OF RUDIST BIVALVES FROM UPPER CRETACEOUS STRATA, GULF COASTAL PLAIN, USA

10.1130/abs/2020am-359064 ◽

2020 ◽

Author(s):

Alex Zimmerman ◽

◽

Claudia Johnson ◽

George E. Phillips ◽

Dana J. Ehret

Keyword(s):

Coastal Plain ◽

Upper Cretaceous ◽

Gulf Coastal Plain ◽

Rudist Bivalves

Download Full-text

Group size and nest success in Red-cockaded Woodpeckers in the West Gulf Coastal Plain: helpers make a difference

Journal of Field Ornithology ◽

10.1648/0273-8570-75.1.74 ◽

2004 ◽

Vol 75 (1) ◽

pp. 74-78 ◽

Cited By ~ 12

Author(s):

Richard N. Conner ◽

Daniel Saenz ◽

Richard R. Schaefer ◽

James R. McCormick ◽

D. Craig Rudolph ◽

...

Keyword(s):

Group Size ◽

Coastal Plain ◽

Nest Success ◽

Gulf Coastal Plain ◽

The West

Download Full-text

New Ostracoda species from an Upper Cretaceous oyster reef, northern Gulf Coastal Plain, U.S.A.

Journal of Paleontology ◽

10.1017/s0022336000034302 ◽

1994 ◽

Vol 68 (6) ◽

pp. 1321-1335 ◽

Cited By ~ 7

Author(s):

T. Markham Puckett

Keyword(s):

New Species ◽

Late Cretaceous ◽

Coastal Plain ◽

Upper Cretaceous ◽

Oyster Reef ◽

Oyster Reefs ◽

Total Thickness ◽

Topographic Feature ◽

Gulf Coastal Plain ◽

Eutaw Formation

This paper describes new species of Ostracoda from Late Cretaceous (late Santonian) oyster reefs of the Eutaw Formation of eastern Alabama. The reefs are composed almost exclusively of Ostrea cretacea Morton, with rarer occurrences of the oysters Exogyra upatoiensis Stephenson and Lopha ucheensis (Stephenson) and the bivalve Anomia preolmstedi Stephenson. Total thickness of the reefs is about 30 m, and the reefs are a major topographic feature across most of Macon and Russell Counties, Alabama, a distance of about 60 km. The reefs are interpreted to have been backbarrier sediments deposited under brackish conditions.Eight species of ostracodes are identified, including five new species described herein. The fauna is typically well preserved, and includes males, females, and juveniles. New species include Haplocytheridea? eutawensis, Antibythocypris dimorphicus, A. nephotrema, Brachycythere asymmetrica, and Eocytheropteron mutafoveata. Also discussed and illustrated are Cytherella tuberculifera Alexander, Haplocytheridea renfroensis renfroensis Crane, and Fissocarinocythere gapensis (Alexander).

Download Full-text