SE James Ross Island - Member 2 [Rabot Mbr, Santa Marta Fm] (Cretaceous of Antarctica)

Where: Antarctica (64.2° S, 57.8° W: paleocoordinates 62.0° S, 68.5° W)

• coordinate stated in text

• local area-level geographic resolution

When: Rabot Member (Santa Marta Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• STRATIGRAPHIC RELATIONS: From the Rabot Mbr of the Santa Marta Fm, which is locally overlain by the López de Bertodano Fm (Campanian-Maastrichtian). The Rabot Mbr of Crame et al. (1991) is raised to formation rank by Marenssi et al. (1992), but the former lithostratigraphic nomenclature is used by the enterer AGE: Late Campanian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From middle "member 2" of the Rabot Member.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified siltstone

• ENVIRONMENT: Offshore siliciclastic marine setting.
• SPECIFIC LITHOLOGY: Siltstone and rare thin sandstone beds, on the basis of Fig. 2 of Marenssi et al. (1992). LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: COLLECTOR: Multiple collectors, including the authors. REPOSITORY: Not stated, but presumably the Centro de Investigaciones en Recurso Geologicos (CIRGEO)..

Primary reference: S. A. Marenssi, J. M. Lirio, S. N. Santillana, D. R. Martinioni, and S. Palamarczuk. 1992. El Cretacio Superior del sudeste de la Isla James Ross, Antartida. Geologia de la Isla James Ross 77-88 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 83390: authorized by Austin Hendy, entered by Austin Hendy on 19.08.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: COVERAGE: Exhaustive for ammonoidea and bivalvia. NOMENCLATURE: Not an authoritative publication, but with fairly modern nomenclature and species-resolution identifications where listed.
Cephalopoda
 Ammonitida - Diplomoceratidae
Polyptychoceras sp. Yabe 1927 ammonite
"Parasolenoceras sp." = Pseudoxybeloceras (Parasolenoceras) Collignon 1969 ammonite
 Ammonitida - Ptychoceratidae
Ptychoceras sp. d'Orbigny 1842 ammonite
 Ammonitida - Kossmaticeratidae
? Maorites sp. Marshall 1926 ammonite
 Ammonitida - Pachydiscidae
Pachydiscus sp. Zittel 1884 ammonite
Menuites sp. Spath 1922 ammonite
 Ammonitida - Placenticeratidae
Metaplacenticeras sp. Spath 1926 ammonite
Hoplitoplacenticeras sp. Paulcke 1906 ammonite
Hoplitoplacenticeras plasticum Paulcke 1906 ammonite
SUBSPECIES: Hoplitoplacenticeras plasticum plasticum
 Ammonitida - Tetragonitidae
Zelandites cf. kaiparaensis Marshall 1926 ammonite
Gaudryceras varagurense Kossmat 1895 ammonite
SUBSPECIES: Gaudryceras varagurense patagonicum
Gaudryceras cf. crassicostatum Jimbo 1894 ammonite
Gaudryceras propemite Marshall 1926 ammonite
Anagaudryceras subsacya Marshall 1926 ammonite
Tetragonites sp. Kossmat 1895 ammonite
"Pseudophyllites peregrinus" = Pseudophyllites latus Marshall 1926 ammonite
 Phylloceratida - Phylloceratidae
Neophylloceras sp. Shimizu 1934 ammonite
Bivalvia
 Myalinida - Inoceramidae
Inoceramus sp. Sowerby 1814 clam