Back Rio Grande (locality 6) (Cretaceous of Jamaica)

Where: Portland , Jamaica (18.1° N, 76.5° W: paleocoordinates 19.4° N, 64.4° W)

When: Upper limestone Member (Back Rio Grande Formation), Campanian (83.6 - 72.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified limestone

• Exposures within a fault zone about 1 km downstream of the

•main section (Fig. 1) show extensive limestones with abundant

•stylolites (localities 5 and 6). At least 25 m of limestone is exposed;

•it yields the same rudist assemblage (C. cubensis, D. krijneni sp. nov.

•and Barrettia sp. A) as the main exposures of the upper limestone

•member (Fig. 7). Krijnen et al. (1993, fig. 14, ‘‘Back Rio Grande Stony

•River’’) recorded Pseudorbitoides rutteni and Vaughanina cubensis

•from our locality 5 and attributed the limestones at this exposure to

•the Rio Grande Formation.

Size class: macrofossils

Preservation: shellbed

Primary reference: S. F. Mitchell and R. Ramsook. 2009. Rudist bivalve assemblages from the Back Rio Grande Formation (Creaceous: Campanian) of Jamaica and their stratigraphic significance. Cretaceous Research 30:307-321 [M. Aberhan/D. Wellmanns]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 116616: authorized by Martin Aberhan, entered by Daniel Wellmanns on 09.09.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Hippuritida - Hippuritidae
Barrettia sp.
Barrettia sp. Woodward 1862 rudist
 Hippuritida - Radiolitidae
"Chiapasella cubensis" = Chiapasella radiolitiformis
"Chiapasella cubensis" = Chiapasella radiolitiformis Trechmann 1924 rudist
 Hippuritida - Antillocaprinidae
Antillosarcolites cf. macgillavryi