Tumbadero section, Sierra de los Organos, western Cuba - II (Jurassic of Cuba)

Where: Cuba (22.3° N, 84.1° W: paleocoordinates 5.0° N, 52.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: El Americano Member (Guasasa Formation), Tithonian (152.1 - 145.0 Ma)

• El Americano Member (?)

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified grainstone and lithified, sandy, calcareous shale

• The Lower Tithonian strata of the Sierra de los Organos were laid down in a shallow, poorly ventilated sea. At the end of the Early Tithonian, the conditions of sedimentation changed slightly, mainly due to moderate deepening of the basin. In the Late Tithonian the basin was apparently shallower and the energy of the environment increased.
• ca 1.5 m. Grey and dark-grey detrital sparitic limestone with intercalations of arenaceous limestone and thin lenses of marly-arenaceous shale. Ammonites usually preserved as molds embedded in the marly-arenaceous lenses or in the outer surfaces of the limestone layers.

Size class: macrofossils

Preservation: mold/impression

Primary reference: R. Myczynski. 1989. Ammonite biostratigraphy of the Tithonian of Western Cuba. Annales Societatis Geologorum Poloniae 59:43-125 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 57191: authorized by Martin Aberhan, entered by Sabine Nürnberg on 09.12.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Perisphinctidae
Aulacosphinctoides sp., ? Pachysphinctes sp., Torquatisphinctes aff. torquatus, Nebrodites (? Mesosimoceras) sp.
? Pachysphinctes sp. Dietrich ammonite
Torquatisphinctes aff. torquatus Sowerby 1840 ammonite