Valle del Ancón section, Sierra de los Organos, western Cuba - II (Jurassic of Cuba)

Where: Cuba (22.7° N, 83.8° W: paleocoordinates 5.3° N, 52.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: El Americano Member (Guasasa Formation), Late/Upper Tithonian (150.8 - 145.0 Ma)

• belongs to the upper part of the El Americano Formation; Upper Tithonian

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, shelly/skeletal, gray lime mudstone

• 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. 0.55 m. A bed of dark-grey coquinoid limestone, composed of broken ammonite shells in micritic matrix. The bed is bounded at top and bottom by grey-brown marly layers 4-6 cm thick which also include broken ammonites.

Size classes: macrofossils, microfossils

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 57204: 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 - Neocomitidae
Kossmatia cf. bifurcata
Kossmatia cf. bifurcata Aguilera 1895 ammonite
 Ammonitida - Perisphinctidae
Phanerostephanus sp.
 Ammonitida - Himalayitidae
Durangites aff. acanthicus
Durangites aff. acanthicus Burckhardt 1912 ammonite
 Ammonitida - Haploceratidae
? Haploceras sp., ? Haploceras aff. veracruzanum
? Haploceras sp. Zittel 1870 ammonite
? Haploceras aff. veracruzanum Cantu Chapa 1976 ammonite
 Ammonitida - Oppeliidae
Hildoglochiceras (Salinites) gallardoi, "Hildoglochiceras (Salinites) aff. inflatum" = Salinites inflatum, "Hildoglochiceras (Salinites) grossicostatum" = Salinites grossicostatum, ? Hildoglochiceras (Salinites) aff. ecarinatum
Hildoglochiceras (Salinites) gallardoi Chudoley and Furrazola 1968 ammonite
"Hildoglochiceras (Salinites) aff. inflatum" = Salinites inflatum Imlay 1939 ammonite
"Hildoglochiceras (Salinites) grossicostatum" = Salinites grossicostatum Imlay 1939 ammonite
  -
Lamellaptychus sp.
Lamellaptychus sp. Trauth 1927 ammonoid aptychus
Bivalvia
 Pectinida - Buchiidae
Buchia aff. okensis
Buchia aff. okensis Pavlow 1907 scallop
Protozoa
 Calpionellida -
Calpionellida indet.
  -
Radiolaria indet.