PBDB Collection

Guiaco-Tamana Trinidad (Eocene to of Trinidad and Tobago)

Where: Trinidad and Tobago (10.6° N, 61.1° W: paleocoordinates 8.1° N, 51.4° W)

• coordinate estimated from map

When: Brasso Formation, Early/Lower Eocene to Early/Lower Eocene (55.8 - 37.7 Ma)

Environment/lithology: marine; lithified, massive, silty, sandy claystone

• The sedimentological log records two poorly-lithified sand and silt-rich sections the lowest 5 m and uppermost 5 m, respectively separated by an interval of claystones with thinner sands and variable quantities of mollusc (bivalve + gastropod) debris. The large masses of samples JBW-97 and JBW-116 are due to the large amounts of sand in the residues. Neither primary sedimentary structures nor trace fossils are found within the sandstones,but 2.5 m above the base of the study section one horizon within a bed of silt is conspicuously burrowed. The sand at the base of the section contains stringers of lignite. The soles of the sandstone beds are sharp and erosional, and two sand beds, both with hematite cement, occupy channels. The lower of these, 10 m above the study section base, commences within a lag deposit of mollusc fragments.

Size class: microfossils

Collection methods: The section studied was sampled in May 2003, samples JBW-97 through JBW-117 being taken at 1 m intervals. Their positions were recorded on a sedimentological log (Fig. 2). Due to vegetation growth in the interim, it was not possible in May 2003 to sample the whole of the upper subsection with sand-filled channels as described by Wilson (2003, 2004a).

Primary reference: B. Wilson. 2010. A lagoonal interlude with occasional hypersalinity in the deposition of the Early-Middle Miocene Brasso Formation of Trinidad. Journal of South American Earth Sciences 29:254-261 [M. Uhen/R. McClees-Funinan]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 140160: authorized by Mark Uhen, entered by Ricardo McClees-Funinan on 04.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

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unclassified
-	Amphistegina sp., Angulodiscorbis cf. corrugata, Massillina tenuissima Amphistegina sp. Angulodiscorbis cf. corrugata Massillina tenuissima
Foraminifera
Buliminoidea - Buliminidae	Bulimina bleekeri, Bulimina sp., Angulogerina occidentalis Bulimina bleekeri Bulimina sp. d'Orbigny 1826 Angulogerina occidentalis Cushman 1923
Ammodiscoidea - Ammodiscidae	Glomospira gordialis Glomospira gordialis
Planorbulinacea - Planorbulinidae	Planorbulinella trinitatensis, Planorbulina mediterranensis Planorbulinella trinitatensis Planorbulina mediterranensis d'Orbigny 1826
Rotaliina - Cassidulinidae	Cassidulina laevigata, Globocassidulina subglobosa Cassidulina laevigata Globocassidulina subglobosa
Rotaliina - Siphoninidae	Siphonina pulchra Siphonina pulchra
Rotaliacea - Rotaliidae	Ammonia cf. catesbyana Ammonia cf. catesbyana
Asterigerinacea - Amphisteginidae	Amphistegina gibbosa Amphistegina gibbosa d'Orbigny 1839
Buliminacea - Uvigerinidae	Uvigerina subperegrina, Uvigerina auberiana Uvigerina subperegrina Uvigerina auberiana d'Orbigny 1839
Buliminacea - Reusselidae	Reussella laevigata Reussella laevigata
Rotaliina - Fursenkoinidae	Fursenkoina sp. Fursenkoina sp. d'Orbigny 1846
Rotaliina - Bolivinidae	Brizalina compacta Brizalina compacta Brizalina alazanensis venezuelana, Brizalina marginata multicostata
Lituolida - Lituolidae	Textularia conica, Textularia framptoni, Textularia agglutinans Textularia conica Textularia framptoni Textularia agglutinans d'Orbigny 1839
Globothalamea
Rotaliida - Anomalinidae	Cibicidina antiqua, Anomalinoides mecatapecensis Cibicidina antiqua Anomalinoides mecatapecensis
Rotaliida - Nonionidae	Melonis pompilioides, Nonion sp., Pseudononion atlanticum, Pseudononion modesta, Pseudononion subgrateloupi Melonis pompilioides Nonion sp. Monfort 1808 Pseudononion atlanticum Pseudononion modesta Pseudononion subgrateloupi
Rotaliida - Cibicididae	Cibicidoides pseudoungerianus, Cibicidoides sp. Cibicidoides pseudoungerianus Cibicidoides sp.
Rotaliida - Discorbidae	Discorbis auberii, Discorbis tholus, Valvulineria cf. palmerae, Rosalina subaraucana, Hanzawaia carstensi, Hanzawaia mantaensis, Eponides parantillarum Discorbis auberii Discorbis tholus Valvulineria cf. palmerae Rosalina subaraucana Hanzawaia carstensi Hanzawaia mantaensis Eponides parantillarum McCulloch 1977
Rotaliida - Rosalinidae	Neoconorbina cf. patelliformis Neoconorbina cf. patelliformis
Foraminifera
Rotalioidea - Elphidiidae	Elphidium advenum, Elphidium sagrum Elphidium advenum Cushman 1922 Elphidium sagrum d'Orbigny 1839
Nodosariata
Vaginulinida - Vaginulinidae	Lenticulina acutistriata, Lenticulina cf. americana, Lenticulina falcifer, Lenticulina formosa, Lenticulina spp. Lenticulina acutistriata Lenticulina cf. americana Lenticulina falcifer Lenticulina formosa Lenticulina spp. Lamarck 1804
Nodosariida - Nodosariidae	Lagena acuticosta Lagena acuticosta Reuss 1862
Tubothalamea
Miliolida - Hauerinidae	Quinqueloculina auberiana, Quinqueloculina yaguatensis, Quinqueloculina seminulangulata, Quinqueloculina polygona, Quinqueloculina lamarckiana, Triloculina sp. Quinqueloculina auberiana Quinqueloculina yaguatensis Quinqueloculina seminulangulata McLean 1956 Quinqueloculina polygona d'Orbigny 1839 Quinqueloculina lamarckiana d'Orbigny 1839 Triloculina sp. d'Orbigny 1826