Borehole 2-Bast-I-MA, Sample 9, 458-460 m (Cretaceous of Brazil)

Also known as Barreirinhas (BA) Borehole

Where: Barreirinhas, Brazil (2.8° S, 42.8° W: paleocoordinates 9.6° S, 17.7° W)

• coordinate stated in text

When: Zone III pollen zone, Barreirinhas Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

Environment/lithology: marine; lithified, argillaceous, silty limestone and lithified, argillaceous shale

• The section 250-875 m consists of (silty) limestone with some marlstones or shale layers. From 875-1870 m there is a slight increase of the clay contnt: silty limestones preominate with intercalations of shales and marls.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: chemical, hydrochloric, hydroflouric, sieve

Primary reference: G. F. W. Herngreen. 1975. Palynology of the Middle and Upper Cretaceous strata in Brazil. Medelingen Rijks Geologische Dienst, Nieuwe Serie 26:39-91 [C. Jaramillo/G. Doria/A. Cardenas ]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 144296: authorized by Carlos Jaramillo, entered by Gabriela Doria on 03.05.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Psilatricolpates spp., Retitricolpates spp.
Equisetopsida
 Pinidae - Pinidae
Classopollis "largerthanthirty"
Classopollis "largerthanthirty" Pflug 1953
mainly C. brasiliensis nov. nom.
Angiospermae
 Austrobaileyales - Trimeniaceae
Cretacaeiporites scabratus
 Buxales - Didymelaceae
Hexaporotricolpites emelianovi
Dicotyledoneae
  -
Triorites africaensis
Triorites africaensis Jardiné and Magloire 1965
Gnetaceaepollenites
  -
Gnetaceaepollenites diversus
Ginkgoopsida
 Ephedrales -
Ephedripites "straight ridges"
Ephedripites "straight ridges" Bolkhovitina and Potonié 1958
Elateroplicites africaensis
  -
Elateroplicites africaensis
Elateroplicites africaensis Herngreen 1973 elaterate