Borehole 2-Bast-I-MA, Sample 5, 284-285 m: Late Cenomanian, Brazil

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Equisetopsida - Cheirolepidiaceae
mainly C. brasiliensis nov. nom.
unclassified
Cycadopsida - Gnetales
Elaterocolpites castelaini Jardiné and Magloire 1962
Ginkgoopsida - Ephedrales
Angiospermae
Angiospermae - Austrobaileyales - Trimeniaceae
Angiospermae - Buxales - Didymelaceae
Angiospermae
Triorites africaensis Jardiné and Magloire 1965
unclassified
see common names

Geography
Country:Brazil State/province:Barreirinhas
Coordinates: 2.8° South, 42.8° West (view map)
Paleocoordinates:1.5° South, 8.2° West (Wright 2013)
Basis of coordinate:stated in text
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Cenomanian 10 m.y. bin: Cretaceous 5
Key time interval: Late Cenomanian Pollen zone:  Zone III
Age range of interval: 100.5 - 93.9 m.y. ago
Stratigraphy
Formation:Barreirinhas
Local section:BAst Local bed:228-230
Lithology and environment
Primary lithology: lithified argillaceous,silty "limestone"
Secondary lithology: lithified argillaceous "shale"
Lithology description: 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.
Environment:marine indet.
Taphonomy
Modes of preservation:soft parts,original sporopollenin
Size of fossils:microfossils
Collection methods and comments
Collection excludes:all microfossils
Collection methods:chemical,hydrochloric,hydroflouric,sieve
Reason for describing collection:biostratigraphic analysis
Metadata
Also known as:Barreirinhas (BA) Borehole
Database number:144294
Authorizer:C. Jaramillo Enterer:G. Doria
Research group:paleobotany
Created:2013-05-03 07:01:27 Last modified:2025-02-22 15:12:02
Access level:the public Released:2013-05-03 07:01:27
Creative Commons license:CC0
Reference information

Primary reference:
44836. 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. Cárdenas]