Borehole 2-Bast-I-MA, Sample 5, 284-285 m: Late/Upper Cenomanian, Brazil
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Psilatricolpates spp.
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Retitricolpates spp.
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Hexaporoticolpites potoniei
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Retitricolpites operculatus
Herngreen 1973
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Equisetopsida
- Cheirolepidiaceae
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Classopollis informal largerthanthirty
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| mainly C. brasiliensis nov. nom. | ||||||||||
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Classopollis informal lessthanthirty
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unclassified
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Gnetaceaepollenites diversus
Stover 1964
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Cycadopsida
- Gnetales
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Elaterocolpites castelaini
Jardiné and Magloire 1962
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Elaterosporites klaszi
Jardiné 1967
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Steevesipollenites binodosus
Stover 1964
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Ginkgoopsida
- Ephedrales
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Ephedripites informal straight ridges
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Ephedripites jansonii
Muller 1968
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Angiospermae
- Austrobaileyales
- Trimeniaceae
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Cretacaeiporites scabratus
Herngreen 1974
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Cretacaeiporites polygonalis
Herngreen 1974
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Cretacaeiporites muellerii
Herngreen 1973
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Angiospermae
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Retimonocolpites sp.
Pierce 1961
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Triorites africaensis
Jardiné and Magloire 1965
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Angiospermae
- Buxales
- Didymelaceae
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Hexaporotricolpites emelianovi
Boltenhagen 1967
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unclassified
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Elateroplicites africaensis
Herngreen 1973
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| see common names | ||||||||||
Geography
| Country: | Brazil | State/province: | Barreirinhas |
| Coordinates: | 2.8° South, 42.8° West (view map) | ||
| Paleocoordinates: | 9.6° South, 17.7° West | ||
| Basis of coordinate: | stated in text |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| Key time interval: | Late/Upper Cenomanian | Pollen zone: | Zone III |
| Age range of interval: | 100.50000 - 93.90000 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: | 2013-05-02 16:01:27 |
| Access level: | the public | Released: | 2013-05-03 07:01:27 |
| Creative Commons license: | CC BY | ||
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] |