Borehole I-MU-I-MA, Sample 2: Late/Upper Albian - Early/Lower Cenomanian, Brazil
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Retitricolpates indet.
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2 specimens | ||||||
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Pollen indet.
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1 specimen | ||||||
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Dinoflagellates indet.
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51 specimens | ||||||
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Foraminifera indet.
Eichwald 1830
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4 specimens | ||||||
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Angiospermae
- Austrobaileyales
- Trimeniaceae
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Cretacaeiporites scabratus
Herngreen 1974
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1 specimen | ||||||
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Cretacaeiporites polygonalis
Herngreen 1974
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4 specimens | ||||||
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Angiospermae
- Buxales
- Didymelaceae
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Hexaporotricolpites emelianovi
Boltenhagen 1967
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2 specimens | ||||||
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Hexaporotricolpites potoniei
Boltenhagen 1969
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1 specimen | ||||||
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unclassified
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Psilatricolpites spp.
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1 specimen | ||||||
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Equisetopsida
- Cheirolepidiaceae
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Classopollis informal greaterthanthirty
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11 specimens | ||||||
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unclassified
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Gnetaceaepollenites diversus
Stover 1964
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1 specimen | ||||||
| see common names | |||||||
Geography
| Country: | Brazil | State/province: | Maranhao |
| Coordinates: | 2.6° South, 42.8° West (view map) | ||
| Paleocoordinates: | 9.7° South, 17.1° West | ||
| Basis of coordinate: | stated in text |
Time
| Period: | Cretaceous | ||
| Key time interval: | Late/Upper Albian - Early/Lower Cenomanian | Pollen zone: | Zone II, Reyrea polymorphus |
| Age range of interval: | 106.20000 - 93.90000 m.y. ago |
Stratigraphy
| Stratigraphy comments: The interpretation of the Schlumberger logs by
PETROBRAS is apparently of a provisional character and shows many questional formation and member subdivisions. For these reasons these lithologic units are not used in order to avoid confusion with those established and published by PAMPLONA (1971). |
Lithology and environment
| Primary lithology: | lithified argillaceous "shale" |
| Secondary lithology: | lithified argillaceous sandstone |
| Lithology description: The lithology of the lower ca. 825 metres consists mainly of shales alternating with some sandstones. | |
| Environment: | terrestrial 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: | Mandacaru borehole | ||
| Database number: | 144216 | ||
| Authorizer: | C. Jaramillo | Enterer: | G. Doria | Research group: | paleobotany |
| Created: | 2013-05-02 10:10:31 | Last modified: | 2013-05-01 19:10:31 |
| Access level: | the public | Released: | 2013-05-02 10:10:31 |
| 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] |