Borehole I-MU-I-MA, Sample 4: Late/Upper Albian - Early/Lower Cenomanian, Brazil
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Retitricolpates indet.
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9 specimens | ||||||
Tetradites sp.
Van der Hammen 1954
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3 specimens | ||||||
Pollen indet.
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4 specimens | ||||||
Dinoflagellates indet.
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5 specimens | ||||||
Foraminifera indet.
Eichwald 1830
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24 specimens | ||||||
Reticulatasporites jardinus
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Equisetopsida
- Cheirolepidiaceae
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Classopollis informal greaterthanthirty
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56 specimens | ||||||
Classopollis informal lessthanthirty
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3 specimens | ||||||
unclassified
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Psilatricolpites spp.
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25 specimens | ||||||
Retitricolpites operculatus
Herngreen 1973
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4 specimens | ||||||
Gnetaceaepollenites diversus
Stover 1964
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2 specimens | ||||||
Sofrepites legouxae
Jardiné 1967
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Striatricolpites sp.
Van der Hammen 1956
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2 specimens | ||||||
nomen nudum belonging to Plantae | |||||||
Verrutriletes informal sp. 1
Pierce 1961
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1 specimen | ||||||
Cycadopsida
- Gnetales
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Elaterosporites klaszi
Jardiné 1967
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Elaterocolpites castelaini
Jardiné and Magloire 1962
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1 specimen | ||||||
Ginkgoopsida
- Ephedrales
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Ephedripites barghoorniistaplinii
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3 specimens | ||||||
Ephedripites jansonii
Muller 1968
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Angiospermae
- Buxales
- Didymelaceae
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Hexaporotricolpites emelianovi
Boltenhagen 1967
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2 specimens | ||||||
Angiospermae
- Austrobaileyales
- Trimeniaceae
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Cretacaeiporites polygonalis
Herngreen 1974
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35 specimens | ||||||
Cretacaeiporites muellerii
Herngreen 1973
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10 specimens | ||||||
Cretacaeiporites scabratus
Herngreen 1974
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29 specimens | ||||||
Magnoliopsida
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Psilatricolporites sp.
Pierce 1961
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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: | 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: | 105.30000 - 93.50000 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: | 144218 | ||
Authorizer: | C. Jaramillo | Enterer: | G. Doria | Research group: | paleobotany |
Created: | 2013-05-02 10:17:03 | Last modified: | 2013-05-01 19:17:03 |
Access level: | the public | Released: | 2013-05-02 10:17:03 |
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] |