Borehole I-MU-I-MA, Sample 3: Late/Upper Albian - Early/Lower Cenomanian, Brazil

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Retitricolpates indet.
11 specimens
Pollen indet.
5 specimens
Dinoflagellates indet.
17 specimens
Gnetaceaepollenites diversus Stover 1964
3 specimens
Galeacornea causea Stover 1963
Forma A
Equisetopsida - Cheirolepidiaceae
Classopollis informal greaterthanthirty
78 specimens
unclassified
Psilatricolpites spp.
16 specimens
Retitricolpites operculatus Herngreen 1973
2 specimens
Reticulatasporites jardinus
Cycadopsida - Gnetales
Steevesipollenites binodosus Stover 1964
3 specimens
Elaterocolpites castelaini Jardiné and Magloire 1962
Ginkgoopsida - Ephedrales
Ephedripites barghoorniistaplinii
1 specimen
Ephedripites informal sp. 9 Bolkhovitina and Potonié 1958
1 specimen
Magnoliopsida
Psilatricolporites sp. Pierce 1961
Angiospermae - Buxales - Didymelaceae
Hexaporotricolpites potoniei Boltenhagen 1969
1 specimen
Hexaporotricolpites emelianovi Boltenhagen 1967
4 specimens
Angiospermae - Austrobaileyales - Trimeniaceae
Cretacaeiporites scabratus Herngreen 1974
18 specimens
Cretacaeiporites muellerii Herngreen 1973
8 specimens
Cretacaeiporites polygonalis Herngreen 1974
31 specimens
Lycopsida
Uvaesporites sp. Döring 1965
unclassified
Verrutriletes spp.
1 specimen
Foraminifera indet. Eichwald 1830
37 specimens
Elateroplicites africaensis Herngreen 1973
2 specimens
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:144217
Authorizer:C. Jaramillo Enterer:G. Doria
Research group:paleobotany
Created:2013-05-02 10:13:57 Last modified:2013-05-01 19:13:57
Access level:the public Released:2013-05-02 10:13:57
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]