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
Retitricolpates indet.
9 specimens
Tetradites sp. Van der Hammen 1954
3 specimens
Pollen indet.
4 specimens
Dinoflagellates indet.
5 specimens
Foraminifera indet. Eichwald 1830
24 specimens
Reticulatasporites jardinus
Equisetopsida - Cheirolepidiaceae
Classopollis informal greaterthanthirty
56 specimens
Classopollis informal lessthanthirty
3 specimens
unclassified
Psilatricolpites spp.
25 specimens
Retitricolpites operculatus Herngreen 1973
4 specimens
Gnetaceaepollenites diversus Stover 1964
2 specimens
Sofrepites legouxae Jardiné 1967
Striatricolpites sp. Van der Hammen 1956
2 specimens
nomen nudum belonging to Plantae
Verrutriletes informal sp. 1 Pierce 1961
1 specimen
Cycadopsida - Gnetales
Elaterosporites klaszi Jardiné 1967
Elaterocolpites castelaini Jardiné and Magloire 1962
1 specimen
Ginkgoopsida - Ephedrales
Ephedripites barghoorniistaplinii
3 specimens
Ephedripites jansonii Muller 1968
Angiospermae - Buxales - Didymelaceae
Hexaporotricolpites emelianovi Boltenhagen 1967
2 specimens
Angiospermae - Austrobaileyales - Trimeniaceae
Cretacaeiporites polygonalis Herngreen 1974
35 specimens
Cretacaeiporites muellerii Herngreen 1973
10 specimens
Cretacaeiporites scabratus Herngreen 1974
29 specimens
Magnoliopsida
Psilatricolporites sp. Pierce 1961
unclassified
Elateroplicites africaensis Herngreen 1973
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]