Borehole I-MU-I-MA, Sample 26: Early/Lower Albian - Middle Albian, Brazil

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Retitricolpates indet.
10 specimens
Pollen indet.
6 specimens
Dinoflagellates indet.
11 specimens
Acritarchs indet.
1 specimen
Psilatricolpites spp.
1 specimen
Equisetopsida - Araucariaceae
Araucariacites sp. Cookson and Couper 1953
1 specimen
Angiospermae - Austrobaileyales - Trimeniaceae
Cretacaeiporites polygonalis Herngreen 1974
17 specimens
Angiospermae
Monosulcites sp. Cookson and Couper 1953
1 specimen
Coniferales - Podocarpaceae
Callialasporites dampieri (Balme 1957)
1 specimen
original and current combination Zonallapollenites dampieri
unclassified
Verrutriletes spp.
1 specimen
Lycopodiopsida - Selaginellales - Selaginellaceae
Perotrilites pannuceus Brenner 1963
2 specimens
Lycopsida
Uvaesporites sp. Döring 1965
1 specimen
Polypodiopsida - Schizaeales - Schizaeaceae
Cicatricosisporites sp. Potonie and Gelletich 1933
1 specimen
Cycadopsida - Gnetales
Elaterosporites protensus Jardiné 1967
1 specimen
Ginkgoopsida - Ephedrales
Ephedripites barghoorniistaplinii
2 specimens
Ephedripites informal sp. 9 Bolkhovitina and Potonié 1958
3 specimens
Ephedripites irregularis Herngreen 1973
1 specimen
unclassified
Foraminifera indet. Eichwald 1830
2 specimens
Reyrea polymorphys
see common names

Geography
Country:Brazil State/province:Maranhao
Coordinates: 2.6° South, 42.8° West (view map)
Paleocoordinates:7.1° South, 13.7° West
Basis of coordinate:stated in text
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Albian 10 m.y. bin:Cretaceous 4
Key time interval:Early/Lower Albian - Middle Albian Pollen zone: Zone I, Reyrea polymorphus
Age range of interval:113.00000 - 106.20000 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:144237
Authorizer:C. Jaramillo Enterer:G. Doria
Research group:paleobotany
Created:2013-05-02 10:34:19 Last modified:2013-05-01 19:34:19
Access level:the public Released:2013-05-02 10:34:19
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]