Borehole I-MU-I-MA, Sample 11 (Cretaceous to of Brazil)

Also known as Mandacaru borehole

Where: Maranhao, Brazil (2.6° S, 42.8° W: paleocoordinates 9.7° S, 17.1° W)

• coordinate stated in text

When: Zone II, Reyrea polymorphus pollen zone, Late/Upper Albian to Late/Upper Albian (105.3 - 93.5 Ma)

• 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).

Environment/lithology: terrestrial; lithified, argillaceous shale and lithified, argillaceous sandstone

• The lithology of the lower ca. 825 metres consists mainly of shales alternating with some sandstones.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: chemical, hydrochloric, hydroflouric, sieve

Primary reference: 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. Cardenas ]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 144224: authorized by Carlos Jaramillo, entered by Gabriela Doria on 02.05.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
 Foraminifera -
Retitricolpites
  -
Psilatricolpites
  -
Psilatricolpites spp. Van der Hammen and Wijmstra 1964
Pinopsida
 Pinales - Cheirolepidiaceae
Ginkgoopsida
 Ephedrales - Ephedraceae
Cycadopsida
 Gnetales -
Steevesipollenites binodosus Stover 1964 cycads
Elaterosporites klaszi Jardiné 1967 elaterate
Magnoliopsida
 Magnoliales - Trimeniaceae
 Gymnospermophyta -