Colombian late cretaceous tropical planktonic foraminifera: Redressing the imbalance

Conference · Mon Feb 01 04:00:00 EST 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6064022

McCarthy, L D

Recent work involving Late Cretaceous planktonic foraminifera has concentrated on European and other areas in the Northern Hemisphere. Many of the biostratigraphical and evolutionary models reflect this geographical restriction and ignore earlier studies from tropical areas. In 1955 Rolando Gandolfi described many new species and subspecies from Colombia and provided a different view of the evolutionary development of planktonic foraminifera. A re-examination of the Gandolfi type collection using Scanning Electron Micrography (Environmental Chamber technique) integrated with Colombian well samples from onshore Guajira area, Middle and Upper Magdalena Valley and Putumayo Basin has given a new view into the evolutionary development of Late Cretaceous planktonic foraminifera. This has enabled a modified globigerine Late Cretaceous biostratigraphy to be constructed for Colombia. This work redresses the imbalance between studies of tropical and northern high latitude Late Cretaceous planktonic foraminifera and provides an insight into the paleoenvironmental and paleoclimatological factors influencing the Colombian region at the time.

• OSTI ID: 6064022
• Report Number(s): CONF-930306--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 77:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
ANIMALS
AQUATIC ORGANISMS
COLOMBIA
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
EARTH PLANET
FORAMINIFERA
FOSSILS
GEOLOGIC AGES
GEOLOGY
INVERTEBRATES
LATIN AMERICA
MESOZOIC ERA
MICROORGANISMS
NORTHERN HEMISPHERE
ORIGIN
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANETS
PLANKTON
PROTOZOA
SARCODINA
SOUTH AMERICA
STRATIGRAPHY