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Ecostratigraphic study of Paleocene and early Eocene palynological cyclicity in northern South America

Valenti Rull
Ecostratigraphic study of Paleocene and early Eocene palynological cyclicity in northern South America
Palaios (February 2000) 15 (1): 14-24

Abstract

A quantitative palynological study of the Paleocene/Eocene transition in western Venezuela was undertaken to detect and analyze possible cyclic patterns. Two different methodologies were used, palynocycles and ecologs, and their results are compared. A total of 237 outcrop samples from three formations deposited in continental to coastal environments were analyzed for pollen and fern spores. Several palynological cycles are recorded and correlated with third-order global eustatic cycles. A high-frequency cyclicity of ca. 220,000-year period also was found. Both methodologies recorded the same cyclic patterns and can be considered complementary. Ecologs are easier to use, but have less interpretative potential. Palynocycles are more complex, but also more descriptive and help detect small hiatuses. Diversity values reach maxima at cycle boundaries and their minima in the middle of cycles. This distribution has been interpreted in terms of different palynomorph sources under conditions of high and low sea level. During the Paleocene/Eocene transition, diversity shows a constant ascending trend, probably due to a long-term, worldwide climatic warming.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 15
Serial Issue: 1
Title: Ecostratigraphic study of Paleocene and early Eocene palynological cyclicity in northern South America
Author(s): Rull, Valenti
Affiliation: PDVSA Exploration & Production, Caracas, Venezuela
Pages: 14-24
Published: 200002
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 30
Accession Number: 2000-051373
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200017
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