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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Planktonic Foraminifera and Calcareous Nannoplankton Data Used to Define
the Regional Geologic Framework of the Neogene in the Southern Laguna Madre-Tuxpan
Continental Shelf, Eastern Mexico
Guevara, E. H.,1 Ruiz-Ruiz,
H. F.,2 Ambrose, W. A.,1 Martinez-Garcia, J.,2 Wawrzyniec,
T. F.,3 Rico-Perez, J.,4 Dunlap, D. B.,1 Fouad,
K.,1 and Aranda-Garcia, M.2
ABSTRACT
Biostratigraphic information helped define the geological
setting of the Miocene in the Eastern Mexico continental shelf and upper
slope between the Veracruz and Burgos Basins. This study forms part of a
joint Bureau of Economic Geology-Pemex Exploracion y Produccion investigation
of Neogene hydrocarbon plays in Tertiary coastal basins of eastern and southeastern
Mexico.
Planktonic foraminifera and calcareous nannoplankton
data define the chronostratigraphy of intervals examined in the study area.
These intervals, each comprising more than one third-order stratigraphic
sequence, are bounded by sequence boundaries (unconformities) and maxi-mum
flooding surfaces correlated and delineated by integrated biostratigraphic,
seismic, and well-data analysis.
Ages were assigned on the basis of interpreted
species extinction (downhole first appearance) and/or planktonic foraminifera
and calcareous nannoplankton biozone tops. The microfossils used for Pliocene
age determinations were Discoaster brouweri, Discoaster pentaradiatus,
Reticulofenestra pseudoumbilica, Sphenolithus abies, Globigerinoides obliquus
extremus, and Globorotalia margaritae margaritae. Similarly, Sphaeroidinellopsis
disjuncta, Globorotaloides variabilis, Discoaster quinqueramus, Triquetrorhabdulus
rugosus, and Discoaster berggrenii were used to define the late
Miocene. The middle Miocene was defined by Globorotalia mayeri, Globorotalia
fohsi s.l., and Discoaster hamatus, and the early Miocene by Globigerinoides
bisphericus, Catapsydrax dissimilis, and Sphenolithus dissimilis.
Comparison and integration of the results of
this study with those of other coastal basins in eastern and southeastern
Mexico, and in the adjacent Texas coastal plain and offshore areas, should
result in unified biostratigraphic criteria for future age determinations
of Neogene intervals in the southwestern Gulf of Mexico.
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