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Abstract
Chapter from:
AAPG Memoir 68:Regional and Petroleum Geology of the Black Sea and
Surrounding Region, Edited by A.G. Robinson
AAPG Memoir 68: Regional and Petroleum Geology of the Black Sea and
Surrounding Region. Chapter 10: Upper Jurassic-Cretaceous Planktonic Biofacies Succession and the Evolution of the Western
Black Sea Basin , by
Marius Dan Georgescu,
Pages 169-182
Copyright © 1997 by The American Association of Petroleum Geologists. All rights
reserved.
Chapter 10
Upper Jurassic-Cretaceous Planktonic Biofacies Succession and the
Evolution of the Western Black Sea Basin
Marius Dan Georgescu
PETROMAR
Constanta, Romania
ABSTRACT
Three planktonic biofacies successions are recognized in the
Upper Jurassic and Cretaceous in the Western Black Sea, offshore Romania. Biofacies A
(Oxfordian-Valanginian) contains rare Globuligerina tests in punctual
occurrences. The planktonic foraminifera are recorded in carbonate inner-shelf deposits in
the Upper Jurassic, and mixed (detrital, clayey, marly) shelf deposits in the
Berriasian-Valanginian. The first records of the Western Black Sea opening are dated as
Valanginian. Biofacies B largely corresponds to the turbiditic interval of the late
Albian-Cenomanian. The planktonic foraminiferal assemblages consist of both primitive
(globular chambered) and morphologically advanced taxa (keeled Rotalipora and Praeglobotruncana).
The planktonic record is discontinuous, but some claystone levels accumulated under calmer
water environments (very low terrigenous input) show remarkable consistency. Biofacies C
is peculiar to the outer-shelf deposits of Cenomanian through Maastrichtian age. A gradual
increase of the recorded taxa and group diversity is evident. Planktonics are ubiquitous.
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