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STUDIA GEOLOGIA - Issue no. 2 / 2010 | |||||||
Article: |
LATE JURASSIC–EARLY CRETACEOUS FORAMINIFERA FROM ŠTRAMBERK-TYPE LIMESTONES, POLISH OUTER CARPATHIANS. Authors: . |
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Abstract: Foraminifera
studies were carried out on the Štramberk-type limestones which occur as
pebbles to small boulders (exotics) within the uppermost Jurassic-Palaeogene
flysch deposits of the Polish Outer Carpathians. The studies were focused on foraminifera
from (1) reef and peri-reef facies, and (2) lagoonal algal-foraminiferal
facies. The paper deals with 34 species (including 8 in open nomenclature)
representing 30 genera, 22 families, 14 superfamilies, 11 suborders, and 7
orders. A more precise age determination has been obtained for 30 exotics, representing
a Tithonian (mostly) to Valanginian age. Foraminiferal assemblages from at
least two exotics suggest a Valanginian age as indicated by the co-occurrence
of the species: Meandrospira favrei (CHAROLLAIS,
BRÖNNIMANN & ZANINETTI), Montsalevia
salevensis (CHAROLLAIS, BRÖNNIMANN &
ZANINETTI), Patellina turriculata DIENI
& MASSARI, Neotrocholina valdensis REICHEL,
Hechtina praeantiqua BARTENSTEIN
& BRAND, Istriloculina eliptica (IOVCHEVA)
and I. emiliae NEAGU.
Previous studies based on ammonites and calpionellids indicated the Tithonian
to the Early Berriasian age of the Štramberk Limestone in Moravia (the Czech
Republic), and their equivalents in Poland. However, Valanginian shallow-water
limestones occur as pebbles in some deposits of the Outer Carpathians in the
Czech Republic. Further evidence for Valanginian shallow-water marine carbonate
sedimentation (algal facies) in the Polish part of the Tethyan margin comes
from recent studies of the substrate drilled in the Carpathian Foredeep. |
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