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2 Bulletin of the Polish Academy of Sciences. Earth Sciences

2 Pszczółkowski A.

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The Margot Formation in Western Cuba: a Volcanic and Sedimentary Sequence of (Mainly) Cenomanian-Turonian Age

Pszczółkowski A.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2002

Vol. 50, nr 2

193-205

The stratotype of the Margot Formation was previously established at the Mina Margot in the Matanzas Province of western Cuba. The limestone interbeds occurring between the basalts of the upper part of this formation contain Turonian planktonic foraminifers. Late Cretaceous age and tectonic position of the Margot Formation in the Palaeogene thrust nappes exposed in the northwestern Matanzas Province suggest the Caribbean plateau origin of the basalts occurring in this unit. According to an alternative interpretation, the Margot Formation represents a fragment of the section of the proto-Caribbean Oceanic crust, mainly of Cenomanian-Turonian age.

New data on Late Albian and Late Cenomanian Nannoconid Assemblages from Cuba

Pszczółkowski A.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2000

Vol. 48, nr 2

135-149

The nannoconid assemblage found in a Late Albian limestone layer of the Santa Teresa Formation in western Cuba contains both the taxa known to occur in the Albian (Nannoconus truitti truitti, N. cf. elongatus and N. cf. regularis), and also those usually not reported from the post-Aptian strata (N steinmannii steinmannii, N. cf. colomii, N. gr. colomii-steinmannii). Planktonic foraminifers occurring in this layer are Late Albian in age. The narrow-canal taxa of the genus Nannoconus Kamptner, 1931, are interpreted as the in situ components of the described Late Albian nannofossil assemblage. Presence of scarce nannoconids, identified as N. truittii truittii, N. regularis and N. cf. regularis, in samples of Late Cenomanian limestones exposed in western and central Cuba, is also recorded.