Nannoconid assemblages in Upper Hauterivian-Lower Aptian limestones of Cuba: their correlation with ammonites and some planktonic foraminifers

• Autorzy: Pszczółkowski A. , Myczyński R.
• Języki publikacji: EN

Abstrakty

EN

The nannoconids are abundant in the Lower Cretaceous pelagic limestones in western and central Cuba. In some limestone beds, these nannofossils occur together with ammonites or planktonic foraminifers. Our samples were collected from the Polier, Veloz and Paraiso formations. The Late Hauterivian to Early Aptian age of the studied samples is based mainly on ammonites. The nannoconids identified in these samples are grouped in 4 assemblages: Late Hauterivian, Early Barremian, Late Barremian and late Early Aptian. In the Early Barremian assemblage, the narrow- canal nannoconids are by far more frequent than the wide-canal ones. Small specimens, classified herein provisionally as N. truittii truittii, occur also in this assemblage. On the other hand, the representatives of the Nannoconus steinmannii group are absent in the late Early Aptian assemblage, which includes the wide canal forms only. Nannoconids found in one sample may represent an assemblage of the earliest Aptian age.

Słowa kluczowe

EN

Cuba; ammonites

• Wydawca: Instytut Nauk Geologicznych PAN
• Czasopismo: Studia Geologica Polonica
• Rocznik: 1999
• Tom: Vol. 114
• Strony: 35--75

Twórcy

autor

Pszczółkowski A.

autor

Myczyński R.

• Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warszawa, Poland,