ASGP (2005), vol. 75: 1-16
CALPIONELLID AND NANNOCONID STRATIGRAPHY AND MICROFACIES OF LIMESTONES AT THE TITHONIAN–BERRIASIAN BOUNDARY IN THE SIERRA DEL INFIERNO (WESTERN CUBA)
Andrzej PSZCZÓŁKOWSKI (1), Dora GARCÍA DELGADO (2) & Santa GIL GONZÁLEZ (3)
1) Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, PL-00-818 Warszawa, Poland,
apszczol at twarda.pan.pl
2) Instituto de Geología y Paleontología, Vía Blanca y Prolongación de Calzada de Güines, S/N, San Miguel del Padrón, Ciudad de la Habana, Codigo Postal 11000, La Habana, Cuba, dora at igp.minbas.cu
3) Centro de Investigaciones del Petróleo, Washington 169, Cerro, Habana 12000, Cuba, santa at ceinpet.cupet.cu
Pszczółkowski, A., García Delgado, D. & Gil González, S., 2005. Calpionellid and nannoconid stratigraphy and microfacies at the Tithonian–Berriasian boundary in the Sierra del Infierno (western Cuba). Annales Societatis Geologorum Poloniae, 75: 1–16.
Abstract: The radiolarian and calpionellid microfacies are characteristic for the latest Tithonian–Early Berriasian limestones of the Guasasa Formation in the Sierra del Infierno, western Cuba. The limestones of the uppermost part of the El Americano Member belong to the Late Tithonian Crassicollaria intermedia Subzone, Crassicollaria Standard Zone, and to the basal part of the Early Berriasian Calpionella alpina Subzone. The lower part of the Tumbadero Member is assigned to the C. alpina Subzone of the Calpionella Standard Zone. A heteromorph ammonite assemblage (Protancyloceras-Vinalesites) crosses the Crassicollaria/Calpionella Zones boundary. The studied limestones belong to three nannoconid assemblages of latest Tithonian–Early Berriasian age assigned to Nannoconus wintereri Subzone, N. steinmannii minor Subzone and N. steinmannii steinmannii Zone. Radiolarian taxa identified in thin sections are consistent with the lower part of D2 radiolarian zone from Western Tethys. The investigated deposits have been probably accumulated in the dysaerobic zone. At the Tithonian–Berriasian (J/K) boundary, dysaerobic to anaerobic conditions could be widespread in the deeper waters of the northwestern Proto-Caribbean basin.
