ASGP (2011), vol. 81: 199–205

MORPHOTYPE VARIATION OF ORTHOPHRAGMINIDS AS A PALAEOECOLOGICAL INDICATOR: A CASE STUDY OF BARTONIAN LIMESTONES, POD CAPKAMI QUARRY, TATRA MTS, POLAND

Elżbieta MACHANIEC, Renata JACH & Michał GRADZIŃSKI
Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków, Poland, e-mails: elzbieta.machaniec at uj.edu.pl; renata.jach at uj.edu.pl; michal.gradzinski at uj.edu.pl

Machaniec, E., Jach, R. & Gradziński, M., 2011. Morphotype variation of orthophragminids as a palaeoecological indicator: A case study of Bartonian limestones, Pod Capkami Quarry, Tatra Mts, Poland. Annales Societatis Geologorum Poloniae, 81: 199–205.

Abstract: Nummulites-Discocyclina bioclastic packstone and Discocyclina rudstone occur in the transgressive sequence of the Middle–Upper Eocene deposits in the Tatra Mts. The succession of the studied facies is a direct response to a rapid environmental change, related to progressive deepening. Facies transition from Nummulites- Discocyclina bioclastic packstone of proximal mid-ramp to Discocylina rudstone of distal mid- and outer-ramp is an exemplary record of a deposition during deepening conditions. Increasing of diversity of the genus Discocyclina, decreasing of diversity of other foraminifera up the section and vertical variation of orthophragminid mor- photypes from the ovate- through saddle- to the disc-shaped tests are related to deepening and shadowing of the depositional environment.