Open AccessDinoflagellate cyst stratigraphy of the Lower Cretaceous Jydegard Formation, Bornholm, Denmark
Author(s) -
Stefan Piasecki
Publication year - 1984
Publication title -
bulletin of the geological society of denmark
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.674
H-Index - 28
eISSN - 2245-7070
pISSN - 0011-6297
DOI - 10.37570/bgsd-1983-32-11
Subject(s) - dinoflagellate , cretaceous , geology , paleontology , ostracod , ecological succession , genus , borehole , cyst , biology , oceanography , zoology , botany , medicine , radiology
Two Danish Geological Survey boreholes in the Lower Cretaceous fine-grained R0dbjerg Member (Jydegard Formation) in the Nyker fault-block on Bornholm have yielded dinoflagellate cysts which can date the sequence as latest Ryazanian to earliest Valanginian. Two dinoflagellate zones are identified, a lower Gochteodinium villosa Zone and an upper Pseudoceratium pelliferum Zone. The age assignment is in agreement with previous ostracod datings. One new dinoflagellate cyst species, Mendicodinium rugarum, is erected and one monospecific genus and the species is emended, Lagenorhytis- L. delicatula. The morphology and distribution of Sentusidinium pelionense, Cantulodinium speciosum and aff. Chlamydophorella nyei are discussed.