Abstract
Two new dasycladalean species from the Upper Cretaceous of the Mountain Pastrik, Kukes Cretaceous Unit of the Mirdita Zone are described: Trinocladus divnae sp. nov. is characterized by variable size of the thallus, relatively narrow main axis, typical Trinocladus organization of the laterals and thin calcification limited to the distal part of the thallus which includes a swollen part of secondaries and short tertiaries. Often, the internal portion of the whorls (except sometimes the main stem membrane), tends to dissolve and form dissolution cavities filled with cement. Montiella filipovici sp. nov. is characterized by a primary skeleton made of a thin individual sheath around a fertile ampullae, often obliterated by recrystallization. Four to six laterals, each giving one secondary and one fertile ampulla located on the upper side of the relatively thick short primary lateral. Upper Cenomanian limestone with Cisalveolina fraasi and Trinocladus divnae sp. nov. was deposited immediately before the events that resulted in sea level rising. The middle and upper Cenomanian eustatic-tectonic processes had different effects in the Pastrik shallow water areas, depending on the distance from the basinal part of the Unit. Bathymetric changes in a part of the Pastrik sedimentary area were not significant, even negligible. Montiella filipovici is found in the post-fraasi shallow water sequence, assigned to the ?uppermost Cenomanian-lowermost Turonian (= Whiteinella archaeocretacea Zone p. p.; a short stratigraphic gap, in a part of the area, is noted). Shallow water limestone with Turonian taxa, corresponding to the helvetca Zone, occurs a few meters upward. Supplementary note: the species Cylindroporella parva RADOICIC is transferred in the genus Montiella, the species Permocalculus elliotti JOHNSON is transferred in the genus Trinocladus, while the species Trinocladus bellus YU JING is transferred in the genus Belzungia.
Highlights
The Cretaceous succession of the Mountain Pa{trik is an attached platform overlaying the Diabase Chert Formation, serpentinite and Tithonian–Berriasian carbonate clastics in the north
The present note is a further contribution to the Dasycladales in Pa{trik limestone: two new species – Trinocladus divnae and Montiella filipovici are described
Specimens with a thin distal calcification are ascribed to Trinocladus divnae because of the somewhat larger size of the thallus and, especially, the difference in the preservation are not of specific maximal values
Summary
The Cretaceous succession of the Mountain Pa{trik is an attached platform (superimposed paleogeography) overlaying the Diabase Chert Formation, serpentinite and Tithonian–Berriasian carbonate clastics (flysch auct.) in the north. The present note is a further contribution to the Dasycladales in Pa{trik limestone: two new species – Trinocladus divnae and Montiella filipovici are described. Trinocladus divnae and Montiella filipovici – a new species (Dasycladales, green algae) from the Upper Cretaceous 67 for her contribution to the study of depositional environments of the Late Paleozoic in northwestern Serbia.
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