New Tithonian-Berriasian morphospecies of the genus Stomiosphaera Wanner (calcareous dinoflagellate cysts) from the Vaca Muerta Formation, Neuquen Basin, Argentina

被引：0
|
作者：
Kietzmann, Diego A. [1 ,2 ]
机构：
[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ciencias Geol UBA FCEN, Pabellon 2,Intendente Guiraldes 2160,C1428EHA, Buenos Aires, DF, Argentina
[2] Consejo Nacl Invest Cient & Tecn CONICET, Inst Geociencias Bas Ambientales & Aplicadas Bueno, Pabellon 2,Intendente Guiraldes 2160,C1428EHA, Buenos Aires, DF, Argentina
来源：
CRETACEOUS RESEARCH | 2024年 / 155卷
关键词：
Calcareous dinofagellate cysts; Vaca Muerta Formation; Upper Jurassic; Lower Cretaceous; MAGNETOSTRATIGRAPHY; BOUNDARY; AMMONITE;
D O I：
10.1016/j.cretres.2023.105786
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Five new morphospecies of calcareous dinoflagellate cysts belonging to the genus Stomiosphaera Wanner, are described from the Tithonian-Berriasian Vaca Muerta Formation, in the Neuquen Basin, Western Argentina: Stomiosphaera triangulata sp. nov., Stomiosphaera quadrata sp. nov., Stomiosphaera subechinata sp. nov., Stomiosphaera subspinosa sp. nov., and Stomiosphaera gracilis sp. nov. Their stratigraphic distribution is discussed, particularly that of Stomiosphaera subechinata sp. nov. (Tithonian - lower Berriasian), which was previously assigned to Stomiosphaera echinata Nowak, a species that in the Tethys domain appears for the first time in the upper Valanginian. Likewise, possible assignments to the genera defined from three-dimensional observations are proposed, and eutrophic neritic conditions are interpreted for the time in which these species appear in the Neuquen Basin. (c) 2023 Elsevier Ltd. All rights reserved.
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