First Report of Redeposited Cretaceous Radiolarians in the Eocene Sand-Shale Member of Zhepure Formation, T&amp;#252;na, Yadong, Tibet

Xinfa Li,Guobiao Li

doi:10.4236/ojg.2019.910043

Abstract

Cretaceous radiolarians were firstly reported from the Eocene Sand-Shale Member of Zhepure Formation in the Gulupu section, Tuna, Yadong, Tibet. In spite of poor preservation, 24 species of 14 radiolarian genera have still been identified, clearly indicating an age, ranging from early Aptian–Maastrichtian, and therefore should have occurred in the Eocene as a result of redeposition. The study of the stratigraphic origin of these radiolarians will shed light on the paleoenvironment and late evolutionary history of the Tibet-Tethys.

Highlights

Early Aptian; P. nuda (Schaaf), early Aptian; P. pachicostata (Wu and Li), Turonian; Dictyomitra communis (Squinabol), late Aptian; middle Albian; D. multicostata Zittel, early Turonian; Lithostrobus litus Forman, late Cretaceous; Thanarla conica (Squinabol), Middle Albian; T. veneta (Squinabol), late Albian to Turonian; Amphipyndax stockii (Campbell and Clark), Campanian; Distylocapsa veneta (Squinabol), late Albian to middle Cenomanian and Praeconocaryomma californiaensis Pessagno, Coniacian-Santonian
Cretaceous radiolarians were firstly reported from the Eocene Sand-Shale Member of Zhepure Formation in the Gulupu section, Tüna, Yadong, Tibet
A certain number of radiolarians were obtained in the Eocene strata of Gulupu section, based on the previous studies on Cretaceous radiolarians in Tibet [1] [2] [3] [4], and other areas [5] [6], 24 species of 14 genera were identified, which provides an age of middle to late Cretaceous

Summary

Introduction

Early Aptian; P. nuda (Schaaf), early Aptian; P. pachicostata (Wu and Li), Turonian; Dictyomitra communis (Squinabol), late Aptian; middle Albian; D. multicostata Zittel, early Turonian; Lithostrobus litus Forman, late Cretaceous; Thanarla conica (Squinabol), Middle Albian; T. veneta (Squinabol), late Albian to Turonian; Amphipyndax stockii (Campbell and Clark), Campanian; Distylocapsa veneta (Squinabol), late Albian to middle Cenomanian and Praeconocaryomma californiaensis Pessagno, Coniacian-Santonian. Cretaceous radiolarians were firstly reported from the Eocene Sand-Shale Member of Zhepure Formation, Tüna, Yadong, Tibet.

Results

Conclusion