Des boules de bousiers fossiles et leurs terriers dans les sites a Australopitheques du Pliocene tchadien - Archive ouverte HAL Access content directly
Journal Articles Bulletin de la Société Géologique de France Year : 2000

Des boules de bousiers fossiles et leurs terriers dans les sites a Australopitheques du Pliocene tchadien

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Michel Brunet
  • Function : Author
Yves Cambefort
  • Function : Author
Alain Beauvilain
  • Function : Author
Hassane Taisso Mackaye
  • Function : Author
Patrick Vignaud
  • Function : Author
Mathieu Schuster

Abstract

The structures under study belong to the Pliocene continental formation of the palaeo-lake Chad system. This formation is famous for the discovery, in 1995, of the first australopithecine from Chad associated with a rich fauna of mammals, birds, reptiles and fishes. The analysis of this fauna and the interpretation of the depositional environment reveal a landscape of gallery forest, savannah grasslands, and ephemeral rivers interrupted by lacustrine episodes. The sandstone facies contains sandstone balls of 4 to 12 centimetres in diameter, lightly flattened at the poles. These structures are characterized by an external husk or crust and by a centimetric cavity in the upper part of the ball. Between the husk and the cavity, there exists a number of concave laminae, similar to those of a bulb, whose concavity is directed toward the upper cavity. These balls are associated with a vast metre-scale gallery network. This sandstone balls are interpreted as fossil brood-balls of dung beetles (Coleoptera, Scarabaeidae). Comparisons between these structures and the brood-balls of modern Scarabaeidae reveal great similarity, especially in the external husk, the concave internal laminae, and the chamber for the larva in the upper part of the structures.
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Dates and versions

hal-03250783 , version 1 (04-06-2021)

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Philippe Duringer, Michel Brunet, Yves Cambefort, Alain Beauvilain, Hassane Taisso Mackaye, et al.. Des boules de bousiers fossiles et leurs terriers dans les sites a Australopitheques du Pliocene tchadien. Bulletin de la Société Géologique de France, 2000, 171 (2), pp.259-269. ⟨10.2113/171.2.259⟩. ⟨hal-03250783⟩
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