Lizard eggs from Upper Cretaceous Lameta Formation of Jabalpur, central India, with interpretation of depositional environments of the nest-bearing horizon

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• 作者：U.K. Shukla ; Rahul Srivastava
• 关键词：Lacertilian nest ; Lagoonal sediments ; Lower Limestone ; Upper Cretaceous ; Lameta type section ; Jabalpur ; India
• 刊名：Cretaceous Research
• 出版年：2008
• 出版时间：August 2008
• 年：2008
• 卷：29
• 期：4
• 页码：674-686
• 全文大小：3379 K

文摘

A nest with eleven relatively large-sized eggs of lacertilian affinity has been recovered from the Lower Limestone horizon exposed at the type section of the Lameta Formation, Jabalpur (Madhya Pradesh, India). Morpho-structurally, the eggs probably represent a new family as they share common features with the eggs of the living varanid lizard Varanus indicus and a shell microstructure described for geckonids. The close association of a lizard nest and titanosaurid (Sauropoda) eggs raises interesting questions regarding the egg-laying strategies of these differently-sized reptiles.

Sedimentological data suggest that the Lower Limestone of Lameta Ghat was deposited in an alkaline lagoon that was connected to a marine embayment by channels. The massive limestone, sandy limestone, and calcareous sandstone lithofacies forming coarsening upward sequence represents sedimentation from deeper to marginal parts of the lagoon that were densely vegetated. Pre-burial meteoric diagenesis of the sediments indicates humid climate. Such conditions might have provided a suitable habitat supporting a large variety of terrestrial life.