The late Barremian Halimedides horizon of the Dolomites (Southern Alps, Italy)

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• 作者：Alexander Lukeneder^a ; ^{alexander.lukeneder@nhm-wien.ac.at} ; Alfred Uchman^b ; ^{alfred.uchman@uj.edu.pl} ; Christian Gaillard^c ; ^{christian.gaillard@univ-lyon1.fr} ; Davide Olivero^c ; ^{davide.olivero@univ-lyon1.fr}
• 关键词：Halimedides horizon ; Sedimentation discontinuity ; Late Barremian hiatus ; Lower Cretaceous ; Dolomites ; Italy
• 刊名：Cretaceous Research
• 出版年：2012
• 期刊代码：114_01956671
• 类别：abs
• 出版时间：June, 2012
• 卷：35
• 期：Complete
• 页码：199-207
• 文件大小：2952 K

摘要

A new trace fossil marker level, the Halimedides horizon, is proposed for the Lower Cretaceous pelagic to hemipelagic succession of the Puez area (Southern Alps, Italy). The horizon occurs in the middle part of the late Barremian Gerhardtia sartousiana Zone (Gerhardtia sartousiana Subzone). It is approximately 20聽cm thick and restricted to the uppermost part of the Puez Limestone Member (marly limestones; Hauterivian-Barremian; Puez Formation). It is fixed to the top 20聽cm of bed P1/204. The grey-whitish limestone bed of the G.聽sartousiana Zone is penetrated by Aptian red marls-siltstones of the Redbed Member. The horizon is documented for the first time from the Southern Alps, including the Dolomites, and can be correlated with other Mediterranean localities. The trace fossil assemblage of this marker bed with the co-occurrence of Halimedides, Spongeliomorpha and Zoophycos sheds light on the Lower Cretaceous sedimentological history and current system of the Puez area within the Dolomites. It also highlights the palaeoenvironmental evolution of basins and plateaus and provides insights into the late Barremian interval.