Taphonomy of carbonate concretions with irregular echinoids from the Lower Cretaceous Agrio Formation, Neuquén Basin, west-central Argentina.

LEHMANN, O.E.R.; LAZO, D.G.; M.B. AGUIRRE-URRETA

Congreso; 4 International Palaeontological Congress; 2014

Echinoid-dominated assemblages are valuable taphonomic and palaeoecological tools and very useful to determine environmental parameters such as rate of sedimentation, water energy and substrate consistency. Despite this fact, they are rather poorly known from the Lower Cretaceous worldwide, particularly from South America. In this work, a total of four complete ellipsoidal carbonate concretions and 11 loose fragments, hosting mass accumulations of small irregular echinoids, were studied.