Abstract
Outcrops of the San Isidro Formation (32 m) in west Mendoza province, consist of monotonous, nearly homogeneous-sequences of dark-gray to dark brown, thin-bedded limestones with shales, siltstones and interbedded medium to fine grained sandstones. This area is known for its fossiliferous localities of Middle Cambrian trilobites. Fossils include trilobites, particularly planktonic agnostids, sponge spicules, foraminifera and calcispheres. Both fossils and sedimentologic characteristics indicate relatively deep-water marine sedimentation.
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