Santa Cruz Formation, Geological formation in southern Patagonia, Argentina and Chile
The Santa Cruz Formation is a geological sequence in southern Patagonia containing layers of sandstone and mudstone packed with fossil remains. These sediment deposits reveal what the landscape and animal life were like during the late Early Miocene.
The formation developed during the late Early Miocene, a time when South America was home to mammals that are now extinct. These deposits preserve an extensive record of that vanished animal world.
Scientists and researchers from multiple countries collaborate at this site to study the preserved remains of ancient species and geological processes.
The richest study areas are spread across remote sections, so proper planning and local guidance make visits more rewarding. Visitors should expect variable weather and uneven terrain.
The formation contains two distinct layers: the fossil-rich Estancia La Costa Member and the predominantly mudrock Estancia La Angelina Member.
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