The cliffs around Puerto Madryn and the Valdés Peninsula expose the Puerto Madryn Formation — a late Miocene shallow-marine unit famous for trophy megalodon teeth, Otodus chubutensis, and abundant marine mammal bone. Access is via guided paleo-tours run from town.
Join a guided paleo-walking tour from Puerto Madryn — guides know the productive cliff bases at Punta Loma and Cerro Avanzado. Surface collecting is regulated; significant finds must be reported.
Drive or taxi from Puerto Madryn (~15 km) to the Punta Loma reserve. Many travelers combine with Valdés Peninsula whale-watching.
Argentina protects vertebrate fossils as scientific patrimony. Significant finds must be reported to the local museum (Museo Paleontológico Egidio Feruglio in Trelew). Use a licensed guide.
Trophy = headline find · Rare = real score · Uncommon = some trips · Common = most trips.
The beachcomber's bonus round — what else the geology gives up.
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