Burrow fossils

Treptichnus is a genus of trace fossils (with modern analogues) representing a three-dimensional burrow. These fossil traces are known from marine, brackish, and freshwater deposits from the Ediacaran (550 million years ago) to the Upper Oligocene (24 mya).

Paleodictyon is a trace fossil, usually interpreted to be a burrow, which appears in the geologic marine record beginning in the Precambrian/Early Cambrian and in modern ocean environments. Paleodictyon were first described by Giuseppe Meneghini in 1850. The origin of the trace fossil is enigmatic and numerous candidates have been proposed.

A paleoburrow is an underground shelter excavated by extinct paleo-vertebrate megafauna that lived in the prehistoric era. Most paleoburrows are likely made by giant armadillos, pampatheres, and/or large ground sloths, depending on their size.'''''' Thousands of examples have been identified across South America, mostly in the Brazilian states of Santa Catarina and Rio Grande do Sul.