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Robert DePalma

A cross-section of the Tanis deposit shows the layered stratigraphy from two surge pulses and some animal fossils.

Study leader Robert DePalma conducts field research at the Tanis site.

Study leader Robert DePalma (right) and field assistant Kylie Ruble stabilize a fossil slab with plaster bandages before removing it from the ground.

The Tanis deposits contain a well-preserved mass of inter-tangled fish that retain their three-dimensional forms.

Study coauthor Mark Richards (left, background) watches as team leader Robert DePalma examines impact ejecta under a microscope during an expedition at Tanis.