For today's #fossilfriday , here's a trace fossil, Ophiomorpha! These are the traces of burrows originally made by crustaceans. The nodules on the outside are the fossilized remains of the crustacean's faeces, which are used to strengthen the side of the burrow. This behaviour can also be seen in modern-day ghost shrimp.

These were found near the boundary of the Bearpaw / Horseshoe Canyon formations.

#palaeontology #paleontology #drumheller #alberta #ab #ophiomorpha #tracefossils