Pellet-Lined Burrow

Crappy Housekeeping
Fossil Type: 
South of Glendive MT
United States
Montana US

These fossilized crustacean burrows are lined with pellets. These pellets can have a fecal origin or can be sand/silt cemented with oral secretions (think spit balls). This practice is used by modern ghost shrimp and other crustaceans when building burrows and in soft sediments. These particular specimens don't appear to be lined with coprolite pellets.