I have trouble finding one lone whole trilobite when I go out collecting in the Devonian of New York.   And then along comes this note from central Poland where researcher Blazej Blazejowski reports that the eyeless trilobite Trimerocephalus chopini can be found preserved in trains with head to tail (or in trilobite lingo with cephalon to pygidium).  He infers that the queues actually represent migratory chains as the ancient arthropods marched across the seafloor, perhaps in an unsuccessful effort to escape near and present danger.

Wouldn’t it be neat to find a queue of arthropods after splitting some Hamilton Group shales?  Or maybe there was no reason for New York trilobites to migrate?  Perhaps life was just too good to move?

Blazejowski, B., et. al., 2016 Ancient animal migration:  a case study of eyeless dimorphic Devonian trilobites from Poland, Palaeontology, V. 59, p. 743-751.