Crayfish gastroliths

@article{Tucker2019CrayfishG,
  title={Crayfish gastroliths},
  author={Ethan A. Tucker and Maurice E. Tucker},
  journal={Geology Today},
  year={2019},
  volume={35}
}
Crayfish produce small button‐like gastroliths in their stomachs. These curious calcitic objects are increasingly common in lakes and streams in the UK and Europe as the invasive American crayfish increase their domination of freshwater environments. These stomach stones are also present in the geological record. 

Crayfish bio-gastroliths from eastern Australia and the middle Cretaceous distribution of Parastacidae

The new specimens indicate that parastacid crayfish were widespread in eastern Australia by middle Cretaceous time, occupying a variety of freshwater ecosystems from the Australian–Antarctic rift valley in the south, to the near-coastal floodplains surrounding the epeiric Eromanga Sea further to the north.

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