A simulated bird gastric mill and its implications for fossil gastrolith authenticity
A rock tumbler, stones, water, plant material, hydrochloric acid, and pepsin were used to simulate a bird gizzard in order to study abrasion rate and influence of stomach juices and foodstuff on gastrolith surface development.The experiment lasted for six months.Each week, the "stomach" was supplied with fresh grass and stomach juices.Aft