Ichthyolith

An ichthyolith (from Greek, ἰχθύς “fish“ and λίθος ”stone”, “rock“, literally "fish-rock") is any disarticulated remains of a fish found in the fossil record, most often a scale, denticle or tooth. Ichthyoliths are found in nearly all marine sediment.^[1]

Fossil found in Wyoming.

The term was coined by Doyle, Kennedy and Riedel^[2] (1974) to denote 'fish skeletal debris'.

The term 'stratignathy',^[2] proposed in the same paper for the time relationships of ichthyoliths, did not gain currency.