'ammonitiferous' originates from the Latin word 'ammonites', referring to the fossilized shells of extinct marine mollusks, combined with the suffix '-ferous', meaning 'bearing' or 'producing'.

'ammonites' transformed into the English word 'ammonitiferous', indicating a geological context where ammonites are found.

Initially, it meant 'bearing ammonites', and this meaning has remained consistent in geological contexts.