Evolution of Mg contents in the dentine in ever growing mammal teeth in various steps of the formation of fossil assemblages

Dentine of ever-growing mammal teeth contains high Mg level (> 1 %). Rodent incisors are such ever-growing teeth. The evolution of Mg contents in dentine of various ever-growing teeth has been studied on three main steps of fossil assemblage formation: fresh teeth, teeth from seat (regurgitation pellets or faeces), and fossil teeth. Various predators and sites have been studied. In Recent teeth, Mg contents are affected by digestive processes. Each predator seems to have a peculiar effect on the Mg content alteration, and there is a strong depletion in all the fossil teeth. Identification of predator from Mg contents probably will be possible in the near future.