A new paper not yet mentioned to my knowledge.
R. Feng, J.M. Maley, G. Schatte, R.E. Hoffmeyer, K.S. Brink, T. Ellis, D. Brinkman, and R. Sammynaiken (in press)
Chemical and structural information from the enamel of a Troodon
tooth leading to an understanding of diet and environmentApplied Spectroscopy
Synchrotron micro X-ray fluorescence (XRF) spectroscopy with two-dimensional element mapping, micro X-ray diffraction (XRD), electron spin resonance spectroscopy (ESR) and atomic force microscopy (AFM) were used to investigate the chemical and structural nature of the enamel of a tooth from Troodon
, a small theropod dinosaur. These methods show that the crystallites in the Troodon
tooth are submicron-sized carbonated calcium hydroxyapatite, which are semi-randomly oriented with a preferred orientation of (002) towards the surface of the tooth. Transition metal ions are distributed in the voids between crystallite clusters. Comparison of the ESR spectra indicates that the Troodon
tooth had less exposure to UV than a fossilized crocodile tooth.