Image: Cross sections of African elephant and woolly mammoth tusks

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Description: Cross sections of the tusk samples with positions of samples for XRD and positions of measurement (red dots) marked. (a,b) Loxodonta africana. Note the annual growth rings and the >90° angle of the Schreger pattern. (c,d) Mammuthus primigenius. Note the annual growth rings and the <90° angle of the Schreger pattern (Photographs S. Döring, Senckenberg Research Institute, Research Station of Quaternary Palaeontology Weimar).
Title: Cross sections of African elephant and woolly mammoth tusks
Credit: https://www.nature.com/articles/s41598-019-38779-1?f
Author: Sebastian J. Pfeifer, Wolfram L. Hartramph, Ralf-Dietrich Kahlke & Frank A. Müller
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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Woolly mammoth

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