Hey guys, since we were on the topic of mammoth/mastodo ivory in the I.D forum, I was wondering if we could quickly talk about Schreger lines. I have found several small ivory fragments with Schreger lines and was looking through articles the other day about them and ID'ing ivory. I saw a picture of a cross section of sperm whale ivory and noticed some lines. I wanted to know are these Schreger as well or are they limited to only those in the Proboscidea order. Below is the picture, a picture of my best ivory chunk, and a link to the website I was looking at.
https://www.fws.gov/lab/ivory_natural.php#whale