Unknown Mammalian Jaw in Amber Bearing Rock

This is a jaw of a mammal that was found in a Mexican amber mine.  To be more specific, it was found in the amber mine "Polcitos" which is located near Simojovel in Chiapas, Mexico.  As far as I know, I have never heard of anything like this being found in an amber mine.  This was, and came straight from the miner.  This is as much as I know about it.  I do not know what specific animal it came from nor anything else.  I will admit that I would love someone help to ID the jaw and to tell me anything they know about it.

Size and shape.: There is a break in the jaw (easily seen).  The entire jaw is about 4 inches long by 1.25 tall and .25 in width.  The miner did send this video of the jaw.

How about it - can anyone help me on this?

By the way, I am not particularly interested in selling it since this is such a novel and rare specimen.

Email me at lundberg@ambericawest.com