Greetings @curtis-mckibben ! My best answer regarding the crystallization of your specimens is mineral intrusions of things like calcite, silica, or selenite into the fossil . This often occurs when environmental changes occur in the geological matrix in which the fossil is preserved.

Greetings @curtis-mckibben ! Did you also find this specimen in Spokane as with your jaw segment? I have reservations with the tooth ID. The lithology around Spokane is incredibly complex and consists of igneous and metamorphic rocks. There are considerable Pleistocene sedimentary deposits. The Miocene Latah Formation also makes an appearance in…[Read more]