060-11 Wyo. Code R. § 11-7
(a) A royalty often percent (10%) of the gross sales price without deduction of any costs including but not limited to: quarrying, preparation, and marketing, for fossils identified as royalty bearing in section 6(a) and (b) shall be paid no less than quarterly.
(b) In addition, upon termination of any commercial fossil permit for whatever cause, all fossils subject to a royalty removed and in the possession of the permittee either at the site or any other location used by permittee for preparation and/or sales, will be inventoried by the Office and valued at the then current market price as established based upon specimen status, sales receipts and outstanding orders and quotes unless otherwise agreed by the Board. Permittee will be required to pay the prescribed royalty rate based on the value established herein. No fossils other than the common and approved fish genera and specimens listed in Section 6(a) and (b) hereof may be retained without Board approval.
060-11 Wyo. Code R. § 11-7