ON THE ROCKS Presents

Fossil Digging in Wyoming

Your Best Day of Fishing Ever!

June 20, 2026

Trip Coordinator: Rob Diedrich

Trip Description

Join RMAG on June 20th for a family‑friendly trip to Tynskys Quarry in Kemmerer, Wyoming, where we’ll dig for Eocene‑aged fish fossils from the Green River Formation. Tynskys is a family‑owned quarry, and participants may keep all the fossils they find—except for rare specimens. Guides, digging and splitting tools will be provided, though you’re welcome to bring your own rock hammer. Children of all ages are welcome; ages three and under are free. A previous RMAG participant states “this was the best day of fishing I ever had.”

Meeting Location & Start Time

We’ll meet at 8:00 a.m. at Tynskys Fossil Shop, 716 JC Penney Dr. in downtown Kemmerer, WY.  After a brief safety talk and completion of waiver forms, we will caravan to the quarry. The road to the site can be rough, so high‑clearance vehicles are strongly recommended. Carpooling will be available for those who prefer not to drive to the quarry site.

What to Expect & What to Bring

We will spend the morning digging and should finish around lunchtime. Please bring your own food, lots of water, and snacks. Please wear a sun hat and bring sun and wind protection and sturdy closed‑toe shoes (no sandals). Participants should bring boxes to carry their fossils—produce boxes from grocery stores (also Costco/Sam’s) work especially well-- and newspaper to wrap your finds.

Lodging

Kemmerer is a seven-hour drive from Denver.  A room block has been reserved at the Best Western in Kemmerer for Friday night June 19^th. To book a room, call (307-877-388 by May 25th. 

Other

If time allows, consider a quick side trip to Fossil Butte National Monument. It’s only 25 minutes from Kemmerer and showcases remarkable fossil displays. Plan Your Visit - Fossil Butte National Monument (U.S. National Park Service)

Cost

• $170 for members and members family
• $195 for non-members. (not a member? click here to join)
• Are you a student? email staff@rmag.org

 Cost cover the quarry fee and rmag adminsitrative time. 

Registration

Registration Closes June 15, 2026. 

Refunds for the June 20th, trip are only available until June 5, 2026

If you are unable to attend, your registration for all RMAG events are transferable. RMAG members may transfer their registration to another RMAG member, and non-members can transfer their registrations to whomever they wish. Should an RMAG member wish to transfer their registration to a non-member, the non-member would need to pay the balance between the member and non-member price.

Waivers

All registrants must fill out the Waiver and Release of Liability and Medical Emergency Form. Those who fail to complete these form will not be permitted to attend the field trip.