Where to Find Chert in Wyoming

Wyoming has 5 mapped collecting spots that report chert, spread across 2 counties. The largest share sits in Sweetwater County County with 4 spots. 5 of the spots are on land mapped as publicly accessible.

Spot list checked against source data on April 1, 2026.

Standout chert spots in Wyoming

Hand-picked from the full list below, with the reason each one earns a trip.

Kemmerer
Lincoln County County
Kemmerer anchors the western Green River Formation belt, where public-land outcrops and gravels can yield chert, chalcedony, jasper, silicified wood, and fossiliferous lapidary stone. It is included separately from the paid fossil-fish quarries because the best free collecting value is common lapidary material on verified public parcels, not commercial quarry access.

Best counties for chert in Wyoming

Ranked by the number of mapped chert spots. County links open the full rockhounding page for that county.

Every chert spot we track in Wyoming

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
KemmererEmigrant Trail	Lincoln County	Turritella Agate Chalcedony Chert Jasper Quartz Petrified Wood Silicified Wood	41.8114, -110.4780	Public
Farson	Sweetwater County	Agate Chalcedony Chert Jasper Quartz Silicified Wood	42.1694, -109.4311	Public
Red DesertTipton-North Road	Sweetwater County	Agate Chalcedony Chert Jasper Quartz Silicified Wood	41.8194, -108.2799	Public
Rock Springs	Sweetwater County	Agate Chalcedony Chert Jasper Quartz Silicified Wood	41.6163, -109.1605	Public
Sweetwater CountyWY 374	Sweetwater County	Agate Chalcedony Chert Jasper Petrified Wood Silicified Wood Quartz Turritella Agate	41.5388, -109.4846	Public

Before you go

Read the chert identification guide so you know what a keeper looks like in the field: Chert in the encyclopedia.

Chert in Wyoming FAQ

Where can you find chert in Wyoming?+

The mapped spots concentrate in Sweetwater County County and Lincoln County County. Every spot on this page appears on the map above with coordinates and access notes.

How many chert spots are mapped in Wyoming?+

5 spots across 2 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.

Is it legal to collect chert in Wyoming?+

Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 5 of the 5 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.

Where else to find chert

More minerals to hunt in Wyoming

Hunt chert in Wyoming with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.