Mangum: Agatized Wood Rockhounding in Greer County, Oklahoma
- Mineral reported
- 1
- Elevation
- 1,550 ft
- Best months
- September to June
Greer County in southwestern Oklahoma, around Mangum, produces agatized and petrified wood along with alabaster and selenite from the region's Permian gypsum and red beds. The area lies in the state's gypsum belt, where massive alabaster is quarried and silicified wood turns up in the surrounding gravels. It anchors the southwest corner of Oklahoma's rockhounding map. Reported finds include agatized wood. Below: coordinates, access notes, nearby spots, and trip-planning links.
Plan your visit
Permission required before collecting
- County
- Greer County
- State
- Oklahoma
- Nearest road
- US 283;OK 9;OK 34
- Postcode
- 73554
- Coordinates
- 34.92654, -99.50431
Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.
Land & collecting status
Permission required before collecting
Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.
Access note: Collecting sites are on private ranch and farmland, so landowner permission is required, and some historic digging areas have closed. Do not enter quarry property without authorization. Public road right-of-ways and creek crossings give the most straightforward legal access.
Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.
Best time to visit Mangum
Comfortable months (45 to 90°F highs)
Best months: September to June. Typical highs run 95°F in midsummer and 52°F in midwinter, with winter lows near 25°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.
Climate normals: NOAA 1991-2020 monthlies, MANGUM station (2 mi away).
Geology at Mangum
This spot sits on Alluvium, mapped as fine alluvium that formed within roughly the last 12,000 years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.
- Mapped unit
- Alluvium
- Age
- < 1 Ma (Holocene)
- Rock types
- fine alluvium
- Elevation
- 1,550 ft
Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.
Today's weather
Is today a good day to go?
The app shows live weather, recent rain, and a daily rockhounding score for Mangum.
Get the appSources & verification
Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.
- Salt Plains National Wildlife Refuge, selenite digging
- Oklahoma Geological Survey
- Ouachita National Forest
- Community submissions reviewed against published agency rules
Found at Mangum
Each name opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.
Nearby rockhounding spots
Other rockhounding spots within driving distance of Mangum.
- Beckham CountyGreer County, Oklahoma · 7 mi awayAlabaster, Selenite, Petrified Wood
- MangumGreer County, Oklahoma · 7 mi awayAlabaster, Quartz
- AltusJackson County, Oklahoma · 23 mi awaySmoky Quartz
- Wichita MountainsComanche County, Oklahoma · 46 mi awayAmphibole, Zircon
- ApacheCaddo County, Oklahoma · 59 mi awayFluorescent Calcite
- RandlettCotton County, Oklahoma · 84 mi awayMalachite
- Seiling & TalogaDewey County, Oklahoma · 86 mi awayAgate, Jasper, Petrified Wood
- Blaine CountyBlaine County, Oklahoma · 94 mi awayPriceite, Proberite, Ulexite
Across the state line from Mangum
Mangum is close enough to the Oklahoma border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
- General AreaChildress County, Texas · 41 mi awayAlabaster
Mangum FAQ
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More rockhounding in Oklahoma
See all 36 Oklahoma spots →
Open Mangum on the map
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