Gloss Mountain State Park: Selenite & Gypsum Rockhounding in Major County, Oklahoma

Quick details

Access

Check locally

County

Major County

State

Oklahoma

Nearest road

US 412

Postcode

73737

Coordinates

36.36850, -98.57810

Geology at Gloss Mountain State Park

This spot sits on Blaine Formation, mapped as Permian gypsum, dolostone, and shale. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit

Blaine Formation

Age

Permian

Rock types

gypsum, dolostone, and shale

Elevation

1,460 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.

Best time to visit Gloss Mountain State Park

Best months: September to June. Typical highs run 95°F in midsummer and 48°F in midwinter, with winter lows near 25°F. Summer highs average 95°F here, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, FAIRVIEW 5NW MESONET station (4 mi away).

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

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.

Sources & 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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Gloss Mountain State Park

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

• SeleniteEncyclopedia →
• GypsumEncyclopedia →