Corydon: Calcite & Fluorite Rockhounding in Harrison County, Indiana

Plan your visit

Generally open to casual rockhounding

County

Harrison County

State

Indiana

Postcode

47112

Coordinates

38.24686, -86.14915

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Access note: Blue River gravel bars below the ordinary high-water mark are publicly accessible where a legal put-in or access exists; do not cross private banks without permission. Most surrounding mineral ground is private farmland or cave land, and O'Bannon Woods State Park and nature preserves in the area prohibit collecting.

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.

Geology at Corydon

This spot sits on Blue River Group, mapped as limestone that formed roughly 360 to 325 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit

Blue River Group

Age

360–325 Ma (Mississippian)

Rock types

limestone

Elevation

690 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.

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.

• Indiana Geological and Water Survey
• Hoosier National Forest
• Indiana DNR property rules
• Community submissions reviewed against published agency rules