Clarksville: Marble Rockhounding in Howard County, Maryland

Updated June 2026

Clarksville is a mapped rockhounding spot in Howard County, Maryland. Reported finds include marble. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Howard County
State: Maryland
Nearest road: South Wind Trail
Postcode: 21029
Coordinates: 39.20073, -76.91322

Geology at Clarksville

This spot sits on Baltimore Gneiss, mapped as gneiss that formed roughly 4600 to 540 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Baltimore Gneiss
Age: 4600–540 Ma (Precambrian)
Rock types: gneiss
Elevation: 310 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 Clarksville

Best months: February to December. Typical highs run 89°F in midsummer and 43°F in midwinter, with winter lows near 26°F.

Climate normals: NOAA 1991-2020 monthlies, LAUREL 3 W station (8 mi away).

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.

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 Clarksville

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

Marble

Nearby rockhounding spots

Other rockhounding spots within driving distance of Clarksville.

Across the state line from Clarksville

Clarksville is close enough to the Maryland border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Clarksville FAQ

Where is Clarksville?+

Clarksville is in Howard County, Maryland, at 39.20073, -76.91322. Nearest road: South Wind Trail.

What rocks and minerals can you find at Clarksville?+

Clarksville is reported to produce Marble.

Is collecting allowed at Clarksville?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Clarksville?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Clarksville?+

The most comfortable months at Clarksville are February to December.

How do I get to Clarksville?+

Open the directions link to navigate to 39.20073, -76.91322 in Google Maps. The nearest road is South Wind Trail.

More rockhounding in Maryland

See all 42 Maryland spots →

Open Clarksville on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.