Caledesi Causeway Banks: Chalcedony Rockhounding in Pinellas County, Florida

Plan your visit

Generally open to casual rockhounding

County

Pinellas County

State

Florida

Nearest road

Honeymoon Island Trail

Postcode

34660

Coordinates

28.05778, -82.80887

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: Public access along the Dunedin Causeway toward Honeymoon Island. Collecting is prohibited within Honeymoon Island State Park and Caladesi Island State Park, so search the causeway banks and public beach outside the park boundary. Invertebrate fossils need no permit.

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 Caledesi Causeway Banks

Comfortable months (45 to 90°F highs)

Best months: September to June. Typical highs run 91°F in midsummer and 69°F in midwinter, with winter lows near 51°F.

Climate normals: NOAA 1991-2020 monthlies, TARPON SPGS SEWAGE PLT station (7 mi away).

Geology at Caledesi Causeway Banks

This spot sits on sediments, mapped as sand that formed within roughly the last 12,000 years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit

sediments

Age

< 1 Ma (Holocene)

Rock types

sand

Elevation

20 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.

• Florida Geological Survey
• Florida Museum vertebrate fossil permit
• Florida State Parks rules
• Community submissions reviewed against published agency rules