Caledesi Causeway Banks: Chalcedony Rockhounding in Pinellas County, Florida
Updated July 2026
The causeway and beaches near Dunedin and Honeymoon Island are cited as one of the best remaining public sources of agatized coral and chalcedony in the Tampa Bay region. Wave-washed gravel along the causeway banks concentrates silicified coral, carnelian, and chalcedony that erode from the underlying Tertiary beds. The material is invertebrate fossil coral, so no state permit is needed. Reported finds include chalcedony. Below: coordinates, access notes, nearby spots, and trip-planning links.
Caledesi Causeway Banks photos
Public image records connected to this spot or its reported material.
Map showing Caledesi Causeway Banks in Pinellas County, Florida
Quick details
- Access
- Public area
- County
- Pinellas County
- State
- Florida
- Nearest road
- Honeymoon Island Trail
- Postcode
- 34660
- Coordinates
- 28.05778, -82.80887
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.
Best time to visit Caledesi Causeway Banks
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).
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 Caledesi Causeway Banks
Each chip 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 Caledesi Causeway Banks.
- DunedinPinellas County, Florida · 2 mi awayGeode
- Flor-a-MarPasco County, Florida · 13 mi awayAgatized Coral, Chalcedony
- Pinellas & Hillsborough BeachesPinellas County, Florida · 20 mi awayAgate, Carnelian, Chalcedony
- Unnamed Area (Agatized Coral #1)Hillsborough County, Florida · 23 mi awayAgatized Coral, Geode
- Unnamed Area (Agatized Coral #2)Hillsborough County, Florida · 23 mi awayAgatized Coral, Coral, Chalcedony
- Hillsborough RiverTop pick in FloridaHillsborough County, Florida · 26 mi awayBrain Coral, Finger Coral, Agate
- Pasco CountyPasco County, Florida · 30 mi awaySilicified Coral
- BrooksvilleTop pick in FloridaHernando County, Florida · 43 mi awayCalcite, Echinoid Geode
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