FIELD Rockhounding in Mississippi
Petrified wood, agatized fossils and Eocene whale bone — Mississippi is gravel-bar and fossil collecting in the Deep South, capped by one of the country’s great petrified forests.
Like its Gulf neighbours, Mississippi has little hard bedrock, so its collecting centres on petrified wood, river-gravel agate, and a rich marine fossil record. The state even has its own petrified forest near Flora, and its Eocene rocks gave up the giant whale Basilosaurus — the state fossil.
The geology behind the finds
Mississippi’s Tertiary sediments buried ancient forests that silica replaced into petrified wood, most spectacularly at the Mississippi Petrified Forest near Flora. River gravels carry agate, jasper and chert down from upstream, and the state’s Eocene marine beds preserved whales, sharks and shellfish from the time the Gulf reached far inland.
What you’ll find
Classic Mississippi material
- Petrified wood — uplands & gravels
- Agate, jasper, chert — river gravels
- Marine fossils — Eocene beds
- Fossil shells & shark teeth
Before you go
- Mississippi Petrified Forest (Flora): no collecting — it’s a protected site.
- Gravel bars are often private — ask permission.
- Read ethics & law first.
Petrified wood is the everyday Mississippi find — abundant in the uplands and gravels (though never collected at the protected Flora forest). River agate and jasper reward cabbers, and the Eocene marine fossils — shells, shark teeth and occasionally whale bone — make the state a quiet fossil destination.
Where to go, region by region
River gravels & uplands
Gravel bars and Tertiary uplands across the state yield petrified wood, agate and jasper — collect with the landowner’s permission.
Eocene fossil country
The Eocene marine beds (which produced the state-fossil whale) yield shells, shark teeth and marine fossils at the right exposures.
What to skip
The Mississippi Petrified Forest at Flora is a protected attraction — enjoy the trail, but collecting there is prohibited.
When to go
Mississippi collecting is best in fall and winter, when low water exposes gravel bars and the humidity eases. Rain freshly washes petrified wood and fossils out of the uplands and exposures.
Gear & field tips
- Work freshly exposed gravel at low water; wet stones to spot agate and petrified wood.
- A screen helps sort gravel for smaller fossils and teeth.
- Get landowner permission for gravel bars and exposures.
Rules & access
The key rule: the Petrified Forest at Flora prohibits collecting. Elsewhere, gravel bars and exposures are largely private, so get permission. Read our guide to collecting ethics & the law.
Clubs & shows
Southeast and South Central Federation clubs are active in Mississippi and know the productive gravels and fossil sites. Browse our clubs directory.
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Can I collect at the Mississippi Petrified Forest?
No — the Flora site is a protected attraction with a walking trail; collecting there is prohibited. You can find petrified wood elsewhere in the uplands and gravels with permission.
Where can I find agate in Mississippi?
In the river gravels, which carry agate and jasper down from upstream. Collect at low water with the landowner’s permission.
What is Mississippi’s state fossil?
The prehistoric whale Basilosaurus (the “zeuglodon”), from the state’s Eocene marine rocks.