FIELD Rockhounding in Louisiana
Petrified palmwood and river-gravel agate — Louisiana has almost no bedrock, so its collecting is all about fossils and the treasure that rivers carry down from upstream.
Louisiana sits on thick, young river and delta sediment — there’s essentially no hard bedrock to quarry. That makes it a state for fossils and gravel-bar collecting: petrified palmwood (the state fossil) across the uplands, and agate and jasper that the rivers carried south from the Rockies and the Plains.
The geology behind the finds
Ancient and modern rivers — the Red, the Sabine and their relatives — laid down gravel bars full of material tumbled from far upstream: agate, jasper and petrified wood. In the Tertiary uplands, silicified petrified palmwood (with its distinctive rod-and-dot pattern) became abundant enough to be named the state fossil. There’s little in the way of crystalline minerals, but plenty for the patient gravel-walker.
What you’ll find
Classic Louisiana material
- Petrified palmwood (state fossil)
- Agate, jasper, chert — river gravels
- Petrified wood
- Fossil shells & teeth
Before you go
- Gravel bars and pits are often private — ask permission.
- Low water (winter) exposes the best gravel.
- Read ethics & law first.
Petrified palmwood is the keepsake to chase — its bundles of “rods” make a striking polished cabochon, and it’s common enough in the uplands to reward a careful search. The river gravels add agate and jasper for cabbers, while the Tertiary beds give up fossil shells and shark teeth.
Where to go, region by region
River gravels & pits
Gravel bars and commercial pits along the major rivers carry agate, jasper and petrified wood washed from upstream — collect with the operator’s or landowner’s permission.
The uplands — petrified palmwood
The Tertiary uplands of west and central Louisiana are the home of petrified palmwood, found in soils and gravels with permission.
When to go
The Louisiana collecting season is the low-water winter — falling river levels expose the gravel bars where agate, jasper and petrified wood concentrate. The cooler, drier months are also more comfortable for fieldwork.
Gear & field tips
- Work freshly exposed gravel at low water; wet stones to spot agate and palmwood.
- A simple screen helps sort gravel for smaller pieces and fossils.
- Most gravel bars and pits are private — get permission first.
Rules & access
Louisiana’s gravel bars and pits are largely private, so permission is the rule. There’s little public collecting ground given the lack of bedrock. Read our guide to collecting ethics & the law.
Clubs & shows
South Central Federation clubs are active in Louisiana and know the productive gravel bars and pits. Browse our clubs directory.
Want polished petrified palmwood?
Sponsored — partner shop · Minerals KingdomFrequently asked questions
What is petrified palmwood?
Silicified ancient palm, recognisable by its pattern of rod-like bundles. It’s Louisiana’s state fossil and a popular lapidary material.
Where can I find agate in Louisiana?
In the gravel bars and pits of the major rivers, which carry agate and jasper down from upstream. Collect with the landowner’s or operator’s permission, at low water.
Does Louisiana have hard-rock minerals?
Very few — the state is thick young sediment with no real bedrock, so its rockhounding centres on fossils and river-gravel material.