Research Target Formations and Index Fossils
3 hoursIdentify geological formation age and index fossils for site; download state fossil regulations and land access rules.
Field context
This workflow is part of 4 niche fields
Complete guide for fossil hunting expedition — step-by-step workflow, tools, checklist, and expert tips to get started.
Identify geological formation age and index fossils for site; download state fossil regulations and land access rules.
Pack rock hammer, chisels, dental picks, consolidant, aluminum foil, and toilet paper for fragile specimen wrapping.
Walk eroding slopes after rain; look for contrasting color and symmetry in matrix; do not extract until ID confirmed.
Remove fossil with surrounding matrix when fragile; label with formation, GPS, and date; report significant finds to state survey.
Determine formation age of target site to predict fossil types and required collecting permits.
Document formation name, GPS coordinates, and extraction context for every fossil collected.
Photograph fossils in situ before extraction for scientific provenance documentation.
Plan field day duration and extraction time budgets for fragile specimen work.
Productive formations and typical finds.
| Formation | Age | Common Fossils |
|---|---|---|
| Green River | Eocene | Fish, plants, insects |
| Ordovician shale | Ordovician | Trilobites, brachiopods |
| Niobrara chalk | Cretaceous | Ammonites, mosasaur verts |
| Pennsylvanian coal | Carboniferous | Plants, trackways |
Erosion exposes fresh fossils on slopes — first search after rain is most productive.
Keep fossil in matrix for stability — strip matrix at home under microscope.
Vertebrate fossil collecting on federal land requires permit — unauthorized collection is felony.