Research24.7 mi
Alpena / Thunder Bay Devonian Fossil Research
Devonian corals, brachiopods, stromatoporoids and limestone fossils
Core atlasMICHIGAN LOCAL FIELD REGION
Thunder Bay Devonian Limestone Rockhounding Guide
Marine fossil research and limestone units around northeastern Michigan.
LOCAL INTERACTIVE MAP
Thunder Bay Devonian Limestone local map
Explore nearby Michigan records without leaving this hub. Status, coordinate precision and access evidence determine whether a pin is a realistic field destination.
Map
Land intelligence
Precision
This hub map shows nearby records only.Land and claim layers are planning aids, not collecting permission.
Reference photograph used for rock and mineral identification. It is not from this exact location or a guarantee that collecting is permitted.
Mapped leads in Thunder Bay Devonian Limestone
The records below may represent collecting sites, managed programs, protected resources or research-only geology. Their individual status is more important than proximity.
Research35.1 mi
Michigan Septarian Concretion Research
septarian concretions, calcite and sedimentary structures
Core atlas