Indiana Geology
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Learn about the pressing geologic issues that affect our state. We present information and links so that Indiana’s citizens and our representatives in state and local governments can make sound decisions based on good geologic data. Topic areas include ground water, mapping, coal, oil and gas, and seismic risk.
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Amphibian Tracks
These fossil tracks, left in the mud of a tidal flat 300 million years ago by a primitive amphibian, were discovered in Martin County by IGS geologist Erik Kvale. The balls at the ends of the toes, similar to those of modern frogs and salamanders, are characteristic of amphibians, which were at or near the top of the food chain for land animals when these tracks were made. Note the mark left between the footprints by a dragging tail. Other visible impressions include those made by insects that were probably being hunted by the amphibian. This slab is on display at the Indiana Geological Survey.
Photo by John Day
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- Bedrock and Quaternary Geology Maps
- Topography Maps
- Coal, Oil, and Gas Maps
- Road Logs
- State Parks
Guides
- Additional State Park Articles
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Modern and Ancient Tides lesson plan (middle/high school level)