Geology Resources

Bedrock Geology

Bedded rock in ceilings and walls of a side passage in Illinois Caverns

Caves in Illinois: Our Subterranean Landscape

A slice through Karst in southwestern Illinois

Karst Landscapes of Illinois: Dissolving Bedrock and Collapsing Soil

Earth Resources and Mining

Pennsylvanian Coal Swamp

Coal Formation in Illinois

Surface mining at Arch of Illinois’ Captain Mine, near DuQuoin.

Coal: Illinois' Black Treasure

Close up of a pyrite, esfalerite and quartz mineral from trepca, bosnia and herzegovina. Source: http://www.stockfreeimages.com/

Gold: Its Occurrence in Illinois

Salem Oil Field—1943, Marion County, Illinois

History of Oil and Gas Production in Illinois

figure 1: History of Illinois Coal Production. Source: Energy Informaiton Administration

Illinois Energy Production and Consumption

Oil Fields in Illinois

Oil Fields in Illinois

Glacial Geology

Quaternary sediment over standstone bedrock

Classification of Quaternary Time and Deposits

Formation of an end moraine

End Moraines: the End of the Glacial Ride

This photo of the Fox River Stone Company quarry near St. Charles, Illinois, shows approximately 100 feet of glacial drift over bedrock.

Evidence for Glaciation

maximum extent of glacier ice in North America during the last glacial maximum about 20,000 radiocarbon years ago

Glacial Geology Overview

Knik Glacier, Alaska

Glacial Sedimentary Environments and Deposits

Figure showing Late Wisconsin ice sheets and glaciers, and the maximum extent of older Quaternary glaciations

Quaternary Glaciations in Illinois

Quaternary History in Illinois

Quaternary History in Illinois

Mineralogy, Crystallography, and Rocks

Boulder moved by glaciers from Canada to Illinois

Exotic Rocks... or Erratics are Erratic

Four pieces of flourite.

Fluorite: Illinois' State Mineral

A variety of geodes

Geodes: Small Treasure Vaults in Illinois

Guide to Rocks and Minerals of Illinois

Guide to Rocks and Minerals of Illinois

A Pyrite "sun," or "miner's dollar," in Anna Shale

Paleontology

composite image of a stag moose, a mastadon tooth and a peccary

Build Illinois: The Last 500 Million Years

Guide for Beginning Fossil Hunters

Guide for Beginning Fossil Hunters

Wooly Mammoth

Ice Age Residents of Illinois

Illinois' State Fossil Tullimonstrum gregarium

Illinois' State Fossil Tullimonstrum gregarium

Typical Mississippian Fossils

Mississippian Rocks in Illinois

Common Pennsylvanian plants: lycopods, sphenophytes, and ferns.

Pennsylvanian Rocks in Illinois

Ceraurus cf. pleurexanthemus Green. Found in Ordovician age rocks of the Grand Detour Formation, Platteville Group, near Rockford,Illinois is shown approximately life size).

The Trilobite: An Early Inhabitant of Illinois

Physical and Chemical Processes

faults in Illinois

Faults in Illinois

Saline Mines et al-surficial geology

Formation of Hicks Dome in Southern Illinois

Pangea-250 million years ago

Plate Tectonics: Mysteries Solved!

Illinois State Geological Survey

Richard C. Berg, Director
615 E. Peabody
Champaign, IL 61820
217-333-4747
info@isgs.illinois.edu

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