Geology       Geology is another popular area at the Petroglyphs site. We do a number of programs each year. Some of the topics we cover include telling about the way the land formed, samples of different rocks from the area, topography, and other displays and activities. Minnesota Topographical Map Minnesota Topographical Map 2 -- reduced version of the 15 meg map listed below. Cottonwood County in 3D (red/cyan glasses required) -- clipped from the 15 meg map listed below.       We also have a number of activity pages available for children (and adults, if they wish!). These are in PDF format, and include: Soil Structure The Rock Cycle Natural Rock Art Agates, Geodes, and Septarian Nodules Agates, Geodes, and Septarian Nodules -- same page, different images Minnesota Bedrock Geology South Dakota Bedrock Geology Iowa Bedrock Geology Minnesota Bedrock Age Minnesota Soil Parent Materials Minnesota Watersheds (River Drainage Systems) Minnesota Elevation Map Soil Types of the United States Vegetation of the United States Here's some other sites you may find useful. Minnesota Geological Survey website. They have a lot of very good information, including Common Minnesota Rocks (PDF file) and The Virtual Egg Carton, an online page with examples and information. Soils and Landscapes of Minnesota -- VERY detailed information on the soil. 3-d Topographical Map of Minnesota -- HUGE file (15 megs), requires red/cyan 3d glasses, but absolutely INCREDIBLE. "The Glacial Lake Agassiz" by Charles D. Walcott, USGS, 1895 Other state bedrock geology images Main Page