Investigate concepts in geology
First-hand observation, that is, getting outdoors to see the local landscape for yourself is a great way to investigate our local geology. However, you may find it helpful to first learn a little about what geologists have discovered about our area and about the earth in general. With this knowledge in mind, you will be able to better understand what you observe for yourself.This part of our web site features the forces behind the changes that have taken place over millions of years.
In the Big picture, you can explore two concepts:
These concepts help us to understand that the earth is a dynamic planet and that even Ohio and the surrounding areas have had diverse climates and landscapes.
In the Local picture, you can explore what life was like in the Ordovician Period, which occurred between about 505 and 438 million years ago. Named for the Ordovices, an ancient Celtic tribe, the Ordovician Period marked the time when brachiopods, bryozoans, corals, crinoids, echinoderms, and trilobites prospered in the warm shallow sea that covered the tri-state region. Limestone, which was formed from lime, mud, and fossil shells, and shale, a rock formed from silt and clay, are a great repository for these ancient sea fossils. Learn more about them and where to find them in Places of interest and on the Ohio geology maps.
