October 19 is National Geologic Map Day. This is a recognition of the significance of this form of mapping, that seeks to map the earth beneath the surface. These maps convey important information about the geology of regions. They are also esthetically pleasing uses of color and shape.
In recognition, the United States Geological Survey releases a greatly revised resource, the National Geological Map Database, which provides access to a large database of geological maps through a Map Catalog, of over 90,000 maps from the USGS as well as more than 600 other publishers. A new Map Viewer offers an additional discovery tool. Another important resource at this site is Stratigraphy to identify geological names, charts and guidelines.
Miami University Libraries has geological maps in various forms, both digital and in print format. The Geology subject guide includes the page Geological Mapping, that describes many of these publications, maps, and resources. USGS maps, maps by the Ohio Geological Survey, and various recently published maps by other state geological surveys are descibed here. Included are several recent maps, as well as classic maps that have retained importance through the years. To find such resources in the catalog, a Subject search with the terms "Geology," regional name, and "Maps." For example , the 2005 Geologic Map of North America is listed with the subject Geology - North America - Maps. This will also retrieve the related Database of the Geologic Map of North America. Both of these items are in the Libraries collections, as well as available as web pages at the USGS site.
Books about geologic mapping are available with the subject Geological mapping. A book by Simon Winchester, The Map that Changed the World : William Smith and the Birth of Modern Geology, describes the creation of the world's first geological map, of Great Britain, in the early decades of the 1800s. Reproductions of two versions of this map are on view in the Geology Department in Shideler Hall. Other siginifcant geological maps are viewable there, as well as in the Libraries collections.