Welcome to the USGS GeoLog Locator

Welcome to the USGS GeoLog Locator, an online tool for viewing and downloading digital borehole geophysical logs. These borehole logs are used to answer scientific questions about things like groundwater availability, geologic structure of the Earth, and certain characteristics of the structure of the soil and rock formations. The Geolog map viewer allows users to zoom and click on individual borehole locations. There they can view and download available logs. The locator is also fully searchable. Users can select by state, county, USGS site number or station name, or by using a geographic extent. Likewise, you can search by log criteria like borehole type or data file format. As new logs become available, they will be added to the database. Dig around and explore, the USGS GeoLog Locator.