USGS AEM study area
![Map of upcoming USGS AEM study area in relation to state and county borders.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/maphulahoop.jpg?itok=mpUBO6Td)
Detailed Description
Map of upcoming USGS AEM study area in relation to state and county borders. The thick black lines are the intended flight profiles, and the shaded grey regions show the mapped extent of rocks deposited some 1.8 billion years ago. Mapping the subsurface geometry and distribution of these rocks is the primary goal of this survey.