National Geochronological Database: Radiometric and fission-track age determinations of geologic materials from the continental US and Alaska
Geochronology
|
|
Geographic reference | |
OpenStreetMap | |
Shaded relief | |
US States | |
US Counties | |
US county names | |
USGS map quadrangles | |
Map quadrangle names |
Need more? You can View, Download, and Understand this data source at https://MRData.usgs.gov/geochron/.
Show available data layers | |
Layer not shown on map | |
50 | Sliders affect layer transparency. |
Show named geographic areas | |
Ohio | Click linked area names (subdivisions or overlapping areas) |
Shows the area on the map |
Click the map to show data near to the point you clicked. |
A report opens in a new window. |
Click the section headings to expand or collapse reports. |
To select data from a rectangular area, hold the Ctrl key (use Cmd key on Macs) and drag the pointer. |
Don't search a large area this way, it takes too long. Zoom in instead. |