How to use Make-a-Map

On entering Make-a-Map, you will see a fully coloured geological map of the British Isles, with a key to the left. The colours on the map and key match those used in the BGS Timechart.

Each of the colours on the map can be turned on or off using the corresponding button to the right of the key. Clicking the button toggles the colour on and off on both the map and the key.

Placing your cursor over any of the blue ‘information’ buttons on the left of the key causes the relevant geological period from the BGS Timechart to replace the map in the main window. For more details about the information shown, or to download the Timechart as pdf files, visit the BGS Timechart web page.

If you place your cursor over a coloured square to the right of any of the blue information buttons, the age range for the relevant geological unit is displayed.

Note: The ‘mouse-over’ functions described above are not available for the igneous rock units as these are not subdivided by age.

There are also five buttons at the foot of the key. These buttons have the following functions:

  • Coast: toggles off/on the coastline (if ‘Linework’ is turned off)
  • Land/sea: toggles off/on the blue colour used for areas of sea (land is always white)
  • Linework: toggles off/on the geological boundaries (and coast if ‘Coast’ is turned off)
  • Locations: toggles off/on place names
  • Exit: exits Make-a-Map application

In addition, pressing the F11 function key will, in most browsers, toggle full-screen viewing on and off.

To print your customised maps, right-click for print options (Ctrl-click on Apple computers with one mouse button).

Right-clicking your mouse also provides the option to zoom in.