The chart below is the Key Reference for the colour coding of the geological structure.
Not all colours apply to every map.
As this chart is common to all of the county maps it is not available for sale,
nor can it be a part of the sale of any one map.
If this is of interest to you, you may copy this image to your own computer.
The most common process is as follows:
Place your cursor over the image.
Right click for a menu of tasks.
Select: Save Image As ... ( this may vary between computers).
Select a destination on your computer, and save the image file.