A red resource button will appear in the upper right hand corner when you can gather clay. (add resource button image)
You will need to move approx 1 coordinate to gather additional clay.
There is a 1 in 20 chance that you will find a piece of Flint? when gathering clay.
1 Water In Jugs = 1 Clay + 1 Jugs
Can be used to make: Rock saw (add list of buildings)