In the Siberian region of Russia, the earth separated to form an isolated land mass, with the formation of sediment now known as Cambrian blue clay. The Cambrian beds are unusual in that they contain sand and clay which has been largely undisturbed for this period of time.  Benefits you ask?
Oh My Goodness Sooo Many!  Worth placing on your face? Absolutley! 
Anti-inflammatory
Stimulation of the growth of skin cells and collagen
Detoxification of the body
To name only a couple benefits....
 
4oz Tin of Clay will last for several uses