Dakhleh Glass 					Location Egypt


Please not be confused -- it is not the Libyan Desert Glass. It is quite different and from different area. 
You can find all the info published in the Meteoritics & Planetary Science 43, Nr 12, 2089–2107 (2008). 
The article is: 
The Dakhleh Glass: Product of an impact airburst or cratering event in the Western Desert of Egypt?

So this is an impact glass, probably formed after a huge meteorite fell in a lake. 
Ice age (Q1), about 120-40 thousand years ago. Oasis Dakhla, Western Egypt Desert.