Taxed2Death, I do believe the "substance" is called iridium. It's something commonly found in "extra terrestrial" rocks IE: asteroids. What makes it so interesting is that there is a fine layer of it spread across the world. Again, not anywhere you decide to dig a hole, because the earths crust is a ocnstantly changing thing, but when you find this at various points across the world, it suggests that something catastrophic happened to spread that layer over such a great distance. I believe it is also evidence of Pangea, the one giant continent that once existed.
I think this is a great discussion, I wish I had the time to thoroughly do all the research I want, but oh well.
1999 Silver Frost SVT #609 of 2760 Born on 12/3/98
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"How much must I live through just to get away..."