8 Sep
2008
8 Sep
'08
3:40 p.m.
Alexander Schreiber wrote:
On Mon, Sep 08, 2008 at 05:43:12PM -0400, Sridhar
Ayengar wrote:
That is, if there isn't any metamorphic process of volcanic origin involved.
Peace... Sridhar
bfranchuk at jetnet.ab.ca wrote:
It takes even longer. Most black coal dates back to the Carbon era
(about 300 .. 360 million years ago). Brown coal, which hasn't changed
that much from the original wood-in-a-swamp mix (we sure found plenty of
chunks of wood in it) is much younger, from the Tertiary era (about 2.6
to 65 million years ago). Chuck Guzis wrote:
I don't
believe it takes quite that long. And to make coal...
You find a old swamp, and cover it for few million years ...