Paper tapes+rubber bands+30 yrs = mess

[Sridhar Ayengar]

Alexander Schreiber wrote:
> On Mon, Sep 08, 2008 at 05:43:12PM -0400, Sridhar Ayengar wrote:
>> bfranchuk at jetnet.ab.ca wrote:
>>> Chuck Guzis wrote:
>>>> And to make coal...
>>>>  
>>> You find a old swamp, and cover it for few million years ...
>> I don't believe it takes quite that long.
> 
> 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).

That is, if there isn't any metamorphic process of volcanic origin involved.

Peace...  Sridhar