From: Bill Payne (bpayne15@juno.com)
Date: Sun Aug 25 2002 - 23:24:19 EDT
On Thu, 15 Aug 2002 13:43:13 -0500 James Mahaffy <mahaffy@mtcnet.net>
writes:
> Too broad a statement. I brought back a big stump from a coal
(probably
> the Black Oak coal) near Pella. It was sitting right on top of the
> seam. There was a second one (obviously sigillaria) that also appeared
> to be sitting on the top of the coal and extending perhaps 20 feet up
> into the siltstone. I also believe both Bill DiMichele and Aureal
Cross
> describe areas of coal seams where there are numerous upright casts
> right at the top of the coal.
>
> Remember in underground mines you would never see them.
Hi James,
You really need to spend more time in the literature before you make such
a statement. JUST KIDDING - talk about the pot calling the kettle
black..... :-)
I came across a description of "kettles" today. From the International
Journal of Coal Geology 31 (1996), "The Westphalian D fossil
lepidodendrid forest at Table Head, Sydney Basin, Nova Scotia:
Sedimentology, paleoecology and floral response to changing edaphic
conditions", by Calder, Gibling, Eble, Scott and MacNeil; p 304:
"For roof exposures in underground coal mines, however, there is little
choice but to measure trunk diameter at the coal-roof interface
(DiMichele and DeMaris, 1987), unless the clastic filling ("kettle
bottom") has fallen out (DiMichele et al., this volume).
Bill
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