Re: Good place to ask historical geology questions?


"Jo Schaper" <jonot34schaperat@xxxxxxxxxxxxxxx> wrote in message
news:13pafu24lu3po93@xxxxxxxxxxxxxxxxxxxxx
Robert Scott wrote:


It would appear that I was in an area of a thrust fault and in the Snake
Hill shale and siltstone. I live in that little part of NY that sticks
up into VT on the east side of the southern end of Lake Champlain.

Here is my grouse hunting buddy picking at the debris under the overhang
where the layer is exposed:
http://home.earthlink.net/~desmobob/images/fossilized%20plants.b.jpg

Here's a view of it:
http://home.earthlink.net/~desmobob/images/fossilized%20plants.c.jpg

Here's a close-up of the layer:
http://home.earthlink.net/~desmobob/images/fossilized%20plants.a.jpg

We were interested by it, but frustrated by our lack of knowing exactly
what we were looking at....


Could you give us some idea how thick the fibers are on this rock? How
long? There are a number of people here who will take a look at such
photos. The convention for geo photos is to put a known object into the
picture for scale: a penny, a ruler, a pencil, a hammer-- something so
those of us who weren't there could estimate size.

I didn't think to include anything for scale as I was just taking some
photos on the hunting outing, as I usually try to do. You might be able to
get a general ideal of scale by looking at my buddy's hat and head showing
in the left side of the second photo.


It superficially looks like the strands are in limestone. Are they muddier
looking than the surrounding rock?

Yes. They are in what appears to be a softer layer between other layers of
smoother, harder rock and were exposed when a soft and crumbly layer below
them eroded and fell away. (Again, refer to the second photo.) They have a
rough, "sandy" appearance and feel.

If so, and they may have contained more mud than the surrounding
limestone, they might not be plants at all, but fossilized worm tracks.

Another very helpful reader sent me some links to photos of fossilized worm
burrows; some from my local NY State Museum. They look like they might be a
match.
http://www.nysm.nysed.gov/treasures/treasureFull.cfm?object=291501&imageFormat=2

Thanks for you help,
Bob



.

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