RE: paleonet "shallow marine environment"

["David Kopaska-Merkel" <davidkm@xxxxxxxxxxxxxxx>]

Dee Ann

I am sure there are several different rules of thumb.  And it probably
depends on what unit you're studying.  For instance if you're studying
deposits of an epeiric sea and you're distinguishing between some that are
shallower and others that are deeper, then it depends on the depth of that
sea and whether it has a consistent difference between the deeper parts and
the shallower parts.  If you're just looking at a marine shelf like the
modern marine shelves, you might be separating peritidal deposits that would
have been deposited in water no deeper than a few meters from inner shelf
deposits that might represent meters to a few tens of meters of water or
outer shelf deposits that might represent a couple of hundred meters.  Just
define your situation and explain why you've chosen the depths you have an I
think you'll be fine.

David  


David C. Kopaska-Merkel
Geological Survey of Alabama
P.O. Box 869999
Tuscaloosa AL 35486-6999
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fax 349-2861
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-----Original Message-----
From: paleonet-owner@nhm.ac.uk [mailto:paleonet-owner@nhm.ac.uk] On Behalf
Of Dee Ann Cooper
Sent: Monday, December 12, 2005 8:37 AM
To: paleonet
Subject: paleonet "shallow marine environment"

my husband and i are working on a paper concerning an extremely fossil-rich
isochronous layer in a marine carbonate.  the further into it we get, the
more we debate how "shallow" shallow is.  is there is an exact definition of
"shallow" or a "rule-of-thumb"
definition of "shallow".  all of our "critters" seem to fall into the
"shallow marine" category and i think we have some evidence of terrigenous
input as well (i.e. kaolinite).

Dee Ann Cooper, BS, MS, PG
Phone: (409) 751-6907
Address: 17890 Nonie Lane, Lumberton, TX  77657