Sean Pitman and the Coconino Sandstone
- From: "Carsten Troelsgaard" <carsten.troelsgaard@xxxxxxx>
- Date: Mon, 23 Jan 2006 12:45:39 +0100
I copied the below from your site
http://www.detectingdesign.com/fossilrecord.html
Quote
Other dry-land features, such as raindrop impressions, crisp and steep
leeward dune fracture faces and cracks in the sand, and the preservation of
spider trackways are often cited as evidence in support of this dry-land
formation hypothesis in opposition to Brand's underwater hypothesis. This
dry land hypothesis quite reasonable in many respects that seem to require
open air exposure, but there are still a few other very puzzling features
that do not seem so consistent with a true desert-like environment or dune
formation.
What is rarely mentioned in the literature is that the vast majority of the
Coconino trackways all head uphill.66 Evidently the lizards/amphibians,
arthropods, spiders and other creatures living in ancient deserts did not
like going downhill much at all. Also, trackways often start and stop
suddenly without evidence of sand-shift or disturbance - like the creature
suddenly vanished into thin air (or swam off in the water).66,67,68
Snip
Ocean currents can and do make very pure quartz sand dunes with specific
characteristics that match the dunes in the Coconino Sandstone.71 Heavy
ocean currents can in fact amass huge quantities of sand in a very rapid
timeframe. The sand dune angle found in the Coconino Sandstone layers would
require a depth of water of around 300 feet and a fairly brisk current. In
such a scenario, large dunes with cross bedding can be made very quickly.
UnQuote
You seem in part to acknowledge a desert environment recognized in the
sandstone and appear to reconcile two different interpretations into one.
Emplacing a large body of sand by oceancurrents happens by entraining and
suspending sand in /turbulent/ water. Your indication that a event like this
still leave fragile trace-fossils inspite of the violent nature you try to
impose as a caurse leave me in great awe for your imagination, and little
respect for your geological insight.
The sedimentary environments between 300m marine depth and dry desert leave
a host of recognizable characterietic facies (shore, bermcrest, ripples, ..
you name it ..). You may put my attention to it, if I missed their presence.
To weight your choise between the two, I suggest you take up on 'sequence
stratigraphy', as a tool to put separate formations into a relative
geological context to each other ... or simply make a more educated pick
between one of the two interpretations.
The geologist
.
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