It is the Meadowcroft Rock Shelter about which I
would like to get updated,

On May 11, 12:45 pm, David <pchristain... at (no spam) yahoo.com> wrote:

It is the Meadowcroft Rock Shelter about which I
would like to get updated,

The Late Pleistocene Dispersal of Modern Humans
in the Americas
Ted Goebel, et al.
Science 319, 1497 (2008);

"At Meadowcroft Rockshelter, artifacts occur in sediments
that may be as old as 22 to 18 ka (62),but it is the record
 post-dating 15.2 ka that is especially interesting. This is
 the uppermost layer of lower stratum IIa, which produced a
small lanceolate biface and is bracketed by datesof 15.2 and
 13.4 ka. Acceptance of the site,however, hinges on resolution
 of dating issues(63)."

62. J. M. Adovasio, D. R. Pedler, in Entering America:
Northeast Asia and Beringia before the Last Glacial
Maximum, D. M. Madsen, Ed. (Univ. of Utah Press,
Salt Lake City, 2004), pp. 139–158.

63. C. V. Haynes Jr., in Paleoamerican Origins: Beyond
Clovis, R. Bonnichsen, B. T. Lepper, D. Stanford,
M. R. Waters, Eds. (Center for the Study of the First
Americans, Texas A&M Univ. Press, College Station, TX,
2005), pp. 113–132.

Roosevelt (2002:175)
"That contamination has occured is indicated by the fact
that carbon solutes were more abundant than, and dated
 older than, the carbon solids (Haynes 1991). It's lithics
were rare, and its paleolithic environmental materials
inconsistent with its radiocarbon age."

Fiedel, Stuart J. 2000 The peopling of the new world:
 Present evidence, new theories, and future directions.
 Journal of Archaeological Research 8(1):39-103.

"Detail plan views have yet to be published."
Fiedel thinks the point looks like an Agate Basin.
 I agree, for what little that's worth.

I have to paraphrase Dincauze here because I can't find
her paper. But she noted that the one, non-diagnostic
bifacial point found at the alleged pre-Clovis level resembles
a half a dozen later Archaic points found in the area.

 Here is my source of information -

https://www3.nationalgeographic.com/genographic/atlas.html

The map shows the edge of the Laurentide Ice Sheet
very close and I suppose the date is 18000-14000 BP.
(I find the map path routes vague and confusing.)

Would some knowledgeable sci.archer tighten up
on the exact picture with supporting evidence?  
snip

So he did the calculation. I don't think he or anyone else thought
that the pNAs went straight on through from Beringa to Monte Verde,
but the relatively short amount of time that would be needed to do the
job by sea was part of the demonstration. I get 100 degrees of travel,
60 miles to a degree equals 6000 miles. Four and a half years is
1642.5 days, ie 3.65 miles per each six hour day of travel or 6/10ths
of a mile per hour.

On May 15, 5:57 am, Jack Linthicum <jacklinthi... at (no spam) earthlink.net
wrote:

snip[

So he did the calculation. I don't think he or anyone else thought
that the pNAs went straight on through from Beringa to Monte Verde,
but the relatively short amount of time that would be needed to do the
job by sea was part of the demonstration. I get 100 degrees of travel,
60 miles to a degree equals 6000 miles. Four and a half years is
1642.5 days, ie 3.65 miles per each six hour day of travel or 6/10ths
of a mile per hour.

Those people migrated either through force of population growth or to
follow a food source.
None of that works at 3 miles a day
Most likely they would camp, clean out the local preferred food supply
then move on to repeat the same behaviour

A Canadian series of maps

http://ess.nrcan.gc.ca/ercc-rrcc/proj6/index_e.php
snip
one for the distribution of fluted points

http://home.comcast.net/~mfaught/continentalshelf/FltedPts_iceshelf_l...

On May 14, 5:55 am, Jack Linthicum <jacklinthi... at (no spam) earthlink.net
wrote:
snip

A Canadian series of maps

http://ess.nrcan.gc.ca/ercc-rrcc/proj6/index_e.php
snip
one for the distribution of fluted points

http://home.comcast.net/~mfaught/continentalshelf/FltedPts_iceshelf_l...

You will notice that the "fluted points" map does not display the
correct
ice margins for any time in the time span supposedly portrayed by the
map,
according to the (rather authoritative) Canadian source, i.e.
11,500 - 10,000 rcybp.
Also, I'm a little suspicious of that date range for the points,
although I could be wrong; that seems to be a little early, and
I wonder if "rcybp" (the lower-case lettering is unusual)
should have been "years ago".
I don't see how the other maps can help us re: this topic.

- Daryl Krupa

One other point, does anyone know if
the 100 meter lower sea level exposed
the tops of the Pratt-Welker seamount chain?

Daryl, do you know this site?
http://www.ifremer.fr/drogm_uk/Realisation/carto/Carto/index.html

On May 14, 5:55 am, Jack Linthicum <jacklinthi... at (no spam) earthlink.net
wrote:
snip

A Canadian series of maps

http://ess.nrcan.gc.ca/ercc-rrcc/proj6/index_e.php
snip
one for the distribution of fluted points

http://home.comcast.net/~mfaught/continentalshelf/FltedPts_iceshelf_l...

  You will notice that the "fluted points" map does not display the
correct
ice margins for any time in the time span supposedly portrayed by the
map,
according to the (rather authoritative) Canadian source, i.e.
11,500 - 10,000 rcybp.
  Also, I'm a little suspicious of that date range for the points,
although I could be wrong; that seems to be a little early, and
I wonder if "rcybp" (the lower-case lettering is unusual)
should have been "years ago".

   I don't see how the other maps can help us re: this topic.

- Daryl Krupa

You are taking the 3 miles literally, it is a number, an average,
users say that the umiak, the most probable boat used in such a
journey at least at first, can make an easy 50 miles a day.

On May 14, 5:05 pm, George <gbl... at (no spam) hnpl.net> wrote:
On May 15, 5:57 am, Jack Linthicum <jacklinthi... at (no spam) earthlink.net
wrote:

snip[

So he did the calculation. I don't think he or anyone else thought
that the pNAs went straight on through from Beringa to Monte Verde,
but the relatively short amount of time that would be needed to do the
job by sea was part of the demonstration. I get 100 degrees of travel,
60 miles to a degree equals 6000 miles. Four and a half years is
1642.5 days, ie 3.65 miles per each six hour day of travel or 6/10ths
of a mile per hour.

Those people migrated either through force of population growth or to
follow a food source.
None of that works at 3 miles a day
Most likely they would camp, clean out the local preferred food supply
then move on to repeat the same behaviour

You are taking the 3 miles literally, it is a number, an average,
users say that the umiak, the most probable boat used in such a
journey at least at first, can make an easy 50 miles a day. The
numbers I have seen for that are from Greenland and Labrador, but I
can assume the same people with the same technology would obtain the
same numbers. Probably leg would be something like 100-200 miles and
a suitable fishing and seaweed collecting site. These people lived
from the sea, probably did not start hunting until they had settled in
a place.

On May 14, 5:55 am, Jack Linthicum <jacklinthi... at (no spam) earthlink.net
wrote:
snip
A Canadian series of maps

http://ess.nrcan.gc.ca/ercc-rrcc/proj6/index_e.php
snip
one for the distribution of fluted points

http://home.comcast.net/~mfaught/continentalshelf/FltedPts_iceshelf_l...

You will notice that the "fluted points" map does not display the
correct
ice margins for any time in the time span supposedly portrayed by the
map,
according to the (rather authoritative) Canadian source, i.e.
11,500 - 10,000 rcybp.
Also, I'm a little suspicious of that date range for the points,
although I could be wrong; that seems to be a little early, and
I wonder if "rcybp" (the lower-case lettering is unusual)
should have been "years ago".
I don't see how the other maps can help us re: this topic.

- Daryl Krupa

"rcybp" = radio carbon years before present?

On May 15, 9:49 am, Jack Linthicum <jacklinthi... at (no spam) earthlink.net

Nope.

People only move when there is pressure.
Either lack of food or population pressure pushing the smaller tribes
away from the good food sources.
Hunters follow prey.
If they prefer marine mammals as a food source they will follow those
prey animals along the coast and achieve the same result as your
quoted umiak.
Far more probable than using a boat type that has little history
beyond 4000 years