even SUNDAY 20120722 moving on?
^
http://4.bp.blogspot.com/-WX2o6PEn4Vs/UAxhsbC0S5I/AAAAAAAAAMg/cYt8zI-yd_g/s600/120719cp.JPG ^
Tools TI-31 TI-1 at Netarts Bay (Newman 1959), {forwarded from 2005 file
case study of site 35-TI-31 35-TI-31, The Wilson Beach Site
Using the standard typologies employed in northwest Oregon (Pettigrew 1977; Toep
el 1985), both the corner-notched and contracting stem points fall into the cate
gory of broad-necked projectile points. The third projectile point (TI-31-5) al
so likely falls into this category. Broad-necked projectile points dominate oth
er northern Oregon coast assemblages dating prior to about 1000 BP (Bennett and
Lyman 1991:257; Clark 1991:203; Connolly 1992:61; Minor 1991a; Pettigrew 1977).
Narrow-necked projectile points are much more abundant after 1000 BP and domina
te the two excavated assemblages from Netarts Bay (Newman 1959; Zontek 1978). O
ther tools from the site are less helpful in assigning an age to the site. Stem
med-scrapers, for example, are present in the Burkholder collection (Minor 1984:
9), which possibly dates prior to 6000 BP, and in the 35-TI-1 collection, which
is less than 600 years old.
Message 4621 "SCI.GEO.GEOLOGY"
Date: 01/24/2001 08:09
From:
earthscibbs@home.comTo: All
Subj: Re: Eocene ash layers
From: David Ramalho <
earthscibbs@home.com>
Organization: *** EarthSci BBS ***
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Subject: Re: Eocene ash layers
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Date: Wed, 24 Jan 2001 16:09:13 GMT
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Joe Rat wrote:
>
> On most well logs in Denmark and North Germany one can see
> ash layers. These correlate with the thick layers visible on
> the Danish island of Fur. The layers thin out southwards.
> As these are contiguous with the Moler formation these
> should be Eocene. This suggests a centre of Eocene
> volcanic activity north of Helgoland. Has this ever been
> pinpointed? Are there any Isopach maps of this ash layer?
Good morning
Here are a few items that may help.
AAPG Memoir 43, Evolution of the Arctic-North Atlantic and the
Western Tethys, by Peter A. Ziegler. p. 164-196.
http://www.searchanddiscovery.net/97020/memoir43.htm Iridium geochemistry of volcanic ash layers from the early Eocene rifting
of the northeastern North Atlantic and some other Phanerozoic events.
Authors: Schmitz, B.; Asaro, F.
GSA Bulletin Year: 1996 Volume: 108 Issue: 4 Pages: 489-504
Regards
David Ramalho
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