[OR_Archaeology] PSU Archaeology First Thursday, January 7th, 4 p.m.

[Wendy Ann Wright]

The Anthropology Department and Anthropology Student Association at Portland
State University presents the January 2010 *Archaeology First Thursday
Lecture*:

Come hear about *"Obsidian Studies at the Beech Creek Site"* from Cheryl
Mack, archaeologist for the Gifford Pinchot National Forest.

Everyone who attends the lecture will also receive a raffle ticket for a
chance to win a copy of a recent archaeological publication.

Please join us *Thursday, January 7th* at *4 p.m.* in *Room 294* of PSU's
*Smith Memorial Student Union *(1825 SW Broadway, 97201)

The Beech Creek Site (45LE415) in the upper Cowlitz River valley was
occupied throughout the greater part of the Holocene, and offers a unique
opportunity to observe changes in site use over time.  A relatively large
sample of obsidian (111 specimens) from the site was submitted for X-ray
fluorescence analysis and hydration analysis.  Hydration rim values were
useful in assessing depositional integrity and in establishing a relative
chronology of occupation.  Combined, the results of X-ray fluorescence  and
hydration analysis offer insights into both the social network of the site's
inhabitants, and how that network changed through time.  Although most of
the obsidian recovered at the site originated from the nearby Elk Pass
source in the Washington Cascades, a number of sources in central and
eastern Oregon were represented in the site's assemblage.  Based on
hydration rim values, it appears that sources in eastern Oregon were being
used at the earliest period of the site's occupancey, followd later by
sources in central Oregon and Washington.

For more information please call 503.725.3081or email
wendyannwright at gmail.com
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