[Grovenet] Obsidian: History through the Volcanic Glass Window 1/8/08, 7 PM

[Alana Graham]

On Tuesday, Jan. 8, at 7 pm in the Rogers Room of the
FG City Library Dennis Jenkins of the UO Museum of
Natural and Cultural History will present his program
Obsidian: History through the Volcanic Glass Window. 
The program is sponsored by the Friends of the FG
Library and the Oregon Council for the Humanities.  It
is free and open to the public.  

“Flows of obsidian, a natural glass produced by many
volcanoes in Oregon , contain a unique chemical
signature than enables archaeologists to trace
artifacts back to the volcano of origin.  Obsidian is
also an unstable mineral that begins absorbing
molecular water soon after a fresh surface is exposed
to the atmosphere, a process that produces a
“hydration clock” that tells the age of each artifact
and flake.

Obsidian artifacts yield a treasure trove of
information about prehistoric lifeways and the
development of sociopolitical areas in central Oregon
across fifteen thousand years of prehistory. 
Archaeologist Dennis Jenkins presents a fascinating
look at the trail of information left by this
beautiful volcanic glass.” (OCH Oregon Chautauqua
2007-08 Catalog)

Thanks
Alana


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