Monday, January 23, 2006
Petroglyphs 1: Human figure
These are from Deer Valley, north of Phoenix. There are reported to be about 1500 different images on these rocks. The images are almost all created by hammering away the desert varnish to expose the light-colored stone underneath. By measuring how much varnish has accumulated since the image was created, scientists can do both relative dating (more varnish is older) and a guestimate at total age (at least a thousand years plus, for the oldest).
The site is sacred to several current tribes and the park is designed to limit access and vandalism while allowing education.
These are from Deer Valley, north of Phoenix. There are reported to be about 1500 different images on these rocks. The images are almost all created by hammering away the desert varnish to expose the light-colored stone underneath. By measuring how much varnish has accumulated since the image was created, scientists can do both relative dating (more varnish is older) and a guestimate at total age (at least a thousand years plus, for the oldest).
The site is sacred to several current tribes and the park is designed to limit access and vandalism while allowing education.
Saturday, January 21, 2006
Intro
This will be a place where I can put up a picture or six and share them with my friends, I hope.
Welcome!
Welcome!
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