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The information offered here is additional updated material gathered before Hughes (1988a) study.

Red Hill source material does not often appear in archaeological context in central and southern Arizona probably due to intervening sources in eastern and central Arizona (Shackley 1986a).

The two sources reported here have been discussed in detail in Shackley (1994c). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.

Obsidian Butte glass has been analyzed quantitatively by Ericson (1977) and Hughes (1986) elsewhere and will not be reported here. All materials appearing on this Web ( may not be reproduced or stored in a retrieval system without prior written permission of the publisher, except for educational purposes, and in no case for profit.

My analyses of Obsidian Butte source standards and archaeological obsidian from the region are comparable (i.e.

One of the more striking developments in obsidian studies in this area of the Southwest is related to the problem of understanding the secondary deposition of obsidian from some of the large Tertiary sources, and the discovery of significant geochemical variability in what was originally known as the Mule Creek source (Shackley 1992a).

In the first case, Mule Creek and Cow Canyon marekanites were found to be eroding into the San Francisco and Gila Rivers at least 50 km and possibly 100 km from the primary sources.

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