DISCOIDAL &
COGGED STONES
7,500 TO 5,000 YEARS AGO

LOS ANGELES COUNTY, CALIFORNIA
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COPYRIGHT DECEMBER 31, 2011 PETER A. BOSTROM

     This picture shows 17 discoid stones that were collected by Horatio Rust in 1897 on a road grading construction project in Pasadena, California. Most of them relate to cogged stone types of artifacts, even the ungrooved examples.
    Researchers have reported at least seven different types of cogged stones which have physical descriptive names such as, beveled, land and grooved, intermediate, fish vertebra, seastar, truncated and ovoid. One type is referred to as a "jelly mold" which looks like a cut off end of a cactus stem. Cogged stones range in size from 1 to 6 inches in diameter and their notches vary from 1 to 20 with most having between 8 and 13 notches. Most examples have their notches fairly evenly spaced.

17 discoid stones from Southern California.

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