Industrial mineral site no. 151, known as "Gail Sigford (Paul Kirsten) pottery" is a site in Pierce County, Washington.
This site has been associated with common clays and shales. A notation found in DGER Bulletin 37 on page 20 says "Recent
soft. plastic bluish clay", and designates the value as "Formerly used in making garden and novelty ware by Paul
Kirsten. Recently used for the same purpose by Miss Gail Sigford".