TWIN FALLS — Shawn Willsey — the author of “Geology Underfoot,” in which he explores 23 southern Idaho sites —will hold a book signing from 2 to 4 p.m. Saturday at the Herrett Center on North College Road.

For more information on Willsey’s book, see a previous Times-News story at: http://magicvalley.com/lifestyles/recreation/new-geology-underfoot-book-explores-southern-idaho-sites/article_08924550-56a3-5976-8b70-07484bfe827b.html.

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