STORY AND PHOTO BY KAREN BOSSICK

Learn about the complex rocks and landforms that form the Wood River Valley when the Sawtooth Botanical Garden offers a geology lecture and field trip this coming weekend.

Link, a geosciences professor at Idaho State University, will give an illustrated talk at 7 p.m. Friday, June 22, at the Sawtooth Botanical Garden four miles south of Ketchum at Highway 75 and Gimlet Road. He will discuss the valley’s granite, and sedimentary rocks, its lava flows and core complexes and even a nearby caldera.

Cost for the lecture is $10 for SBG members and $12 for nonmembers. Preregistration is recommended at www.sbgarden.org or 208-726-9358.

On Saturday Link will lead an all-day exploration of the valley’s geology and the ways it influences native plants, garden soils, mining, earthquakes and floods. The terrain will be easy to moderately difficult.

Participants should meet at 8:30 a.m. at the garden to carpool and plan to return by 3 p.m. Cost is $10 for members and $12 for nonmembers with preregistration recommended.

Those who participate in both the talk and field trip will get a discount with the cost being $18 for SBG members and $22 for nonmembers.