Dick Hilton, professor of geology at Sierra College will talk about the geology of the Sierra Nevada at the The Nevada County Gem & Mineral Society meeting, slated for 7 p.m. on Tuesday, April 2. The meeting will be at the Golden Empire Grange, 11363 Grange Court in Grass Valley, CA. General membership meetings are held at 7 p.m. on the first Tuesday of the month. Visitors always welcome. For more information, visit http://www.ncgms.org or call Lori Woodhall, president, at 530-432-1750.