OUTDOORS TOHONO CHUL PARK. 7366 N. Paseo del Norte. 742-6455. Tohono Chul Park grounds are open from 7 a.m. to sunset daily. Exhibit hours are 9:30 a.m. to 5 p.m. Monday through Saturday, 11 a.m. to 5 p.m. Sunday. Admission is $2. Enjoy a Walk in the Park tour at 9 a.m. Tuesday, Thursday and Saturday, and 1 p.m. Sunday. Tours depart at 8 a.m. Monday, Wednesday, Friday and Saturday. Art in the Park tours, docent-guided looks at gallery exhibits, are at 11 a.m. Tuesday and Thursday and 2 p.m. Sunday. Call 742-6455 for program information. Find out how you can protect both yourself and Arizona's black bears with Paul Larson and the Arizona Bear Coalition at 7 p.m. Tuesday, October 8. This discussion will teach about bear habits and habitats, bear etiquette and what's being done to keep Mt. Lemmon's bears safe and free. Reservations are required. SHELLING OUT. Arizona State Museum, UA campus inside the main gate at University Boulevard and Park Avenue. Learn the different ways Prehistoric Native Americans of the Southwest used marine shells from distant sources to fashion ornaments and other objects in a three-class series led by Arthur Vokes, curator of archaeological collections at the Arizona Sate Museum. Classes meet from 7 to 9 p.m. Thursday October 8, 15 and 22. Class format will include lecture, slides and examination of shell artifacts in the collections of the Arizona State Museum. Cost is $35, $25 for AAHS members. Call Jan Bell at 326-6709 for registration and information. SUMMIT ADVENTURE. Summit Hut. 5045 E. Speedway. 325-1554. Join John Dell for a free slide lecture entitled Hiking the Volcanoes--the Cascade Range 8 p.m. Tuesday, October 8. Call 325-1554 for information.

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