On Thur., July 25, Dr. Daniele Mckay, geologist and adjunct instructor in the Dept. of Earth Sciences at the Univ. of Oregon, will give a presentation on recent geologic research that has changed our understanding of Central Oregon landscapes. The presentation will take place at the Sunriver Nature Center's Pozzi Education Building from 6:30 to 8:00 pm. Registration is $10. per person and is free for SROA members. Register online at www.snco.org/geology or call 541-593-4394.