Sierra Club Sierra Talks – 7 Written in the Land: Indigenous Heritage in Southern California: The Imperial Valley and Southern California regions are rich in history. Over 10,000 years, there were a multitude of indigenous groups who called its mountains, deserts, and coastal shores home. The Kumeyaay, Cahuilla, Quechan, Cocopah, and Pai Pai were, and still are, masters of their environments. Their artifacts, tools, artwork, and villages tell a collective story of adaptation, understanding, and ingenuity in a land of extremes. David Breeckner PhD, is the Executive Director of the Imperial Valley Desert Museum, located in the heart of the Yuha Desert in Ocotillo, California. He will share the evidence of stories still visible today.