Glass Mountain obsidian flow at Medicine Lake volcano, California. Glass Mountain is a spectacular, nearly treeless, steep-sided rhyolite and dacite obsidian flow that erupted just outside the eastern caldera rim and flowed down the steep eastern flank of Medicine Lake volcano.
Julie Donnelly-Nolan, PhD
Julie Donnelly-Nolan is a research geologist at the U. S. Geological Survey in Menlo Park CA. She does field mapping of volcanoes and collaborates with argon chronologists, paleomagnetists, and petrologists in order to understand potential hazards presented by the volcanoes.
She has spent two decades doing detailed geologic mapping at Newberry Volcano with the goal of unraveling its history and understanding its potential hazards. She also worked for many years at Medicine Lake volcano in N. CA (https://pubs.usgs.gov/sim/2927/). Prior to that she did her U.C. Berkeley PhD thesis on the Clear Lake Volcanic Field in the CA Coast Ranges.
Science and Products
Glass Mountain obsidian flow at Medicine Lake volcano, CA.
Glass Mountain obsidian flow at Medicine Lake volcano, California. Glass Mountain is a spectacular, nearly treeless, steep-sided rhyolite and dacite obsidian flow that erupted just outside the eastern caldera rim and flowed down the steep eastern flank of Medicine Lake volcano.
Mount Konocti viewed from Cinder Cone, Clear Lake Volcanic Field.
Mount Konocti, the most distinct volcanic feature of the Clear Lake Volcanics as viewed to the west from Cinder Cone.
Mount Konocti, the most distinct volcanic feature of the Clear Lake Volcanics as viewed to the west from Cinder Cone.
Science and Products
- Data
- Maps
- Publications
- News
- Multimedia
Glass Mountain obsidian flow at Medicine Lake volcano, CA.
Glass Mountain obsidian flow at Medicine Lake volcano, California. Glass Mountain is a spectacular, nearly treeless, steep-sided rhyolite and dacite obsidian flow that erupted just outside the eastern caldera rim and flowed down the steep eastern flank of Medicine Lake volcano.
Glass Mountain obsidian flow at Medicine Lake volcano, California. Glass Mountain is a spectacular, nearly treeless, steep-sided rhyolite and dacite obsidian flow that erupted just outside the eastern caldera rim and flowed down the steep eastern flank of Medicine Lake volcano.
Mount Konocti viewed from Cinder Cone, Clear Lake Volcanic Field.Mount Konocti, the most distinct volcanic feature of the Clear Lake Volcanics as viewed to the west from Cinder Cone.
Mount Konocti, the most distinct volcanic feature of the Clear Lake Volcanics as viewed to the west from Cinder Cone.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government