This presentation on May 20, 2020 was made as part of Nature in Your Neighborhood, a six-part series of Zoom Lectures sponsored by the Jefferson Land Trust (add link here). It describes the general geologic history of the Quimper Peninsula during the latest Pleistocene (past 20,000 years) and Holocene (past 11, 500 years). It focuses on three themes:
- Glacial meltwater channels — Chimacum Valley
- The Bluffs Downtown
- Glacial Erratics with a special challenge
The presentation is about an hour long and features geologic interpretation of glacial deposits in the Port Townsend area. The challenge is one to discover the larger and largest glacial erratics in the area. See our tab on Resources for a List of Glacial Erratics and our Photo Gallery for Images of Glacial Erratics.
Michael Machette is an advisor to the Quimper Geological Society. He moved to Port Townsend, WA after a 35-year career as a Quaternary Geologist with the U.S. Geological Survey in Denver, CO. His areas of research evolved over this time period: from geologic mapper, to Cenozoic basin studies, Neogene tectonics, active faulting and probablistic seismic hazards analysis. Since relocating to the Quimper Peninsula, he has started to delve into the local geology, hence this lecture for the JLT Nature in Your Neighborhood series.