Touchet Formation, Geological formation in south-central Washington, United States.
The Touchet Formation displays layers of sediment deposits reaching depths of 330 feet, with distinct rhythmites of coarse sand and fine silt materials.
Richard Foster Flint first documented this formation in 1938 at the meeting point of Touchet River and Walla Walla River in Washington State.
The formation provides educational opportunities for geology students to study sedimentary processes and flooding patterns through field observations and research activities.
Researchers access the formation through multiple locations, including the Gardena Terrace segment along the highway west of Walla Walla and various tributaries.
The formation contains between 40 and 62 separate rhythmites, each marking individual flood events from Glacial Lake Missoula between 18,400 and 15,700 years ago.
Location: Washington
GPS coordinates: 46.03310,-118.68400
Latest update: March 17, 2025 08:35
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