Erratic Rock State Natural Site, Geological state park in Willamette Valley, Oregon, United States.
This 40-ton argillite rock stands on a 250-foot hill, surrounded by vineyards and farmland with views of the Oregon Coast Range.
The rock traveled over 500 miles from Canada during the Ice Age floods between 12,000 to 17,000 years ago, carried by icebergs through Montana and Washington.
The site demonstrates the geological forces that shaped the Pacific Northwest landscape and represents a significant marker of prehistoric natural events.
Visitors can access the rock via a 0.2-mile paved trail starting from the parking area on SW Oldsville Road, off Oregon Route 18.
This glacial erratic, estimated to be 600 million years old, originated from the ancient sea floor and remains the largest of its kind in Willamette Valley.
Location: Oregon
Website: https://stateparks.oregon.gov/index.cfm?do=park.profile&parkId=96
GPS coordinates: 45.14010,-123.29300
Latest update: May 14, 2025 19:03
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