Mima Mounds: Oregon
Mima Mounds are aligned in rows and seem to originate from the ancient rivers at this Oregon site that extends for a 20+ mile radius:
The mounds are between 30-60+ feet in diameter:
Another site 1.5 miles to the North contains the larger circles at 50-60+ feet in diameter:
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I am not so sure that these are pictures of Mima Mounds, as these mounds do not seem well separated or very round. There are other Mima Mounds in Oregon, such as along Highway 197 (south of Maupin), that seem to fit the descriptions of Mima Mounds better.
These are not mima mounds. This is patterned ground that looks like the many square miles of these features in the Oregon desert particularly near Flook Lake on the Hart Mountain Antelope Refuge.
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