Yes, those Mima mounds are very interesting and are similar to the mounds North of Mount Shasta. thanks for posting the link!

Mound Formations Near Mt. Shasta, California They appear to be the same size as those in the Modoc National forest and that's the reason I posted the Modoc circles since they do appear to be similar to the Shasta unexplained mounds.

There are more of these strange mounds near Serpent Mound in Ohio on the same page above.

If you are interested, sign up for the Yahoo Group and you will be sent an e-mail each time the site is updated. I plan on posting those Shasta circles at the site for future reference and I will include more images.

Thanks for that link, very interesting. The mounds near Mt. Shasta are near a rest stop and I was told by someone who has seen them that they are considered unexplained and there is a sign near the mounds that explains this. However, the person who contacted me about them said there seemed to be a wall like feature around each one of them which did suggest artificiality.