tag:blogger.com,1999:blog-6865007.post5106830390618929821..comments2023-11-05T00:59:10.828-07:00Comments on decorabilia: Mima Mounds: mystery solved?Jim Andersonhttp://www.blogger.com/profile/09928624189124041120noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6865007.post-72875390717302172102012-02-23T15:34:08.345-08:002012-02-23T15:34:08.345-08:00Absolutely agree with Lloyd. Will this be forever ...Absolutely agree with Lloyd. Will this be forever a mystery?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6865007.post-24330628766825215692009-10-15T19:24:07.484-07:002009-10-15T19:24:07.484-07:00This is a great theory for areas adjacent to a gla...This is a great theory for areas adjacent to a glacial front, but "mima mounds" are found in several areas of the Columbia Gorge, often atop highly elevated benches (notably at Tom McCall Preserve, Rowena, OR). The Tom McCall Preserve plateau sits 500' above the Columbia River and was likely overtopped by several Bretz Flood events. However, it's difficult to impossible to imagine those roaring torrents freezing, then sun-cupping and accumulating gravel deposits that invert as the ice melts away. Erosional features, gopher constructs or other hypotheses may seem unlikely, but the inverted outwash mounds hypothesis is even more unlikely.Lloyd DeKayhttps://www.blogger.com/profile/13730235206233042434noreply@blogger.com