[BwanaNdege]

The other option one paper mentioned is that these are half-Graben formations which have been weathered over millions of years. However, for these to occur over such an enormous area is mind-boggling, though not as mind boggling as the idea that these formations were created buy some ancient agriculturalists of aquaculturists.

I'd love to ask Caterpillar to determine the amount of earth which has been displaced in these formations, then to calculate how many D-9 Cats & self-loading Pans would be required working "X" number of years to complete this project.

Just the total area covered, the minimal elevation change over that area and the regularity of spacing & azimuth is absolutely astounding!

Perhaps an interstellar version of a combination of these two? /S

[cripplecreek]

Isle Royale in Lake Superior is made of parallel ridges and valleys. It sits on the edge of an ancient rift valley.