Quote Originally Posted by Barb T. View Post
It's actually a fold in the bedrock that's a several kilometers long. The white oval is actually a layer of light colored limestone that's shaped kind of like a double dog bowl. Only the edge is exposed - most of it is underground

our primary data source is Google Earth. We're actually using Google Earth images in the field as base maps, because it's the best resolution imagery available. Amazing!
You aren't thinking that these might be meteorite impact craters are you? I saw a Smithsonian special on one in the Sahara with a lot of buff-green glass about. I would have thought you only produced glass when you impacted sand, not when you had limestone, so I suppose my comment isn't a totally ridiculous speculation.

Aren't the Google Earth images just LANDSAT or related imagery anyway? My brother-in-law is a LANDSAT interpreter for the Amazonian region for IMPE in Brazil.

To ensure that something kilted enters this - so what makes Rex's tartan design so successful, Barb? Rex, want to share it with us? A newbie post led me to Scotsweb design, and I began to work on the MacBean tartan a bit, turning the modern into the ancient for a start, thinking about what pleats well to the stripe and flashes nicely when moving.