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Originally posted by Byrd
There's a lot of things on the Google Earth Anomalies that are "things people are unfamiliar with" -- for example, there's a very nice picture of a tidal bore labeled as a "line."
They're quite common. I am skeptical of the "fish weir" identification, personally -- it seems to be in the wrong place and facing the wrong direction.
A few of the images are very old earthquake fault zones. One of the UK samples appears to be a dredge zone.
If you find an "anomaly", the first thing to do is look at maps -- modern maps as well as older maps of the area. Geological maps of the areas will tell you if you've got an escarpment or fault lines (often described as "anomalies.") Knowing where the edges of the stone beds are will also show you if an "anomaly" is just a ridge of harder stone where grass and trees don't grow well.
Volcanic dikes are also commonly identified as "anomalies." These are cracks in the earth filled by lava from ancient volcanoes.
In the case of Yucutan, a bit of research on old roads will help. Some of the features can be walls and fencelines.
It's fun to look for oddities in maps.
You might check in with the Google Earth forums and ask people who live near those areas to comment on them. You can find some surprising stuff!