I worked in WY for a few years for the US gov't. Others who have responded are correct that these features are remnants of resource development. Specifically, many of the regularly spaced round features are what is left after an exploration company does what is called a "2D or 3D seismic survey". The difference between the two is that the 3D gives a more complete view of underground features. When you see a bunch of "dots" in a row, it was a 2D survey, when there is a grid, it was a 3D. And a previous poster was right, the actual holes are called "shot holes." That is when a sonic vibration (a small explosion) is sent into the ground and equipment on the surface records the vibration off of different densities of rock/soil in the ground.
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