[wildbill]

Probably animal pens. Very similar to the ones seen in Mexico and older S. Texas where stones are plentiful.

[mad_as_he$$]

At the link is a stone corral in Northern Nevada. It is about 150 years old.

https://earth.google.com/web/search/stone+corral/@40.84993327,-119.82735344,1705.40850025a,80.63859397d,35y,73.47340029h,44.97462377t,-0r/data=CncaTRJHCiUweDgwOWUxOGRkODgyZTIyYzc6MHhmODk1ZGYzODdjNTAxZDY3GUeovpjSbERAIVlZkYf09F3AKgxzdG9uZSBjb3JyYWwYASABIiYKJAmECnLk9DpEQBFaLj01oDlEQBlzTX56xa9dwCEYTx8WgbFdwA

Note it is barley discernible and has deteriorated a lot in the 25 years that I have been traveling past it. Just a reference point.