This is so interesting Matt. Thanks for putting this up. Last time I came by you started telling me about these stone piles around your place, but this is cool and helps me to understand what you were talking about.See you later,Sasha (Chermayeff)
The second photo in the series looks like a platform cairn, which I've been studying for the past fourteen years. If built on a steep slope, the lower portion is usually quite high, sometimes 6 feet or more, but if constructed on level ground, the feature would not be much than 3 feet high.