Have you looked anything up on line? Have you gone to the library? The local offices for land ownership/property/deeds- archives? None of us are there on your site with you, and like Gator said, I wish I were there to take over, but this is your bag. A surface hunt is not a dig. A probe will help you find things that are not on the surface of the ground.
THINK about what you're doing and trying to achieve- what you're trying to find. Do you own a metal detector? Have you tried using it anywhere near these spots? Have you figured out which way is south- and not just 'right'? Is there a place that's particularly pretty? Where people would enjoy hanging out as in family gathering or whatnot? Is there a pre-dominantly downwind place? (that would be a good location for a privy). Often lilacs are planted near privies too.
It's one thing to got for a walk in the woods and poke around. I do a lot of that, and I enjoy it! I walk along rivers and up and down mountains- all sorts of places. But non of those activities is a dig. And I would hesitate to post my ramblings on anything other than a personal blog.
I'm fully aware that I'm probably coming off as a little harsh, but the fact is, you really need to help yourself more. Spoon-feeding you information about how to search a site, the history of your area, etc., etc., isn't going to help you understand anything. I don't know if you picked up on any of the frustration here (maybe I only speak for myself), but again, the fact is, you're acting like a kid who hasn't studied for an exam- and then wondering why they got a bad grade. You need to do your homework.

There are so many resources on line- really. I suspect what you need to know is not in the form of an 'App'. So use a computer and look up all the words people here have suggested to you.

Take notes. Learn things. Take that knowledge with you to your site(s) and apply it. If and when you do this, we're all going to be here to cheer you on and offer advice, but the first step in really understanding your spot- your rock piles- is up to you.
From the bottom of my heart, I wish you the very best of luck. I'm looking forward to seeing some posts and some still pictures of your progress. Now get to work!

Yakker