A Spiritual Experience

Hello. This is my first real post here and the reason I found this site in the first place. I'm looking for a little insight to an experience I had when I was 15. I'm 31 now. It was on a campground in Georgia where me and my siblings were visiting my Dad for the summer. I would reveal the name of the place but I don't want anyone messing around there disturbing things... My Dad lived on the campground though. And at the end of the campground was a little cove beside the highway where we fished at. While fishing one day, pilfering around in the dirt a piece of pottery was found. We then started digging around and discovered a bunch more pieces. Different shapes and designs. Nothing fancy, but nice looking pieces. Dad still has them framed up on his wall to this day. There is an outlet mall across the way with a display in the food court that we later used for reference for dating the pieces and such. But one day just before dusk after digging for these, just me and Dad that day, I had some sort of encounter. We had just gotten back to Dads camper and I was the first one inside. Dad was still doing something in his truck. I had just sat down, everything was very quiet. Then I heard a chant and drums come over my shoulder and into my right ear. Didn't hear it in my left ear, just my right. Felt like it was just for me. I also felt it in my heart. My literal heart. It only lasted like 5 seconds. It was kinda cliche like something you'd see in a movie or something. Idk what I had experienced. Still don't. I guess I tapped into some spirits by digging this stuff up. Idk if it was a good thing or bad thing. Or maybe just letting me know they were there. I dunno. That's what I'm trying to figure out. It was by far the craziest, most interesting thing that has ever happened to me!! Ever since then, I have been intrigued by Native Americans and other aboriginal peoples around the world. If anybody can let me know what I experienced, I would really appreciate it! Also, I'm thinking of returning the pieces in case we've disturbed something we shouldn't have. It wasn't ours to take in the first place. But I'll have to wait until I'm down that way again as I live in Virginia. Thank you.