I think Farmboy has made a similar discovery and he was commiserating!
It does no good to challenge some theories, because there are just too many willfully blind people out there. Besides that, we moved when I was about 12. Haven't been back since, but the farm is still there. Given about five minutes and weather warm enough for wading, I could have you walking in those prints. I do remember they were small, both the human and equine. My feet fit well in the prints, they weren't much bigger than mine-of course they could have been a child's prints. :) The equine tracks weren't much bigger than those of my pony-probably why I noticed them in the first place. We had a huge pasture/woods and if my pony got a whiff of bridle, he was gone. I learned to track pretty well!
I disagree about it doing no good to challenge some theories though, sometimes just having the challenge on record is enough even if the challenge was not successful. It's a funny thing about evidence and facts, people may willfully ignore, marginalize, or falsely interpret them, but eventually someone will come along with an open mind and set the record straight.
You should report the rocks to the closest University. There are tons of cases of things found in University collections that weren't understood or purposely miscategorized when they were discovered which were later reinterpreted.