This may be an interesting post for those that think they have the time to look for this stuff.
There was a mention of tool marks on these markers. I may show one, I may not , that changed my opinion long ago on that subject, one with a face profile with a pupil in an eye, with nose, lips, cheek bones, beard, hat etc, that has nothing that says it is worked as far as tool marks, other than obvious images from several sides that it is made to be a monument. An owl from one angle , a king's head from another, a face profile with ancient crown /hat from another.
But what I really wanted to focus on, is the fact that we are handicapped already to find this stuff. We are set up from society to not have any time for this stuff.
Take a normal family guy, holidays, birthdays, family vacation time from work, just a chance for a break, kid's sports, for the most part you really have no time to go after anything that is on this thread. Let's just look at weekends. The ones that don't fall on a birthdays or holidays, school sports, etc., you can try and plan for some sort of vacation, if you are fortunate enough to earn enough money, but they are few.
The only reason I have been able to get out, is that I value the time I can spend in the field , and will take any opportunity, such as a couple hours after work , or an odd day in the summer we aren't camping , boating, celebrating Birthdays, holidays, to look for this stuff.
Don't get me wrong, I value my family time above all else. However, it has come to a point where every single free day, is "booked out". There is no free time, we have no time to figure things out anymore, and we have to rely on the premise that it's all been done and there is nothing to see out there anymore. This is exactly the optimal way that this stuff is buried. Little time for people to spend in the field, so you can hide everything in plain sight. You walk right over it without a second thought on what's in front of you, because you never had the time to really look at anything.