You are spot on the money.
There are layers and layers of figures, portraits, artwork, saturating the area. And what could one expect over 8000 years, when much of the artwork loses its meaning, or not seen due to its size, or muddied over in floods, or even worse, when a new culture makes a point of obliterating the past culture's work.
Every backyard has something. Can I show a glyphic Star of David vegetation piece, 1 mile from Avebury center, and where would I put it? Can I put it under the Silbury image section for starters?
Every 50 feet shows some piece of antiquity undersoil, and now viewable with the new sat and photo softwares. There is not one story about Silbury, 1000 stories about Silbury alone, I am sure, and they are all plausibly true, I believe.