They are everywhere....but not quite

The other day I wrote about how there are rock piles everywhere, seen out the car window as we drove through 5 states. But the sixth one, New Jersey, had zero rock piles, in the part that we cut through briefly. Here is what you get instead:

We used to call those "corner bulges".

As to the ubiquity of rock piles east of the Hudson River, American archaeologists are not going to want to find out about it. For one thing, they are going to have an immense amount of work to do. For another, they are not going to be able to document things anywhere near thoroughly. There is just too much data, when new sites appear behind every bush (so to speak). What!? Are they supposed to examine every back yard in New England? Try driving around Woodbridge CT, or even Cahoonzie NY. Yep, the rock piles are so numerous they spill out of the woods onto people's lawns:

Trying a little harder to make this point: Suppose they had to bury their dead inside an individual  mound. How many people died in the last -say- four thousand years? Shouldn't their graves, blanket the countryside?