Re:Sprawling Mayan network discovered under Guatemala jungle
by maxerickson on Friday February 02, 2018 @02:53PM
(#16293688)
Archaeologists have characterized various layers, the depth and thickness will vary.
So a layer there might just consist of evidence of some particular activity that one settlement engaged in that earlier and later ones did not.
[1]https://en.wikipedia.org/wiki/Troy#Historical_Troy_uncovered