I apologize for taking a long time to respond. There were some project deadlines that needed my full attention.
Sites form, and are destroyed, by both natural and cultural processes.
Hence, sites are usually selected for their strategic locations and are settled, occupied, defended, concurred, burned and destroyed, rebuild, expanded in size, etc. Hence, humans clean up, remove and reuse, and often level off remains from older earlier, settlements only to build on top of them, especially when available space is a limiting factor, or other benefits mandate the occupation of a specific site or location. It is therefore that Archaeologists under all circumstances employ a comprehensive cross-disciplinary control and detailed documentation of their procedures based on strict and methodical protocols of operation, before, during, and after the in the field activities.