Seriation stratigraphy and index fossils the backbone of archaeological dating Viscacha porn star
Petrie was a scientific archaeologist, probably close to our first example.
The seriation method works because object styles change over time; they always have and always will.
You might find a small number of 78s for a long period after they were pretty much done.
Archaeologists call this kind of behavior "curation" -- people then, just like today, like to hang on to old things.
Petrie's notions about Egyptology, and archaeology in general, were revolutionary.
His worrying about where a pot came from and what period it dated to and what that meant to the other objects buried with it were light-years away from the ideas represented in this photo dated to 1800, in which "Egyptian pots" was considered enough information for the thinking man.
Using seriation at our hypothetical junkyard sites, we will try to establish the chronology--the order in which the junkyards were used and closed.
A good example of a change in artifact type is the development of hand-held PDAs from those first enormous cell phones. As an example of how change through time works, consider the different music recording methods that were used in the 20th century.