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Signals of this kind are often used by chemists studying natural environments.

A hydrocarbon found in beach sediments, for example, might derive from an oil spill or from waxes produced by plants.

Archaeologists call this kind of behavior "curation" -- people then, just like today, like to hang on to old things.

But you would never have any 78s in junkyards closed before they were invented.

You would expect a large number in one closed when 78s were popular and a small number again after 78s were replaced by a different technology.

You might find a small number of 78s for a long period after they were pretty much done.

Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented (most likely) by the Egyptologist Sir William Flinders Petrie in the late 19th century.

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