I really admire this visual from Brackendorf 1998: 491 as a means of explaining how we assume coin types will be represented in hoards over time.
See Comments for Fuller Refs.
Thinking about Coins in Hoards
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adventures in my head
Liv Mariah Yarrow 
A very interesting and informative chart. I tried to google “Brackendorf 1998” but I didn’t find anything. Can you be more specific where I can find this? Thank you very much.
Of course! Sorry! (I forget sometimes people actually read my blog rather than myself) AND there was a typo in his name: http://www.worldcat.org/oclc/925123755 Buttrey gave it a major review: http://www.worldcat.org/oclc/5884367872 and p.543-563 are thorough summary of the work in Italian thanks to Silva Riccardi.