Archaeologists' Mantra Not Applicable to Coins

One of the mantras one hears from the archaeological community is that an artifact without context is worthless from a scholarly perspective.  It's refreshing then to hear from archaeologists that the iconography of coins does indeed give them quite a bit of meaning.  See http://coinarchaeology.blogspot.com/2012/04/call-for-papers-art-in-round-new.html