What did the Sarcophagus of Symmachus look like?

This book concerns the chronology of Roman mythological sarcophagi. The traditional chronology assumes a peak in production during the reign of Gallienus (AD 259-268) that fades away in the reign of Constantine. This chronology has some obvious flaws. The supposed peak under the reign of Gallienus, when the empire was falling apart, can only be described as a mirage. Some very fine sarcophagi were indeed produced in this period, but the number is very limited. With the reign of Constantine (AD 3