CM has written a list of periods for us to use to render the data more specific. I'll be adding a field or three to the DB in order to accommodate this info.
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Option 1 PREFERRED

Greek Timeline
8300-7000 BC Mesolithic Period
7000-3000 BC Neolithic Period
3000-2000 BC Early Bronze Age*
2000-1500BC Middle Bronze Age*
1550-1100 BC Late Bronze Age*
1100-850 BC Dark Age
850-700 BC Geometric Greece
700-600 BC Orientalizing Period
600-480 BC Archaic Greece
480-450 BC Period of Transition
450-400 BC High Classical Period
400-300 BC Fourth Century
323-31 BC Hellenistic Period

Roman Timeline
1000-700 BC Villanovan
700-500 BC Early Etruscan
500-300 Etruscan
509-27 BC Roman Republic
27 BC-14 AD Augustus
14-68 AD Julio-Claudians
68-98 AD Flavians
98-117 AD Trajan
117-138 AD Hadrian
138-193 AD Antonines
193-235 AD Severans
235-284 AD Soldier Emperors
284-312 AD Tetrarchs
307-337 AD Constantine
337-379 AD House of Constantine
379-393 AD Theodosius

*Bronze Age Break Down:

Crete, Minoan Timeline
3000-2500 EMI
2500-2200 EMII
2200-2000 EMIII
2000-1700 MMI
1900-1700 MMII*
1700-1550 MMIII
1550-1500 LMIA
1500-1450 LMIB
1450-1400 LMII*
1400-1300 LMIIIA
1300-1200 LMIIIB
1200-1100 LMIIIC
Note: MMII was only at Knossos and Phaistos; LMII was only at Knossos

Cyclades, Cycladic Timeline
3000-2500 ECI
2500-2200 ECII
2200-2000 ECIII
2000-1850 MCI
1850-1700 MCII
1700-1550 MCIII
1550-1100 LC

Greece, Helladic Timeline
3000-2500 EHI
2500-2200 EHII
2200-2000 EHIII
2000-1550 MH
1550-1500 LHI
1500-1400 LHII
1400-1300 LHIIIA
1300-1200 LHIIIB
1200-1100 LHIIIC
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Optional, simplified version

Greek Timeline
7000-3000 BC Neolithic
3000-1100 BC Bronze Age
1100-700 BC Dark Age
700-480 BC Archaic Greece
480-323 BC Classical Period
323-31 BC Hellenistic Period

Roman Timeline
1000-300 BC Etruscan
509-27 BC Roman Republic
27 BC-14 AD Augustus
14-117 AD Early Empire
117-284 AD Middle Empire
284-393 AD Late Empire