<Table> Ancient Agora of Athens <Tr> <Td_colspan="2"> Αρχαία Αγορά της Αθήνας </Td> </Tr> <Tr> <Td_colspan="2"> Central Athens </Td> </Tr> <Tr> <Th> Alternate name </Th> <Td> Forum of Athens </Td> </Tr> <Tr> <Th> Location </Th> <Td> Greece </Td> </Tr> <Tr> <Th> Region </Th> <Td> Attica </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 37 ° 58 ′ 30" N 23 ° 43 ′ 21" E ﻿ / ﻿ 37.97500 ° N 23.72250 ° E ﻿ / 37.97500; 23.72250 </Td> </Tr> <Tr> <Th_colspan="2"> History </Th> </Tr> <Tr> <Th> Material </Th> <Td> Marble </Td> </Tr> <Tr> <Th> Founded </Th> <Td> 6th century BC </Td> </Tr> <Tr> <Th> Periods </Th> <Td> Classical era </Td> </Tr> <Tr> <Th> Cultures </Th> <Td> Ancient Greece </Td> </Tr> <Tr> <Th_colspan="2"> Site notes </Th> </Tr> <Tr> <Th> Excavation dates </Th> <Td> 1931 until today </Td> </Tr> <Tr> <Th> Archaeologists </Th> <Td> American School of Classical Studies at Athens </Td> </Tr> <Tr> <Th> Condition </Th> <Td> Ruined </Td> </Tr> <Tr> <Th> Ownership </Th> <Td> Public property </Td> </Tr> <Tr> <Th> Management </Th> <Td> Minister for Culture </Td> </Tr> <Tr> <Th> Public access </Th> <Td> Yes </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Αρχαία Αγορά της Αθήνας </Td> </Tr>

What is the athenian agora made out of