Thanks to ZacUK and Choucas, the following seems to be the correct coin:
Roman Provincial
Elagabalus 218-222 A.D.
Antioch in Seleucis and Pieria, Syria
AE
BMC vol. 20, p205, 451 to 456
Sear: Greek Imperial Coins p293, 3097.
o. AVT KAI MAP AVP ANTΩNεINOC Cε (note the ANT over the forehead)
bust r, laur.
r. ANTIOXεΩN MHT KO
City goddess seated l. on rock, holding ears of corn, river god Orontes swimming at feet; above, ram running l.; in field SC, Δε and star.
Image of a similar coin, BMC 461, is shown here:
http://www.wildwinds.com/coins/ric/elagabalus/_antioch_BMC_461.jpg