The provided source material does not contain information regarding a city named Hexing in the Chongqing region of China. Instead, the available data identifies Hexing as an extinct genus of basal ornithomimosaurian dinosaur from the Early Cretaceous period in northeastern China.
Because the source material pertains exclusively to a prehistoric dinosaur and contains no geographical or municipal data, no information regarding a city in Chongqing can be provided based on the referenced text.