1239
It was formerly believed that these two sites were two separate craters and that they formed a twin impact structure from the Late Cretaceous .
 location: Late; location: Cretaceous
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Late; location: Cretaceous