22249
The area 's geology has little variety , comprising almost entirely of Eocene clays which , prior to urbanisation , supported a heathland environment .
 location: Eocene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Eocene 
Answer:
 location: Eocene