30045
The oldest known fossils of most of the modern mammal orders appear within a brief period during the early Eocene .
 location: early 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: early Eocene 
Answer:
 location: early Eocene