65939
Southwest of the Iapetus , a volcanic island arc evolved from the early Cambrian ( 540 " million years ago ) onward .
 location: Iapetus; location: Cambrian
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: Iapetus, Cambrian 
Answer:
 location: Iapetus; location: Cambrian