13695
Here , in an area smaller than a city block , lay buried traces of countless weird creatures that had frolicked more than 500 million years ago -- creatures whose anatomical variety far exceeded what can be found in all the world 's oceans today .
 date: more than 500 million years ago; date: today
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities: more than 500 million years ago, today 
Answer:
 date: more than 500 million years ago; date: today