6912
It consists of some of the oldest reef systems built by a community of organisms rather than the deposit of a limited range of similar organisms , such as Stromatolite mounds deposited by ancient cyanobacteria .
 location: Stromatolite
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: Stromatolite