4426
Fossils of these worms are seldom found and the earliest known fossil specimen is from the Upper Carboniferous ( Pennsylvanian ) .
 location: Upper Carboniferous; location: Pennsylvanian
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: Upper Carboniferous; location: Pennsylvanian