8776
The Devonian shale bedrock of the area is overlain by of compact glacial till , followed by of stiff clay , of weak clay , of silt , of sand , and of fill dirt .
 location: Devonian
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: Devonian