About: http://webisa.webdatacommons.org/416118577

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Valley fill: A fill structure consisting of any material other than coal waste or other organic material that is placed in the upper most area of a valley that is steeper than 20 degrees.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com