About: http://webisa.webdatacommons.org/292598585

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	About 30 million years ago there was a period of extensive volcanic activity and mountain building in the western US. This period is k
http://www.w3.org/ns/prov#wasQuotedFrom	boulderingtucson.com