The area in question was roughly defined in 2010 by the U.S. Geological Survey.
In March 2009, Reuters reported that a U.S. Geological Survey study indicated vast mineral resources.
I spoke with Andy Snyder from the U.S. Geological Survey about the phenomenon.
"Yes, some of the Geological Survey maps," said Ernest, opening up a chart case.
As a result of that correspondence he undertook to make a Geological Survey for me.
In 1852-3, a Geological Survey of the State was wisely decided upon, and a liberal provision for its execution made.
In 1838 he came to Davenport and began to make a Geological Survey of Iowa.
The report of the Director of the Geological Survey is a document of unusual interest.
You are probably referring to the Geological Survey of this island.
The Geological Survey of New York has given to the world a new nomenclature.