UNLV Geology Professor Steve Rowland sets up a granite sign explaining the history of the Great …

UNLV Geology Professor Steve Rowland sets up a granite sign explaining the history of the Great ...

UNLV Geology Professor Steve Rowland sets up a granite sign explaining the history of the Great Unconformity in Las Vegas on Friday, Nov. 29, 2019 (Elizabeth Brumley/Las Vegas Review-Journal)