Robert Sterling Yard,
The Book of the National Parks
“ Already mountains are wearing down and sea bottoms are building up with their refuse. Sediments carried by the rivers are depositing in strata, which some day will harden into rock.We are looking now at the close of the era which [Pg 10] geologists call Archean, because it is ancient beyond knowledge. A few of its rocks are known, but not well enough for many definite conclusions. All the earth's vast mysterious past is lumped under this title.The definite history of the earth begins with the close of the dim Archean era. ”
