RELATIVE AGES FROM ROCK STRATA AND FOSSILS

 

EVEN BEFORE ABSOLUTE DATING DISCOVERED, GEOLOGISTS KNEW EARTH WAS VERY OLD

HUTTON (1780's) REVOLUTIONIZED SCIENCE BY REALIZING MILLIONS OF YEARS NEEDED FOR SLOW ACCUMULATION OF SEDIMENTS (sand, etc) TO BUILD UP THICK ROCK LAYERS

ROCKS SHOWED "UNIFORMITARIANISM" - TODAY'S PROCESSES WERE SIMILAR IN PAST- INSTEAD OF "CATASTROPHISM" WHICH ASSUMED EXTRAORDINARY EVENTS (BIBLICAL FLOOD, etc) A SHORT TIME (thousands of years) AGO

ROCK STRATA CAN BE TRACED OVER LARGE DISTANCES, SO THEIR POSITIONS CAN BE USED TO ESTABLISH RELATIVE AGES AND HISTORY OF EVENTS

FOSSILS IN ROCKS CAN BE USED AS MARKERS AND GIVE RELATIVE AGES

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NOTE: DISCOVERY OF LONG GEOLOGIC TIME AND BIOLOGICAL EVOLUTION WERE RELATED