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HTOWN

GEOLOGIC TIME

TermDefinition
GEOLOGIC TIME EARTH'S HISTORY BROKEN DOWN INTO SMALLER UNITS- EON/ERA/PERIOD.EPOCH
PRECAMBRIAN LONGEST UNIT OF GEO TIME- EARTH FORMING/OCEANS FORMING/UNICELLULAR LIFE/CYANOBACTERIA
PALEOZOIC ANCIENT LIFE
MESOZOIC MIDDLE ERA-AGE OF REPTILES
CENOZOIC MAMMAL/HUMAN ERA
FOSSIL EVIDENCE OF THE PAST USUALLY PRESERVED IN ROCK
CYANOBACTERIA EARLIEST LIFE FORM ON EARTH
TRACE FOSSIL EVIDENCE OF ANIMAL ACTIVITY (FOOT PRINTS/WORM/HOLES/NESTS)
AMBER TREE SAP
MOLD CAVITY IN ROCK FROM ORGANISM DECAYING. EX: ICE CUBE TRAY
CAST SEDIMENTS FILLING IN CAVITY. EX: ICE CUBE
INDEX FOSSIL SPECIES THAT WERE ABUNDANT DURING A SHORT TIME AND WERE WIDESPREAD GEOGRAPHICALLY. (LOTS OF THEM IN THE ROCK LAYER)
PETRIFIED REMAINS ORGANIC MATERIAL IN BONES AND WOOD REPLACED WITH HARDER MINERALS LIKE QUARTZ
PRESERVED REMAINS ALMOST PERFECTLY PRESERVED REMAINS IN ICE/TAR/AMBER/PEAT BOGS
CARBONACEOUS FILM CARBON RESIDUE LEFT BEHIND ON ROCK BECAUSE CARBON IS IN ALL LIVING THINGS
RADIOCARBON DATING CARBON 14 USED TO DATE FOSSILS/BONES AND WOOD BECAUSE THE CARBON 14 DECAYS IN THE ROCK RECORD.
UNCONFORMITY A GAP IN THE ROCK RECORD
UNIFORMITARIANISM EARTH PROCESSES TODAY ARE SIMILAR TO THOSE THAT OCCURRED IN THE PAST
LAW OF SUPERPOSITION LAW THAT STATES OLDER ROCKS ARE ON THE BOTTOM UNLESS DISTURBED
HALF-LIFE TIME IT TAKES FOR HALF THE ATOMS IN AN ISOTOPE TO DECAY
RADIOACTIVE DECAY NEW ELEMENT FORMED WHEN NUMBER OF PROTONS ARE CHANGED IN AN ATOM
Created by: msannehtown
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