CHAPTER 6C EVIDENCE OF THE PAST. Paul Sereno……1995 Found dinosaur skull 1.5 m long Paleontologist – use fossils to reconstruct the past.

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Presentation transcript:

CHAPTER 6C EVIDENCE OF THE PAST

Paul Sereno……1995 Found dinosaur skull 1.5 m long Paleontologist – use fossils to reconstruct the past

Fossils Trace remains or imprints of living organisms that are preserved by geological processes.

The Age of Fossils Relative Dating – estimating the age of rocks or fossils by their depth in sedimentary rock Absolute Dating – measuring the time it takes for an unstable atom to decay

Absolute Dating

The Geologic Time Scale

Mass Extinctions When a species dies out Scientists feel that the dinosaurs died out so quickly because of a fast changing environment

The Changing Earth

Precambrian Time Grand Canyon Bottom 4.6 billion yrs  542 million yrs Life began here Atmosphere was CHAOTIC NO Oxygen early on 1 st prokaryotes

Precambrian Time 2 nd – Cyanobacteria Photosynthesis and oxygen --  ozone NOW life on earth surface 1 billion yrs ago Multicellular organisms eukaryotes

Paleozoic Era 542 million --  251 million WATER – sponges, corals, snails, squids, trilobites, fish, sharks LAND – ferns, mosses, horsetails, conifers NO flowering plants Insects Salamander-like animals

Paleozoic Era END of REPTILES and winged insects MASS EXTINCTION – 90% of water species are gone

Mesozoic Time 251 million – million “Middle Life” Age of Reptiles –Dinosaurs –Birds –Conifers –Flowering Plants

Mesozoic Time EXTINCTION ??????????

Cenozoic Time 65 million – today Recent Life Age of Mammals –Mastodons –Saber toothed cats –Camels, sloths, small horses –Humans

Cenozoic Time ICE AGE Organisms moved to Equator to live or become extinct

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