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28 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Sedimentary rock observations
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-Fossils of similar organisims are found in widely separated places on earth
-Certain fossils are always found in younger, certain other fossils in older rocks -Organisms found in higher, more recent strata are more similar to modern organisms than are those found in lower more ancient strata. |
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Radio isotopes provide a way to?
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-date rocks
- they decay in a predictable pattern -intervals known as half life |
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paleomagnetic dating
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ages of rocks to patterns in earths magnetism wich change over poles ove and occasionally reverse themselves
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continental drift
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sea levels change and molecuar clocks
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continents influence
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oceanic circulation patterns, global climates and sea lvels
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atmospheric change
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changes in oxygen, and c02
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biota
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organisims of all kinds living at a particular time/ place
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flora
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plants living at a particular time or place
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fauna
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all of the animals
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precambrian life
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-small and aquatic
-microscopic prokaryotes,eukaryotes -evolved 2/3 of the way through era -unicelluar eukaryotes & small multicelluar animals fed on floating photosynthetic micro organisims |
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cambrian period
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542 mya-488 mya
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cambrian explosion
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diversification of life
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paleozoic consisted of :
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Ordovician, silurian, devonian,carboniferous and permian
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ordovician
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488-444 mya
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-continents in southern hemisphere
-radiation of marine organisms (brachiopods, mollusks |
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cambrian period
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542 mya-488 mya
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cambrian explosion
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diversification of life
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paleozoic consisted of :
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Ordovician, silurian, devonian,carboniferous and permian
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ordovician
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488-444 mya
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-continents in southern hemisphere
-radiation of marine organisms (brachiopods, mollusks |
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silurian
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444-416 mya
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-continents began to merge together
-animals swim and feed above ocean bottom -first terrestrial arthropods (scorpions & millipedes) |
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devonian
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416-359 mya
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-major land masses move toward eachother
-fish had jaws -club mosses, horsetails and tree ferns became -common ancestors of gymnosperms -massive extinction 75% of all marine species - |
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carboniferous
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359-279
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-large glaciers over southern land masses
-increase in terrestrial animals -insects w/ wings 1st to fly -terrestrial vertebrate lineage split -amphibians became larger and better adapted to existence -amniotes vertebrates with protected eggs. |
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mesozoic consisted of
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triassic, jurassic, and cretacious
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traiassic
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251-200
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-pangea breaking apart
-conifers and seed ferns -first frogs and turtles -mass extinction of 65% of species on earth |
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jurassic
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200-145
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-pangea fully divided
- laurasia- north -godwana-south -first lizzards appeared |
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Creatacious
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145-65 mya
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- continents began to break aprat
-first snakes appeared -yucatan pinnensula massive hit by meteor -massive extinctions |
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Tertiary
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65-26 mya
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-austrailia northward drift
-hot and humid climate -mid tertiary-climate shirt |
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Quaternary
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26-present
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divided into :
pleistocene & holocene |
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Pleistocene
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-climate fluctuations
-animal populations shifted from equator - evolution of hominid lineage |
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