Principle of fossil succession different types of

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Principle of Fossil SuccessionDifferent types of fossils always appear and disappear in same order within geologicrock record. Therefore, any time period can be recognized by its fossil contentIndex Fossil: widespread fossil that is limited to a short span of geologic timeWays to Become a FossilDeathBurialoSurvive decay/mechanical destruction long enough to be buried in sedimentDiagenesisoOnce buried, remains must be found by a paleontologistTaphonomic FiltersStudy of all processes occurring after the death of an organism until it is discovery asa fossilFilters:oHard/Soft partsSoft tissue is less likely to be preservedoNumber of partsOƌgaŶisŵ ǁith ŵaŶLJ ͚paƌts͛ is ŵoƌe likelLJ to fall apaƌt aŶddisarticulate as the carcass decaysoPopulation AbundanceSpecies that was abundant in life is more likely to be preserved thanone that was rareoDepositional environmentOrganism that dies in a place where it is immediately covered bysediment is more likely to be fossilized than one that dies in an areaof net erosionTypes of Fossils
Body Fossil: preserved remnants of an organismTrace Fossil: remnants of the activities of live organisms (no body parts present)Compressional Fossil: organism has been flattened by the vertical pressure ofoverlying rocksPermineralization: original hard parts of an organism have additional mineralsdeposited in their pore spacesResin Fossils (amber): organisms are trapped by the sticky sap excreted by someplantsImpression Fossil: original remains of the organism have been completely dissolvedor otherwise destroyed, leaving an imprint of the organism in the rockoMold: impression made in the Earth or rock material by the exterior/interiorof a fossil organismoCast: secondary rock/mineral fills a natural mold, producing a replica of theexternal detailsTrackways: continuous series of tracks or footprints left by a single organismoProvide information on soft tissue, movement, and behavior of an organismCoprolites: fossilized excrement; determines diet of extinct organismsIndex FossilsIndex Fossil- geographically widespread fossil that is limited to a short span of geologictime (ammonites)Stratigraphic RangeStratigraphic Range- the duration of time between the oldest occurrence of fossilspeciesEvolution of LifeFossil SuccessionPrinciple of Fossil Succession- fossils are arranged according to their geologic age anddocument the evolution of life through timeCretaceousTertiary BoundaryAround 65 million years agoMarks the point in which dinosaurs are no longer found in the rock recordEvidence for Asteroid Impacts
Evidence for the Asteroid Impact HypothesisImpact CraterThis 150-kilometer-wide crater lies just off the Yucatan peninsula. Scientists calculate that itwas blasted into Earth by a 10-kilometer-wide asteroid or comet traveling 30 kilometers persecond -- 150 times faster than a jet airliner.

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Term
Spring
Professor
BradleyCramer
Tags
Mole, pH, Tide

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