GEO 102 Lecture 19 Outline of Last Lecture I. Sedimentary RocksOutline of Current Lecture II. TaphonomyIII. Modes of PreservationIV. Classifying FossilsV. Fossils and DatingCurrent LectureTaphonomy- What parts are resistant to decay?o Hard tissueso Bones, shells, teeth, nails/claws, wood, seeds- What causes decay?o Physical destructiono Dissolutiono Other critters eating the remains Think about storing your foodModes of Preservation- Unalteredo Intact (frozen mammoth) or fragmented- Replacemento New mineral replaces original- Permineralizedo Pores infilled with minerals from fluid- Cast/moldo Shape preserved in sedimento Impression- shallow cast- can be carbonized Classifying Fossils- Given names like living organisms These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Also for trace fossils- Based mostly on physical traitso Rarely genetics- Geological species are known to change through timeo Exist for a defined window of timeo Change form through timeFossils and Dating- Before Darwin- known that fossils were different between rock types- Older rocks had unfamiliar organisms - This is a dating toolo Index fossils- widespread, common, fossils that lived a short timeo Faunal succession-using fossil change to date in relative fashion Now strengthened with radiometric
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