Fossil Record ppt 2003

Fossil Record ppt 2003 - The Fossil Record What is a...

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The Fossil Record
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What is a fossil? Remains of organisms chemically changed into rock
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Taphonom y and Fossilizatio n What happens to an organism after its death?
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Limitations of the fossil record Problems of representation Problems identifying species Species → breeding, fertile offspring Untestable in fossils Similar appearance Variation: inter- or intra-species?
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Intra-species variation 1. Phenotype -dog breeds 2. Age -Taung child ↑ Labrador retriever ← Boston Terrier
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Intra-species variation 3. Sexual dimorphism 4. Disease - Flores Man Baboon skulls: juvenile (a,b), adult female (c), adult male (d) Cranium of Flores Man (left) compared to modern human (right)
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Classifying Variation Two main approaches: Lumpers variation → intraspecific - fewer species Splitters variation → interspecific - more species
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Geologic Time Age of Earth: 4.6 billion years Mesozoic (245-65 mya) First mammals: 70 mya Cenozoic (65 mya →) 2 periods: Tertiary (65-1.6 mya) Quaternary (1.6 mya →) First primates: 65 mya First hominids: 7 mya
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Continental drift → speciation Present
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Fossil Record ppt 2003 - The Fossil Record What is a...

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