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Fossils: evidence of past life
Remains or traces of prehistoric life
Types of fossils
• Petrified – cavities and pores are filled with
precipitated mineral matter
• Formed by replacement – cell material is
removed and replaced with mineral matter
• Mold – shell or other structure is buried and
then dissolved by underground water
• Cast – hollow space of a mold is filled with
mineral matter
Fossils: evidence of past life
Types of fossils
• Carbonization – organic matter becomes a thin
residue of carbon (liquid and gas gets squeezed
out due to pressure)
• Impression – replica of the fossil’s surface
preserved in fine-grained sediment
• Preservation in amber – hardened resin of
ancient trees surrounds an organism
Cast and mold of a trilobite
Figure 11.13 B
Fossils: evidence of past life
Types of fossils
• Indirect evidence includes
• Tracks – footprints get preserved in
• Burrows
• Coprolites – fossil dung and stomach contents
• Gastroliths – stomach stones used to grind food by
some extinct reptiles
Fossils: evidence of past life
Conditions favoring preservation
• Rapid burial
• Possession of hard parts
Fossils and correlation
• Principle of fossil succession
• Fossils succeed one another in a definite and
determinable order
• Proposed by William Smith – late 1700s and early
1800s
Determining the ages of
rocks using fossils
Figure 11.14
Fossils: evidence of past life
Fossils and correlation
• Index fossils
• Widespread geographically
• Existed for a short range of geologic time
• Key Bed Layers
• A thin sediment layer deposited instantaneously
that is very widespread geographically and contains
distinctive or easily recognizable material
• Ex: Asteroid impact  iridium 65 myo rock
Radioactivity and
radiometric dating
Atomic structure reviewed
• Nucleus
• Protons – positively charged
• Neutrons
• Neutral charge
• Protons and electrons combined
• Orbiting the nucleus are electrons – negative
electrical charges
Radioactivity and
radiometric dating
Atomic structure reviewed
• Atomic number
• An element’s identifying number
• Number of protons in the atom’s nucleus
• Mass number
• Number of protons plus (added to) the number of
neutrons in an atom’s nucleus
• Isotope
• Variant of the same parent atom
• Different number of neutrons and mass number
Radioactivity and
radiometric dating
Radioactivity
• Spontaneous breaking apart (decay) of atomic
nuclei
• Radioactive decay
• Parent – an unstable isotope
• Daughter products – isotopes formed from the
decay of a parent
Radioactivity and
radiometric dating
Radioactivity
• Radioactive decay
• Types of radioactive decay
• Alpha emission
• Beta emission
• Electron capture
Types of radioactive decay
Figure 11.15
Radioactivity and
radiometric dating
Radiometric dating
• Half-life – the time for one-half of the
radioactive nuclei to decay
• Requires a closed system
• Cross-checks are used for accuracy
• Complex procedure
• Yields numerical dates
The radioactive decay curve
Figure 11.17
Dating sedimentary strata
using radiometric dating
Figure 11.21
Radioactivity and
radiometric dating
Carbon-14 dating
• Half-life of only 5,730 years
• Used to date very recent events
• Carbon-14 produced in upper atmosphere
• Incorporated into carbon dioxide
• Absorbed by living matter
• Useful tool for anthropologists, archaeologists,
historians, and geologists who study very
recent Earth history
Fossils

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Fossils

  • 1. Fossils: evidence of past life Remains or traces of prehistoric life Types of fossils • Petrified – cavities and pores are filled with precipitated mineral matter • Formed by replacement – cell material is removed and replaced with mineral matter • Mold – shell or other structure is buried and then dissolved by underground water • Cast – hollow space of a mold is filled with mineral matter
  • 2. Fossils: evidence of past life Types of fossils • Carbonization – organic matter becomes a thin residue of carbon (liquid and gas gets squeezed out due to pressure) • Impression – replica of the fossil’s surface preserved in fine-grained sediment • Preservation in amber – hardened resin of ancient trees surrounds an organism
  • 3. Cast and mold of a trilobite Figure 11.13 B
  • 4. Fossils: evidence of past life Types of fossils • Indirect evidence includes • Tracks – footprints get preserved in • Burrows • Coprolites – fossil dung and stomach contents • Gastroliths – stomach stones used to grind food by some extinct reptiles
  • 5. Fossils: evidence of past life Conditions favoring preservation • Rapid burial • Possession of hard parts Fossils and correlation • Principle of fossil succession • Fossils succeed one another in a definite and determinable order • Proposed by William Smith – late 1700s and early 1800s
  • 6. Determining the ages of rocks using fossils Figure 11.14
  • 7. Fossils: evidence of past life Fossils and correlation • Index fossils • Widespread geographically • Existed for a short range of geologic time • Key Bed Layers • A thin sediment layer deposited instantaneously that is very widespread geographically and contains distinctive or easily recognizable material • Ex: Asteroid impact  iridium 65 myo rock
  • 8. Radioactivity and radiometric dating Atomic structure reviewed • Nucleus • Protons – positively charged • Neutrons • Neutral charge • Protons and electrons combined • Orbiting the nucleus are electrons – negative electrical charges
  • 9. Radioactivity and radiometric dating Atomic structure reviewed • Atomic number • An element’s identifying number • Number of protons in the atom’s nucleus • Mass number • Number of protons plus (added to) the number of neutrons in an atom’s nucleus • Isotope • Variant of the same parent atom • Different number of neutrons and mass number
  • 10. Radioactivity and radiometric dating Radioactivity • Spontaneous breaking apart (decay) of atomic nuclei • Radioactive decay • Parent – an unstable isotope • Daughter products – isotopes formed from the decay of a parent
  • 11. Radioactivity and radiometric dating Radioactivity • Radioactive decay • Types of radioactive decay • Alpha emission • Beta emission • Electron capture
  • 12. Types of radioactive decay Figure 11.15
  • 13. Radioactivity and radiometric dating Radiometric dating • Half-life – the time for one-half of the radioactive nuclei to decay • Requires a closed system • Cross-checks are used for accuracy • Complex procedure • Yields numerical dates
  • 14. The radioactive decay curve Figure 11.17
  • 15. Dating sedimentary strata using radiometric dating Figure 11.21
  • 16. Radioactivity and radiometric dating Carbon-14 dating • Half-life of only 5,730 years • Used to date very recent events • Carbon-14 produced in upper atmosphere • Incorporated into carbon dioxide • Absorbed by living matter • Useful tool for anthropologists, archaeologists, historians, and geologists who study very recent Earth history