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IV. Relative Dating
Relative dating
tells us the
sequence in which
events occurred,
not how long ago
they occurred.
Chronological order
- re...
a. Law of Superposition
The law of superposition states that in an
undeformed, undisturbed sequence of
sedimentary rocks, ...
Undistrubed Rock Layer
A Record of Uplift, Erosion,
and Deposition
Distrubed Rock Layer
Animation
b. Original Horizontality
The principle of original horizontality
means that layers of sediment are
generally deposited in...
c. Index fossils
• Index fossils are used to determine
approximate age. Index fossils are
widespread geographically, are
l...
Index Fossils
d. Geological Column
Geologic column is an ideal sequence
of rock layers that contains all the
known fossils and rock form...
Draw it
out!
V. Absolute Dating
Absolute Dating –
• the process of
establishing the age
of an object by
determining the
number of years it
has existed.
• ...
A. Radioactivity
 Radioactivity - the
spontaneous decay
of certain unstable
atomic nuclei
1. Half - life
 A half-life is the amount of time necessary
for one-half of the nuclei in a sample
(parent) to decay to a...
 Radiocarbon dating is the method for
determining age by comparing the amount
of carbon-14 to the amount of carbon-12 in
...
Radioactive atom has an
unstable nucleus that decays
a. Radiation is given off
b. Decay is at a constant rate
c. Decay mat...
Relative and absolute dating
Relative and absolute dating
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Relative and absolute dating

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Transcript of "Relative and absolute dating"

  1. 1. IV. Relative Dating
  2. 2. Relative dating tells us the sequence in which events occurred, not how long ago they occurred. Chronological order - relational
  3. 3. a. Law of Superposition The law of superposition states that in an undeformed, undisturbed sequence of sedimentary rocks, each bed is older than the one above it and younger than the one below it.
  4. 4. Undistrubed Rock Layer
  5. 5. A Record of Uplift, Erosion, and Deposition
  6. 6. Distrubed Rock Layer
  7. 7. Animation
  8. 8. b. Original Horizontality The principle of original horizontality means that layers of sediment are generally deposited in a horizontal position. Draw it out!
  9. 9. c. Index fossils • Index fossils are used to determine approximate age. Index fossils are widespread geographically, are limited to a short span of geologic time, and occur in large numbers. FOUND IN SEDIMENTARY ROCKS
  10. 10. Index Fossils
  11. 11. d. Geological Column Geologic column is an ideal sequence of rock layers that contains all the known fossils and rock formations on Earth arranged from oldest to youngest.
  12. 12. Draw it out!
  13. 13. V. Absolute Dating
  14. 14. Absolute Dating – • the process of establishing the age of an object by determining the number of years it has existed. • It’s the most precise. It gives an actual number to the age
  15. 15. A. Radioactivity  Radioactivity - the spontaneous decay of certain unstable atomic nuclei
  16. 16. 1. Half - life  A half-life is the amount of time necessary for one-half of the nuclei in a sample (parent) to decay to a stable isotope (daughter).
  17. 17.  Radiocarbon dating is the method for determining age by comparing the amount of carbon-14 to the amount of carbon-12 in a sample. 1. When an organism dies, the amount of carbon-14 it contains gradually decreases as it decays. 2. By comparing the ratio of carbon14 to carbon-12 in a sample, radiocarbon dates can be determined. B. Carbon-14
  18. 18. Radioactive atom has an unstable nucleus that decays a. Radiation is given off b. Decay is at a constant rate c. Decay material is formed d. Half-life is the amount of time for ½ of the radioactive element to decay
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