Geology 2, Historical Geology Your Name___________________ Lesson 3 - Geologic Time Readings: Earth Through Time (Levin): p. 15-18, 20-24 p. 29-45: Geologic Time (Chapter 3) The Rocks Don’t Lie (Montgomery): Chapter 3, P. 93-96 of Chapter 6 Explain the Difference between Relative Geologic Time and Numeric Geologic Time Relative Geologic Time Describe the following relative geologic time principles: Superposition Original Horizontality Cross-cutting relationships Describe what occurs to produce the following features: An Unconformity An Inclusion
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Geology 1, Physical Geology · Geology 2, Historical Geology Your Name_____ Lesson 3 - Geologic Time Readings: Earth Through Time (Levin): p. 15-18, 20-24 p. 29-45: Geologic Time
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Geology 2, Historical Geology Your Name___________________
Lesson 3 - Geologic Time
Readings:
Earth Through Time (Levin):
p. 15-18, 20-24
p. 29-45: Geologic Time (Chapter 3)
The Rocks Don’t Lie (Montgomery): Chapter 3, P. 93-96 of Chapter 6
Explain the Difference between Relative Geologic Time and Numeric Geologic Time
Relative Geologic Time
Describe the following relative geologic time principles:
Superposition
Original Horizontality
Cross-cutting relationships
Describe what occurs to produce the following features:
An Unconformity
An Inclusion
Numeric Geologic Time
Explain what occurs during radioactive decay using the words: parent and daughter elements, and half-
life. Describe what occurs during a “half life”
Draw a graph showing how parent material changes with time. This graph should show the
exponential decay of the parent material.
Use your graph to show the % of parent that would remain after 4 half lifes. Do this by showing where
you find the number of half lifes on the graph and labeling the % (provide the number) that exists after
4 half lifes.
List at least two common parent-daughter pairs used to date rocks. List the half life of each pair
The geologic time scale has been determined bit-by-bit over the years through relative dating,
correlation, examination of fossils, and radiometric dating. Boundaries on the time scale are drawn
where important changes occur in the fossil record, such as extinction events. The time scale is divided
into a number of types of units of differing size. From the largest units to the smaller units, they are:
Eons.
Eras.
Periods.
Epochs.
Draw a Geologic Time scale showing Eon, Eras, and Periods.
Write the times where each interval begins and ends (in millions of years) next to each division. This URL has a practice page for remembering the time scale. http://tinyurl.com/G2TimeScale
Mnemonic to memorize the Periods of the Paleozoic: Cambrian, Ordovician, Silurian, Devonian,
Mississippian, Pennsylvanian, Permian,: Can Old Silly Dumb Men Play Poker or
Cold Oysters Seldom Develop Many Precious Pearls
Mnemonic to memorize the Periods of the Mesozoic and Cenozoic: Triassic, Jurassic, Cretaceous,
Paleogene, Neogene, Quaternary: Three Jokers Carry Pale New Quarters