Ch 7 GeoDatingFossilization Gales Sara
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University of Minnesota, Crookston *
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1001
Subject
Geology
Date
Jan 9, 2024
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PRE-LAB QUESTIONS
1.
The Principle of ___ tells us that older layers of rock occur below younger layers of rock.
Superposition
2.
Match each unconformity to its definition:
1. Nonconformity
a. Surface between strata not parallel to each other
2. Disconformity
b. Surface between igneous/metamorphic rocks and
sedimentary rocks
3. Angular Unconformity
c. Surface between layers that are parallel to each other
3.
What are three types of fossilization processes that preserve body fossils?
Petrification, Permineralization, Replacement
4.
True or False? A mold is formed when an impression is buried and lithified.
True
5.
In what types of environments are body fossils most likely to occur?
Anoxic- deltas, marine environments
Lagerstatten- volcanic ash
©2016, eScience Labs
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Geologic Dating and Fossilization
EXERCISE 1 DATA SHEET
Unconformities:
(youngest)
6
.
5
.
4
.
3
.
2
.
(oldest)
1
.
©2016, eScience Labs
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Rock Units:
(youngest)
17.
16.
15.
14.
13.
12.
11.
10.
9.
8.
7.
6.
5.
4.
3.
2.
(oldest)
1.
EXERCISE 1 POST-LAB QUESTIONS
1.
How many nonconformities are in the diagram?
2.
How many disconformities are in the diagram?
3.
How many angular unconformities are in the diagram?
4.
What principles did you use to determine the relative ages of the rock units? (Select all
that apply.)
a.
Principle of Superposition
b.
Principle of Original Horizontality
©2016, eScience Labs
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Geologic Dating and Fossilization
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c.
Principle of Lateral Continuity
d.
Principle of Cross-Cutting Relationships
e.
Principle of Inclusions
f.
Principle of Unconformities
5.
How did you determine the relative age of rock unit “J”?
©2016, eScience Labs
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Geologic Dating and Fossilization
EXERCISE 2 DATA SHEET
Table 1. Shell Measurements
Measurement
(cm)
Shell
Plaster of Paris
Shell in Sand
Plaster of Paris
Shell in Potting Soil
Plaster of Paris
Shell in Play-Doh®
Length
4
4
4
3.4
Width
4.5
4.5
4.5
4.5
Depth
2.1
2.1
2
2
Table 2. Plaster Shell Observations
Sand
Potting Soil
Play-Doh®
Observations
Some ridges were lost,
otherwise no significant
changes
Outline was seen, but
ridges were lost
Shrunk a few
centimeters, ridges and
shape are intact
©2016, eScience Labs
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Geologic Dating and Fossilization
EXERCISE 2 POST-LAB QUESTIONS
1.
Identify which objects are the molds and which are the casts in your exercise.
2.
Which cast provides the most information about the shell? Why?
3.
How was the formation of your mold and cast different from how molds and casts form in
nature?
4.
What type of environment would you expect to best preserve body fossils? Use evidence
from this exercise to support your answer.
©2016, eScience Labs
Geologic Dating and Fossilization
Geologic Dating and Fossilization
Geologic Dating and Fossilization
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