Relative Dating Lab Objective: To interpret cross-sectional diagrams, and to use logic and basic principles to order geologic events. Introduction: Prior to the discovery of radiometric dating in the early 20th century, which provided a means of absolute dating, archaeologists and geologists had no way of determining the exact age of Earth materials. Relative dating techniques however, have been used for hundreds of years and are instrumental in determining the relative order of past events (i.e. the age of one object in comparison to another), without necessarily determining their exact (or even estimated) age. Even though relative dating methods can only determine the sequential order in which a series of events occurred they remain an incredibly useful in understanding Earth processes. The activity below will help you practice putting geologic events in chronological order. Are you likely to use this skill in some future career? Probably not (unless you become a geologist), but that is not the point. It is about coming to logical conclusions, and defending those conclusions with observations and evidence. Good luck. Jhays Methods: Use geologic principles to determine the sequence of events for each cross-sectional diagram provided. Step 1: Use the numbers to the right of each diagram to list each of the events as they occurred (with 1 being the oldest/first thing to occur). Step 2: Justify/defend your interpretation by listing the geologic principle that helped you arrive at that conclusion in the space provided. Tips on How to Determine the Sequence of Events: 1. Visually locate all unconformities (periods of erosion) and note the rocks that they separate. 2. Visually identify all sedimentary layers. 3. Visually identify all intrusive igneous rocks and faults. Identify other cross-cutting relationships such as tilting, folding, or other deformations. 4. Try starting with the oldest and deepest features you can identify and work your way up through the younger features closer to the surface. When you get stuck, approach the problem from the other direction, identifying the youngest features, and work your way back through time. Hopefully, these two techniques will help you decipher the diagrams. Example: #1: #2: #3: Event Layers Magma Intrusion Erosion #4: Additional Layers Principle Superposition Cross-Cutting Unconformity Superposition Cross-section #7 Cross-section #8 Cross-section #9 #1: #2: #3: #4: #5: #6: #1: #2: Event #3: #4: #5: #6: # 7: #8: # 1: Event #2: #3: #4: #5: #6: #7: Event Principle Principle Principle
Relative Dating Lab Objective: To interpret cross-sectional diagrams, and to use logic and basic principles to order geologic events. Introduction: Prior to the discovery of radiometric dating in the early 20th century, which provided a means of absolute dating, archaeologists and geologists had no way of determining the exact age of Earth materials. Relative dating techniques however, have been used for hundreds of years and are instrumental in determining the relative order of past events (i.e. the age of one object in comparison to another), without necessarily determining their exact (or even estimated) age. Even though relative dating methods can only determine the sequential order in which a series of events occurred they remain an incredibly useful in understanding Earth processes. The activity below will help you practice putting geologic events in chronological order. Are you likely to use this skill in some future career? Probably not (unless you become a geologist), but that is not the point. It is about coming to logical conclusions, and defending those conclusions with observations and evidence. Good luck. Jhays Methods: Use geologic principles to determine the sequence of events for each cross-sectional diagram provided. Step 1: Use the numbers to the right of each diagram to list each of the events as they occurred (with 1 being the oldest/first thing to occur). Step 2: Justify/defend your interpretation by listing the geologic principle that helped you arrive at that conclusion in the space provided. Tips on How to Determine the Sequence of Events: 1. Visually locate all unconformities (periods of erosion) and note the rocks that they separate. 2. Visually identify all sedimentary layers. 3. Visually identify all intrusive igneous rocks and faults. Identify other cross-cutting relationships such as tilting, folding, or other deformations. 4. Try starting with the oldest and deepest features you can identify and work your way up through the younger features closer to the surface. When you get stuck, approach the problem from the other direction, identifying the youngest features, and work your way back through time. Hopefully, these two techniques will help you decipher the diagrams. Example: #1: #2: #3: Event Layers Magma Intrusion Erosion #4: Additional Layers Principle Superposition Cross-Cutting Unconformity Superposition Cross-section #7 Cross-section #8 Cross-section #9 #1: #2: #3: #4: #5: #6: #1: #2: Event #3: #4: #5: #6: # 7: #8: # 1: Event #2: #3: #4: #5: #6: #7: Event Principle Principle Principle
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Transcribed Image Text:Relative Dating
Lab Objective: To interpret cross-sectional diagrams, and to use logic and basic principles to order
geologic events.
Introduction: Prior to the discovery of radiometric dating in the early 20th century, which
provided a means of absolute dating, archaeologists and geologists had no way of determining
the exact age of Earth materials. Relative dating techniques however, have been used for
hundreds of years and are instrumental in determining the relative order of past events (i.e. the
age of one object in comparison to another), without necessarily determining their exact (or
even estimated) age. Even though relative dating methods can only determine the sequential
order in which a series of events occurred they remain an incredibly useful in understanding
Earth processes. The activity below will help you practice putting geologic events in
chronological order. Are you likely to use this skill in some future career? Probably not (unless
you become a geologist), but that is not the point. It is about coming to logical conclusions, and
defending those conclusions with observations and evidence. Good luck.
Jhays
Methods: Use geologic principles to determine the sequence of events for each cross-sectional
diagram provided.
Step 1: Use the numbers to the right of each diagram to list each of the events as they occurred
(with 1 being the oldest/first thing to occur).
Step 2: Justify/defend your interpretation by listing the geologic principle that helped you arrive
at that conclusion in the space provided.
Tips on How to Determine the Sequence of Events:
1. Visually locate all unconformities (periods of erosion) and note the rocks that they
separate.
2. Visually identify all sedimentary layers.
3. Visually identify all intrusive igneous rocks and faults. Identify other cross-cutting
relationships such as tilting, folding, or other deformations.
4. Try starting with the oldest and deepest features you can identify and work your way up
through the younger features closer to the surface. When you get stuck, approach the
problem from the other direction, identifying the youngest features, and work your way
back through time. Hopefully, these two techniques will help you decipher the diagrams.
Example:
#1:
#2:
#3:
Event
Layers
Magma Intrusion
Erosion
#4: Additional Layers
Principle
Superposition
Cross-Cutting
Unconformity
Superposition
Transcribed Image Text:Cross-section #7
Cross-section #8
Cross-section #9
#1:
#2:
#3:
#4:
#5:
#6:
#1:
#2:
Event
#3:
#4:
#5:
#6:
# 7:
#8:
# 1:
Event
#2:
#3:
#4:
#5:
#6:
#7:
Event
Principle
Principle
Principle
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