Terms/Definitions
Misc.
Principles of Stratigraphy
Rules of Stratigraphy
Unconformities/Misc.
100
the process of placing geological events in a sequential order
What is relative dating?
100
ordering rocks layers/faults from oldest to youngest
What is relative dating?
100
Rock layers that are at the bottom are older than those above them
What is superpostion?
100
Uplift, weathering and erosion form ___________
What are unconformities?
100
List the order in which these events occurred, from youngest to oldest.
E, D, A, B, C
200
This term refers to the preserved remains of an organism, plant or animal.
What is a fossil?
200
This term refers to the age of a fossil or rock layer in comparison to other layers.
What is relative age?
200
Layers of sediment were deposited horizontally at first- any tilting or changes occurred afterwards
What is original horizontality?
200
How do we identify which is older: a fault or an igneous intrusion?
if the intrusion is faulted
200
Identify the unconformity:
a wavy line followed by older, igneous or metamorphic rocks
What is a non-conformity?
300
This term refers to magma that pushes up through layers of rock.
What is an intrusion?
300
What force is causing rock layers to be deposited horizontally
What is gravity?
300
Mafic magma (fluid magma low in silica) usually reaches the surface through fissures, forming_____
What is a dike?
300
When did the earthquake in this picture occur? (Which layer was last deposited?)
After Layer W was deposited.
300
Identify the unconformity:
a wavy line followed by older, horizontal sedimentary rocks
what is a disconformity?
400
A line or break in rock layers where movement has occurred
What is a fault?
400
Fossils are not found in ______ and __________rocks because any plant and animal remains trapped in both rocks is burnt off due to extreme heat.
What are Igneous and Metamorphic?
400
A feature that cuts through a rock layer is younger than what it cuts through
What is the principle of Cross-Cutting Relationships?
400
Which numbers in this picture represents igneous intrusions? There are TWO.
What are 2 and 3?
400
Describe the order of events from youngest to oldest.
B, D, F, A, G, E, H, C
500
Breaks in the rock record
What are unconformities?
500
What is the absolute age of the earth? What technique led to this absolute age?
What is 4.6 billion years? Radioactive Decay (Half-life) or Radiometric Dating
500
Events that happen today that shape the Earth also happened in the past.
Principle of uniformity or uniformitarianism?
500
Explain the rule if rocks have whiskers.
contact metamorphose; any rocks with whiskers that are in contact with the igneous intrusion are older than the intrusion
500
What does A represent in the image?
What is erosion?