Older or Younger?
Relative Age Dating
Unconformities
100
Where does the oldest rock layer occur?
At the bottom
100
Name 3 of the 5 principles of relative-age dating.
Superposition
Original Horizontality
Lateral Continuity
Inclusions
Cross-Cutting Relationships
100
Name 2 possibilities as to why parts of the rock record may be destroyed or missing
Weathering, Erosion, Volcanic Activity
200
Did the small rock pieces form at the same time as the rock containing the pieces?
No the small pieces formed first
200
What can the principle of superposition be used to determine?
The relative age of these rock layers
200
Name the 3 types of unconformities
Three types of unconformities are angular unconformities, disconformities, and nonconformities
300
Which is younger the rock layers or the fault?
The fault
300
What is the principle that states: If one rock contains pieces of another rock, the rock containing the pieces is younger than the pieces themself
Inclusions
300
Name the unconformity: horizontal sedimentary layer overlies nonsedimentary layer
Nonconformity
400
Layer J is _____ than Layer N
younger
400
What principle states that is one geological feature cuts across another feature, the feature that it cuts across is older.
Cross-cutting relationships
400
Name the unconformity: horizontal sedimentary layer overlies tilted sedimentary layer
Angular Unconformity
500
How to you tell which fossils are older and which are younger by looking at the fossil record?
The older fossils at the bottom of the record will be more simple; the fossils get more complex as they get younger and move up the fossil record from the bottom
500
How might lateral continuity help you determine the relative age of rocks?
You can infer that two similar sedimentary rocks separated by distance might be the same rock and the same age.
500
Name the unconformity: horizontal sedimentary layer overlies horizontal sedimentary layer
Disconformity