Unconformities
Earth Science S234
Name: ______________________ Date: ___________________ Period: _____
1. Define the following:
a. Principle of Uniformitarianism:
b. Law of Superposition:
c. Principle of Original Horizontality:
d. Unconformity:
Unconformity
Disconformity
Angular
Unconformity
Nonconformity
Definition
Diagram
2. Below are three columns of rock. Each one is from a different county
across Illinois. McHenry County has a complete and undisturbed
sequence. Kankakee and Champaign Counties are NOT complete and
some of the strata (layers) are missing compared to the McHenry area.
Metamorphic Contact Due To Lava Flow or
Intrusion
3. Label all unconformities in Kankakee and Champaign Counties
(disconformity, angular unconformity, or nonconformity)