National Association of Geoscience Teachers
Nagt: Stratigraphy of Ponca State Park
After a study of the principle of original horizontality and the law of superposition, and how to determine the ages of rock layers and how they are formed, students go on a field study to observe and gather information about rock...
CK-12 Foundation
Ck 12: Fourth Grade Science: Earth Science: Relative Ages of Rocks
[Free Registration/Login may be required to access all resource tools.] Looks at how stratigraphy can be used to determine the relative ages of rocks, how unconformities occur, ways to match rock layers in different areas, and how...
CK-12 Foundation
Ck 12: Earth Science: Principle of Horizontality Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide briefly summarizes key points about the Principle of Horizontality and how it relates to sedimentary rock formation. Includes a few questions to...