Lec9 - University of California Berkeley Civil Engineering...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Tilting Erosion University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 9 9/25/07 Evolution of Geologic Time Scale Time Measures o Relative Age Based on stratigraphic principles Uses fossils assemblages to establish Formations o Numerical Age Measurment with the usage of atomic physics Stratigraphic Basics o Principle of original horizontality – sediments deposited in essentially horizontal beds o Principle of Superposition – sediments that lie above other sediments are younger than the sediments they overlie o Uniformitarianism Unconformities o Mark missing time periods o Indicate uplifting tectonic forces that cause erosion or global se level changes o Disconformity – erosional surface between horizontal beds o Nonconformity – erosional surface between sediments and underlying igneous or metamorphic rocks o Angular Unconformity – erosional surface where beds are not parallel
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/02/2008 for the course CE 70 taught by Professor Johnson during the Fall '07 term at Berkeley.

Ask a homework question - tutors are online