Fission track dating method
Principle of Original Continuity If layers are deposited horizontally over the sea floor, then they would be expected to be laterally continuous over some distance.Thus, if the strata are later uplifted and then cut by a canyon, we know that the same strata would be expected to occur on both sides of the canyon.
Principle of Superposition Because of Earth's gravity, deposition of sediment will occur depositing older layers first followed by successively younger layers.Watch a sample video | Learn more | Table of contents | About the author Thinkwell's Chemistry is a two-semester college-level course that's accessible enough for introductory college chemistry courses, but rigorous enough for science majors.It's taught by top professors from prestigious universities, so you'll have help from our nation's best chemistry teachers whenever you need it.When you use Thinkwell Chemistry as a study aid, you'll be completely prepared for class, which means better grades.Thinkwell Chemistry has similar content to all major chemistry textbooks, so stop depending on an old-fashioned textbook and start learning the way you want to. from Stanford University and completed postdoctoral work at Du Pont.He concluded that process that are currently operating on the Earth must be the same processes that operated in the past.
This principle is often stated as "the present is the key to the past".
Principles of Stratigraphy Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust.
Geologist in the 1800s worked out 7 basic principles of stratigraphy that allowed them, and now us, to work out the relative ages of rocks.
Principle of Uniformitarianism The principle of Uniformitarianism was postulated by James Hutton (1726-1797) who examined rocks in Scotland and noted that features like mudcracks, ripple marks, graded bedding, etc.
where the same features that could be seen forming in modern environments.
The goal of this lecture is come to come to a scientific understanding of geologic time and the age of the Earth.