Skip to content Increase Font Size. Chronostratigraphy Geochronology Isotope geochemistry Law of superposition Luminescence dating Samarium—neodymium dating. Laws of Stratigraphy Original Horizontality - sedimentary strata are deposited in layers that are horizontal or nearly horizontal, parallel to or nearly parallel to the Earth's surface. Age of Earth estimated from time required to cool from an initially molten state. McDougall I. Major Triggers for Mass Wasting: And, what about other findings like fossil fish, plants and insects?
Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.
Dating Rocks and Fossils Using Geologic Methods
How do they know these ages? Middle School Earth Science: Try it risk-free for 30 days. Time Stratigraphic Units A bodies of rocks that were deposited during the same geologic time interval. Dark grey metamorphosed basalt 3.