Download relative dating absolute dating principle of superposition principle of

 relative dating absolute dating Chapter 17 Chapter 17 principle of superposition principle of original horizontality Chapter 17 Chapter 17 principle of lateral continuity principle of cross‐cutting relationships Chapter 17 Chapter 17 principle of inclusions principle of fossil succession Chapter 17 Chapter 17 unconformity disconformity Chapter 17 Chapter 17 angular unconformity nonconformity Chapter 17 Chapter 17 correlation guide fossil Chapter 17 Chapter 17 radioactive decay half‐life Chapter 17 Chapter 17 carbon‐14 dating technique Chapter 17 The process of determining the age of an event as compared to other events; involves placing geologic events in their correct chronological order, but does not involve the consideration of when the events occurred in number of years ago. Uses various radioactive decay dating techniques to assign ages in years before the present to rocks. A principle holding that in a vertical sequence of undeformed sedimentary rocks, the relative ages of the rocks can be determined by their position in the sequence—oldest at the bottom followed by successively younger layers. According to this principle, sediments are deposited in horizontal or nearly horizontal layers. A principle holding that rock layers extend outward in all directions until they terminate. A principle holding that an igneous intrusion or fault must be younger than the rocks it intrudes or cuts across. A principle holding that inclusions or fragments in a rock unit are older than the rock unit itself; for example, granite inclusions in sandstone are older than the sandstone. A principle holding that fossils, and especially groups or assemblages of fossils, succeed one another through time in a regular and predictable order. A break in the geologic record represented by an erosional surface separating younger strata from older rocks. An unconformity above and below which the rock layers are parallel. An unconformity below which older rocks dip at a different angle (usually steeper) than overlying strata. An unconformity in which stratified sedimentary rocks overlie an erosion surface cut into igneous or metamorphic rocks. Demonstration of the physical continuity of rock units or biostratigraphic units, or demonstration of time equivalence as in time‐stratigraphic correlation. Any easily identified fossil with an extensive geographic distribution and short geologic range useful for determining the relative ages of rocks in different areas The spontaneous change of an atom to an atom of a different element by emission of a particle from its nucleus (alpha and beta decay) or by electron capture. The time necessary for half of the original number of radioactive atoms of an element to decay to a stable daughter product; for example, the half‐life for potassium 40 is 1.3 billion years. Absolute dating technique relying on the ratio of C14 to C12 in an organic substance; useful back to about 70,000 years ago.