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16 Cards in this Set
- Front
- Back
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strata
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layers of rock
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stratigraphy
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the study of the order of rock layers and the sequence of events they reflect
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geologic time scale
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the categories of time into which Earth's history is usually divided by geologists and paleontologist; eras, periods, epochs
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relative dating techniques
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dating techniques that establish the age of a fossil only in comparison to other materials found above and below it
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lithostratigraphy
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the study of geologic deposits and this formation, stratigraphic relationships, and relative time relationships based on their lithologic (rock) properties
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biostratigraphy
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relative dating techniques using comparison of fossils from different stratigraphic sequences to estimate which layers are older and which are younger.
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isotopes
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variant forms of an element that differ based on thier atomic weight and numbers of neutrons in the nucleus. both stable and unstable(radioactive) exist in nature
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half-life
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the time it takes for half of the original amount of an unstable isotope of an element to decay into more stable forms
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parent isotopes
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the original radioactive isotope in a sample
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daughter isotopes (product)
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the isotope that is produced as the result of radioactive decay of the parent isotopes
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potassium-argon (K-Ar)dating
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radiometric technique using the decay of 40K to 40Ar in potassium-bearing rocks; estimates the age of sediments in which fossils are found
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radiocarbon dating
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radiometric techniques that uses the decay of 14C in organic remains such as wood and bone to estimate the time since death of the organism
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postorbital bar
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a bony ring encircling the lateral side of the eye but not forming a complete cup around the eye globe
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prognathic face
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protection of the face well in front of the braincase
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diastema
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gap between anterior teeth
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dental apes
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early apes exhibiting Y-5 molar patterns but monkey-like postcranial skeletond
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