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16 Cards in this Set

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