Unit5 topic 7-8 Flashcards
syncline
a downfold of a rock layer
anticline
an upfold of rock layers
thrust faulting
low angle faulting of rock
fault
a fracture in the bedrock along which rock have moved
fault block mountains
mountains formed by the process of thrust faulting
petrified
a rock-like substance formed when water penetrated dead organic matter, and deposits dissolved mineral matter
carbonaceous film
a type of fossil found in sedimentary rock when organic material is compressed, leaving a thin carbon film
original remains
a type of fossil in which all or part of the original organism has been preserved
Trace fossils
a type of fossil in which evidence of animal activities have been preserved
mould
a type of fossil in which evidence of animal activities have been preserved
principle of superposition
a geological theory, according to this principle of superposition theory, in undisturbed layers of rock, the oldest layers will be on the bottom and the youngest layers will be on the top
strata
layers of sedimentary rock
relative dating
determining the order in which geological events occurred and the relative age of rocks by their positions in rock layers
index fossil
a type of fossil that can be used to determine the age of the material in which it is found
half-life
the amount of time that a given amount of radioactive substance takes to be reduced by one-half
