Relative time Index / guide fossils Eurypterid Absolute time Key bed AmmoniteLaw of superposition Correlation orogenyUnconformity Radioactive decay uplift Eon Carbon 14 extinction Era Half-life extensivePeriod Stromatolite abundantEpoch Trilobites diverseEvolution Brachipod** Be able to identify the oldest and youngest events in a rock sequence (order of deposition, folding, faulting, igneous intrusions, occurrence of fossils)** Be able to list the periods, epochs in order using the ESRT.
** Be able to find specific organisms on the ESRT and identify the time period in which they existed,
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