Numerical date

Answer:

These dates specify the actual number of years that have passed since an event occurred?

principal of original horizontality

Answer:

this principle states the layers of sediment are generally deposited in a horizontal position?

principal of cross-cutting relationships

Answer:

this principle states that faults and dikes are created after the sedimentary layers were deposited are.

during the pause in deposition, a period of deformation and erosion occurred.

Answer:

what does an angular conformity indicate?

amber

Answer:

is a form of crystallization in which insects are preserved through the resin of trees?

worm burrows

Answer:

some of the oldest known fossils are believed to be?

rapid burial
possession of hard parts

Answer:

two special conditions appear to be necessary for the preservation of fossils?

daughter products

Answer:

the isotopes resulting from the decay of the parent?

radiometric dating?

Answer:

calculating the age of rocks and minerals that contain particular radioactive isotopes?

half-lfe

Answer:

time required for half of the nuclei in a sample to decay?