A fossil recognized as unique to a certain time period is known as
an index fossil
a distinct fossil.
a time marker fossil.
a marker fossil.
Which fossil layer is the youngest?
fossil layer 1
fossil layer 2
fossil layer 3
fossil layer 4
The time it takes for one half of the original, unstable atoms to decay into daughter products is called the
relative decay
margin of decay
half-life
mineralization rate
