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 oldest?
fossil layer 1
fossil layer 2
fossil layer 3
fossil layer 4
Which fossil layer is the youngest?
A break in strata is known as a(n)
The time it takes for one half of the original, unstable atoms to decay into daughter products is called the
margin of decay