xFill out the following 3 tables before attempting to answer any of the questions in the Lab “quiz.”
1.
Geologic ranges. Microfossils are useful for biostratigraphy or correlating sedimentary rocks and determining their ages. In the table below, indicate the geologic ranges of each microfossil group by placing an x in the cells corresponding to the geologic periods in which they are found.
Microfossil Group
Paleozoic
Mesozoic
Cenozoic
C
O
S
D
M
P
Pm
Tr
J
Cret
P
N
Q
Benthonic forams
X
X
X X
X X X
X
X
X
X
X
X
Planktonic forams x
x
x
x
x
Radiolarians
x
x
x
x
x
x
x
x
x
x
x
x x
Diatoms
x
x
x
x
Coccolithophores
x
x
x
x
x
Dinoflagellates
x
x
x
x
x
x
x
x
x
Ostracodes
x
x
x
x
x
x
x
x
x
x
x
x
x
Conodonts
x
x
x
x
x
x x
x
Sponge spicules
x
x
x
x
x
x x
x
x
x
x
x
x
Spores
x
x x
x
x
x
x
x
x
x
Pollen (gymnosperm)
x
x
x x
x
x x
x
Pollen (angiosperm)
x
x
x
x
Calcareous Algae
x
x
x
x
x
x
Charophytes
x
x
x
x
x
x
x
x
