Microfossils Answer Sheet 2024 done
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Georgia State University *
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1121K
Subject
Geology
Date
Apr 3, 2024
Type
docx
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Uploaded by CoachWolverine579
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
2.
Microfossils are useful for paleoenvironmental interpretation. Put an x in the cell for the environments in which the microfossil groups lived.
Microfossil Group
Continental (Non-marine/
Freshwater)
Marine
Foraminifera
x
Radiolaria
x
Diatom
x
x
Coccolithophores
x
Dinoflagellates
x
x
Ostracodes
x
x
Conodonts
x
Spores
x
Pollen (gymnosperm)
x
Pollen (angiosperm)
x
Calcareous algae
x
Charophytes
x
Coralline algae
x
3.
A particular sequence of sedimentary rock layers is found to contain the microfossils listed in the table below.
a.
List the depositional environment (marine, continental (nonmarine/freshwater), or mixed) of the groups in each layer, in the table.
b.
What age would each layer of rock be that contains this assemblage of microfossils? Give period name(s) for each layer. Make sure that all of the microfossils lived during the period names you list.
Position in Vertical
Sequence
Microfossil Groups
Depositional Environment
(Marine, Continental, Mixed)
Geological Periods Where All Might Be Found Together
Layer A (Top)
Angiosperm pollen
continental
Late Cretaceous to Present
Layer B
Angiosperm pollen and ostracodes
Mixed
Cretaceous
Layer C
Ostracodes, angiosperm pollen, and
diatoms
Mixed
Neogene
Layer D
Planktonic foraminifera and ostracodes
marine
Cretaceous
Layer E (Bottom)
Coccoliths, foraminifera, and radiolaria
marine
Cretaceous
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