Question

214 Microfossils and Introduction to the Tree of Life Eukaryote Supergroup Microfossil Group h. Pine tree Ostracode J. Conodont k Charophyte Coralline algae n. Mushroom o. Human sedimentary to the gedo 4. Microfossils are useful for biostratigraphy or correlating sedimentary determining their ages. In the table below, indicate the geologic ranges microfossil group by placing an x in the cells corresponding to the geolo in which they are found. el Mesozoic Canon Microfossil Group Paleozole € OSD MPPTJ KRN Planktonic foraminifera Benthic foraminifera Radiolarians Diatoms Coccolithophores Dinoflagellates Ostracodes Conodonts Sponge spicules Spores Pollen (gymnosperm) Pollen (angiosperm) Calcareous algae Charophytes Key: €. Cambrian, O- Ordovician, S-Silurian, D- Devonian, M Mississippian, P-Pennsylvanian, P Permian, T.Tas J - Jurassic, K = Cretaceous, Paleogene, N-Neogene, 0 - Quaternary. 5. As you can see from your completed table in exercise 4, some groups of organistis have long geologic ranges, and others have much shorter geologic ranges. a. Which groups in the table above have the longest geologic ranges? b. Which groups have short geologic ranges? c. Which group is extinct?

Answer 1

MICROFOSSIL GROUP

C

O

S

D

M

P

P

T

J

K

P

N

Q

PLANTIC FORAMINIFERA

X

X

BENTHIC FORAMINIFERA

X

X

RADIOLARIANS

X

X

DIATOMS

X

X

COCCOLITHOPHORES

X

X

DINOFLAGELLATES

X

X

OSTRACODES

X

X

CONODONTS

X

X

SPONGE SPICULES

X

X

SPORES

X

X

POLLEN (GYMNOSPERM)

X

X

POLLEN(ANGIOSPERM)

X

X

CALCAREOUS ALGAE

X

X

CHAROPHYTES

X

X

LONGEST GEOLOGICAL RANGE -BENTHIC FORAMINIFERA

SHORT GEOLOGICAL GROUP-CHAROPHYTES

EXTINCT GROUP-CONODONT