Discussion
Which of the following microfossils is commonly used in biostratigraphic correlation of Palaeozoic marine strata ?
Answer: C
The answer is Chitinozoans.
Chitinozoans are flask-shaped, organic-walled marine microfossils of uncertain affinity that lived only from the Ordovician to the Devonian. They evolved quickly, are abundant in marine shales and resist acid processing, so they are a standard tool for zoning and correlating Lower Palaeozoic marine strata.
The other groups are too young. Angiosperm pollen appears only in the Early Cretaceous, and is a land-plant fossil in any case. Diatoms are known from the Jurassic and become common in the Cretaceous and Cenozoic. Dinoflagellate cysts are important from the Triassic onwards, so all three are Mesozoic-Cenozoic tools.
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