Palaeozoic Biostratigraphic Correlation Using Microfossils

Biostratigraphic correlation uses fossils to date and match rock layers. For Palaeozoic marine strata, specific microfossils are particularly useful due to their abundance, wide distribution, and rapid evolution.

Analysis of Microfossil Options

• Angiosperm pollen: Primarily found in younger strata (Mesozoic and Cenozoic), not typically used for Palaeozoic correlation.
• Diatoms: Mostly Cenozoic age, common in marine and freshwater sediments, but not characteristic of the Palaeozoic.
• Dinoflagellates: Appear later than the Palaeozoic, becoming significant in the Mesozoic.
• Chitinozoans: These are small, organic-walled microfossils that originated in the Ordovician period and persisted through the Devonian into the Carboniferous. They are abundant in many Palaeozoic marine environments and are excellent index fossils for biostratigraphic correlation during this time.

Conclusion

Based on their stratigraphic range and environmental association, Chitinozoans are the microfossils most commonly used for biostratigraphic correlation of Palaeozoic marine strata.