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Radiocarbon dating vs potassium argon dating

The layer cake like appearance of concordant strata laid down over hundreds of thousands of years. At a certain locality on the Radiocarbon dating vs potassium argon dating’s surface, the rock column provides a cross section of the natural history in the area during the time covered by the age of the rocks.

Correcting for discordancies can be done in a number of ways and utilizing a number of technologies or field research results from studies in other disciplines. In this example, the study of layered rocks and the fossils they contain is called biostratigraphy and utilizes amassed geobiology and paleobiological knowledge. The pictures of the fossils of monocellular algae in this USGS figure were taken with a scanning electron microscope and have been magnified 250 times. Comparing the record about the discordance in the record to the full rock column shows the non-occurrence of the missing species and that portion of the local rock record, from the early part of the middle Eocene is missing there. This is one form of discordancy and the means geologists use to compensate for local variations in the rock record.

New Orleans after Hurricane Katrina: Unlithified sediment layers laid down in historic times. Three eras of deposition and two discordancies are visible in this highway cut in the Netherlands. Note the color and slight angular change between the lower red bed layering and the middle strata. The upper strata are tilted yet again relative to the bottom layerings well demonstrating the cycles this land formation went through as part of the sea floor.