Sedimentary facies shift toward the sea as the sea moves out during option d regression.
Regression refers to the moving of the shoreline towards the sea which reveals the ocean floor otherwise submerged under the water. If a regression is major in its capacity, it could lead to the extinction and destruction of many organisms in the sea. Regression and its opposite phenomenon transgression have played an important role in extinction at mass extinction regarding as discovered in fossils.
The creation of the Panthea supercontinent during the late Paleozoic era is also regarded as a result of regression. Other mass regression events are the Permian-Triassic extinction and Cretaceous-Paleogene mass extinction.
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