Serravallian
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The Serravallian is, in the Ma and 11.63 Ma (million years ago). The Serravallian follows the Langhian and is followed by the Tortonian.[6]
It overlaps with the middle of the South American Land Mammal Ages. It is also coeval with the Sarmatian and upper Badenian Stages of the Paratethys time scale of Central and eastern Europe.
DefinitionThe Serravallian Stage was introduced in stratigraphy by the Italian geologist Lorenzo Pareto in 1865.[7] It was named after the town of Serravalle Scrivia in northern Italy. The base of the Serravallian is at the first occurrence of fossils of the nanoplankton species Sphenolithus heteromorphus and is located in the chronozone C5ABr. The official Global Boundary Stratotype Section and Point (GSSP) for the Serravallian is in the 'Ras il-Pellegrin' section, located at the 'Ras il-Pellegrin' headland in the vicinity of 'Fomm ir-Rih' Bay, SW Malta.The base of the Serravallian is represented in the field as the formation boundary between the Globigerina Limestone formation and the Blue Clay formation.[8] The base of the Serravallian is related to the Mi3b oxygen isotope excursion marking the onset of the Middle Miocene Cooling step. The top of the Serravallian (the base of the Tortonian Stage) is at the last common appearance of calcareous nanoplanktons . It is also associated with the short normal-polarized chronozone C5r.2n. PaleontologyCartilaginous fishBirds
Mammals
Reptiles
ReferencesNotes
LiteratureWikisource has original works on the topic: Cenozoic#Neogene
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