Ipubi Formation, Geological formation in Pernambuco, Brazil.
The Ipubi Formation is a geological layer in the Araripe Basin made up of dark bituminous shales and gypsum-anhydrite beds that formed on an ancient seafloor. These deposits reveal how environmental conditions changed over millions of years in this part of northeastern Brazil.
The formation developed during the Early Cretaceous period roughly 110 to 100 million years ago when the Araripe region was covered by shallow seas. Geologist Beurlen first documented its properties in scientific terms during the 1970s.
The sedimentary sequences within the Ipubi Formation provide geological records of environmental changes during the Cretaceous period in northeastern Brazil.
Access to the formation is typically arranged through guided geological visits or with permission from local authorities who manage the site. Visitors interested in seeing the layers and fossils should prepare for outdoor fieldwork conditions.
The layers hold fossils of an extinct turtle species that lived during the Cretaceous and was preserved in these organic-rich sediments. These remains offer a window into what animals inhabited this ancient seawater environment.
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