The Calizas y margas de Xert Formation or Xert Formation is an

Early Cretaceous The Early Cretaceous ( geochronological name) or the Lower Cretaceous (chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Ma to 100.5 Ma. Geology Pro ...

(late

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma (million years ago) and 121.4 ± 1.0 Ma). It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is preceded ...

)

geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...

of the

Maestrazgo The Maestrazgo () or Maestrat () is a natural and historical mountainous region, located at the eastern end of the Sistema Ibérico mountain range, in Spain. It encompasses the north of the Autonomous Community of Valencia, in Castellón provinc ...

and Galve Basins in central-eastern

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...

. The formation is described as a coastal claystone, with indications of a transgressive episode, marked by the transition from

marsh A marsh is a wetland that is dominated by herbaceous rather than woody plant species.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p Marshes can often be found at ...

facies In geology, a facies ( , ; same pronunciation and spelling in the plural) is a body of rock with specified characteristics, which can be any observable attribute of rocks (such as their overall appearance, composition, or condition of formatio ...

, with little marine influence, to marine platform facies evidenced by abundant marine invertebrates.Xert Formation
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org

Fossil content

;Dinosaurs * ''

Tastavinsaurus sanzi ''Tastavinsaurus'' is a genus of sauropod dinosaur belonging to the Titanosauriformes. It is based on a partial skeleton from the Early Cretaceous Xert Formation of Spain. The type species is ''Tastavinsaurus sanzi'', named in honor of the Rio ...

''Weishampel et al., 2004, pp. 517-607 ;Invertebrates * Bivalvia indet. * Gastropoda indet. ;Flora * Plantae indet.

Fossil content

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