# Xert Formation

The Calizas y margas de Xert Formation or Xert Formation is an Early Cretaceous (late Barremian) geologic formation of the Maestrazgo and Galve Basins in central-eastern Spain. The formation is described as a coastal claystone, with indications of a transgressive episode, marked by the transition from marsh facies, with little marine influence, to marine platform facies evidenced by abundant marine invertebrates.

## Fossil content
### Dinosaurs

* Tastavinsaurus sanzi

### Invertebrates

* Bivalvia indet.
* Gastropoda indet.

### Flora

* Plantae indet.

## Correlation

Early Cretaceous stratigraphy of Iberia :
| Ma | Age | Paleomap \ Basins | Cantabrian | Olanyà | Cameros | Maestrazgo | Oliete | Galve | Morella | South Iberian | Pre-betic | Lusitanian |
| 100 | Cenomanian | | La Cabana | Sopeira | Utrillas | Utrillas | Mosquerela | | | | | Caranguejeira |
| 100 | Cenomanian | | Altamira | Sopeira | Utrillas | Utrillas | Utrillas | | | | | | | Caranguejeira |
| 100 | Cenomanian | | Eguino | Sopeira | Utrillas | Utrillas | Utrillas | | | | | Caranguejeira |
| 125 | Albian | | Ullaga - Balmaseda | Lluçà | Utrillas | Utrillas | Utrillas | | | Traiguera | | Caranguejeira |
| 125 | Albian | | Monte Grande | Lluçà | Escucha | Escucha | Escucha | | | Jijona | | Caranguejeira |
| 125 | Albian | | Itxina - Miono | Lluçà | Escucha | Escucha | Escucha | | | | | Caranguejeira |
| 125 | Aptian | | Valmaseda - Tellamendi | Lluçà | Ol Gp. - Castrillo | Benassal | Escucha | Benassal | | | | Olhos |
| 125 | Aptian | | Valmaseda - Tellamendi | Font | En Gp. - Leza | Morella/Oliete | Oliete | Villaroya | Morella | Capas Rojas | | Almargem |
| 125 | Aptian | | Patrocinio - Ernaga | Senyús | En Gp. - Jubela | Forcall | Forcall | Forcall | Morella | Villaroya | Upper Bedoulian | Figueira |
| 125 | Barremian | | Vega de Pas | Cabó | Abejar | Xert | Alacón | Xert | Morella | Huérguina | Upper Bedoulian | Assises |
| 125 | Barremian | | Vega de Pas | Prada | Abejar | Artoles | Artoles | Artoles | Morella | Collado | Moutonianum | Papo Seco |
| 125 | Barremian | | Vega de Pas | Rúbies | Tera Gp. - Golmayo | Alacón/Blesa | Blesa | Camarillas | Mirambel | Collado | Moutonianum | Papo Seco |
| 150 | Hauterivian | | Vega de Pas | Rúbies | Ur Gp. - Pinilla | Llacova | Blesa | Castellar | Tera Gp. - Pinilla | Villares | | Porto da Calada |
| 150 | Hauterivian | | Vega de Pas | Rúbies | Ur Gp. - Pinilla | Llacova | hiatus | Castellar | | Villares | | Porto da Calada |
| 150 | Hauterivian | | Vega de Pas | Rúbies | Ur Gp. - Pinilla | Huerva | hiatus | Castellar | Gaita | | | Porto da Calada |
| 150 | Valanginian | | Villaro | Rúbies | Ur Gp. - Larriba | Huerva | hiatus | Castellar | Ped Gp. - Hortigüela | | | Porto da Calada |
| 150 | Valanginian | | Villaro | Rúbies | Ped Gp. - Hortigüela | Huerva | hiatus | Castellar | Ped Gp. - Piedrahita | | | Porto da Calada |
| 150 | Valanginian | | Villaro | Rúbies | Peñacoba | Huerva | hiatus | Galve | Ped Gp. - Piedrahita | Miravetes | | Porto da Calada |
| 150 | Berriasian | | Cab Gp. - Arcera | Rúbies | Valdeprado | hiatus | hiatus | Alfambra | Ped Gp. - Piedrahita | Miravetes | | Porto da Calada |
| 150 | Berriasian | | Cab Gp. - Arcera | | TdL Gp. - Rupelo | hiatus | hiatus | Arzobispo | hiatus | Tollo | | Porto da Calada |
| 150 | Berriasian | | Cab Gp. - Arcera | | On Gp. - Huérteles Sierra Matute | hiatus | hiatus | Arzobispo | hiatus | Tollo | | Porto da Calada |
| 150 | Tithonian | | Lastres | | Tera Gp. - Magaña | hiatus | Higuereles | Higuereles | hiatus | Tera Gp. - Magaña | | Lourinhã |
| 150 | Tithonian | | Lastres | | Tera Gp. - Magaña | hiatus | Higuereles | Higuereles | Arzobispo | Tera Gp. - Magaña | | Lourinhã |
| 150 | Tithonian | | Lastres | | Ágreda | hiatus | Higuereles | Higuereles | Arzobispo | Tera Gp. - Magaña | | Lourinhã |
| Legend | Legend | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation | Major fossiliferous, oofossiliferous, ichnofossiliferous, coproliferous, minor formation |
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