Английская Википедия:Blesa Formation

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Шаблон:Infobox rockunit The Blesa Formation is a geological formation in Teruel and La Rioja, Spain whose strata date back to the Barremian of the Early Cretaceous. Dinosaur remains as well as eggs are among the fossils that have been recovered from the formation. Along with the fragmentary anhanguerian pterosaur Iberodactylus. While the lower and upper parts of the formation were deposited in a continental setting, the middle portion of the formation is largely nearshore marine, with remains of plesiosaurs.

Stratigraphy and Lithology

The Belsa Formation is found within the Maestrazgo Basin. Within the stratigraphic sequence it overlies Jurassic rocks in a syn-rift unconformity, and underlies the Alacón Formation.

The formation is up to 150 metres thick and is divided into three distinct unconformity bounded units, which are called the Lower, Middle and Upper Blesa Sequences. The Lower Blesa sequence varies greatly in thickness from less than 10 m up to 100 m is divided up into two members, the lower Cabezo Gordo Member, which consists of red clays and the upper Morenillo Member, which consists of limestones and marls, both of these sequences were deposited in a continental setting. The Middle Blesa Sequence is of a fairly uniform 25-50 metre thickness. Most of the sequence consists of the Josa Member, which consists of oyster rich marls and limestones deposited in a coastal or shallow restricted bay environment. The Upper Blesa Sequence is of variable thickness from 15–70 m. The lower 1–10 m consists of continentally derived clays and marls with sandstone and conglomerate intercalations while the upper 10–60 m are dominated by carbonates.

Vertebrate paleofauna

Reptiles

Reptiles of the Blesa Formation
Taxa	Species	Presence	Material	Notes	Images
Iguanodontia	Indeterminate	Lower Blesa Sequence		3 distinct taxa, one of which has affinities with Delapparentia
Iguanodontia	Unnamed	Upper Blesa Sequence		"Vertebrae, ribs, left illium, partial sacrum, and partial left tibia."
Ankylosauria	Indeterminate	Lower Blesa Sequence	"Isolated teeth, dermal plates and vertebra"
Spinosauridae	Indeterminate	Lower, Upper Blesa Sequence	Isolated Teeth
Dromaeosauridae	Indeterminate	Lower Blesa Sequence	Isolated Teeth
?Carcharodontosauridae	Indeterminate	Lower, Upper Blesa Sequence	Isolated Teeth
Euhelopidae	Indeterminate	Lower Blesa Sequence	Isolated Teeth
Sauropoda	Indeterminate	Lower Blesa Sequence, La Cantalera-1	Post-cranial material
Crocodylomorpha	Indeterminate	Lower Blesa Sequence		Possibly four distinct taxa
Plesiosauria	Indeterminate	Middle Blesa Sequence

Pterosaurs

Pterosaurs of the Blesa Formation
Taxa	Species	Presence	Material	Notes	Images
Istiodactylidae	Indeterminate	Lower Blesa Sequence	Isolated Teeth
Ornithocheiridae	Indeterminate	Lower Blesa Sequence	Isolated Teeth
Iberodactylus	I. andreui	Middle Blesa Sequence	Partial skull

Mammals

Mammals of the Blesa Formation
Taxa	Species	Presence	Material	Notes	Images
Cantalera	C. abadi	Lower Blesa Sequence	Teeth	Pinheirodontid
Eobataar	Indeterminate	Lower Blesa Sequence	Teeth

See also

• List of dinosaur-bearing rock formations