Contents

Alcobaça Formation

Alcobaça Formation
Stratigraphic range: Kimmeridgian ~156.9–152.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Sub-units	Camadas de Guimarota
Underlies	Lourinhã Formation
Overlies	Montejunto Formation
Lithology
Primary	Marl
Other	Mudstone, coal, siltstone, limestone, sandstone
Location
Coordinates	39°36′N 9°00′W / 39.6°N 9.0°W / 39.6; -9.0
Approximate paleocoordinates	33°42′N 1°36′E / 33.7°N 1.6°E / 33.7; 1.6
Region	Estremadura, Leiria, Lisboa
Country	Portugal
Extent	Lusitanian Basin
Type section
Named for	Alcobaça, Portugal
Named by	Choffat
Year defined	1885
Alcobaça Formation (Portugal)

The Alcobaça Formation, previously known as the Guimarota Formation and also known as the Consolação Unit,^[1] is a geological formationinPortugal.^[2] It dates back to the Kimmeridgian stage of the Late Jurassic. It is an important source of information on the diversity of Late Jurassic mammals.^[3][4] Many of the fossils were collected from the now disused and flooded Camadas de Guimarota coal mine.

Vertebrate paleofauna[edit]

Dinosaur eggs are geographically located in Lisbon District, Portugal.^[5] Dinosaur tracks are geographically located in Leiria District, Portugal.^[6]

Amphibians[edit]

Choristoderes[edit]

Ornithischians[edit]

Indeterminate euornithopod remains located in Lisbon District.^[5] Indeterminate stegosaurid remains present in Lisbon District.^[5]

Ornithischians of the Alcobaça Formation
Genus	Species	District	Stratigraphic position	Abundance	Notes	Images
Dacentrurus[5]	D. armatus[5]	Lisboa[5]
Ornithopoda[5]	Indeterminate[5]	Lisboa[5]
Stegosaurus[7]	S. cf. ungulatus				"...one tooth, five cervical vertebrae (including the axis), five dorsal vertebrae, cervical and dorsal ribs, three caudal vertebrae, chevrons, preacetabular process of the left ilium, right tibia, fibula, astragalus and [calcaneus], a cervical plate, and several fragments of plates."
Trimucrodon[5]	T. cuneatus[5]	Lisboa[5]			Later determined to be indeterminate ornithischian remains.[5]

Saurischians[edit]

Indeterminate sauropod remains located in Leiria and Lisboa.^[8]

Saurischians of the Alcobaça Formation
Genus	Species	District	Stratigraphic position	Abundance	Notes	Images
Allosaurus[6]	Indeterminate[6]	Leiria[6]
Aviatyrannis	A. jurassica	Guimarota
Lusotitan[5]	L. atalaiensis[5]	Lisboa[5]
Ceratosaurus[5]	Indeterminate[5]	Lisboa[5]
Dinheirosaurus[5]	D. lourinhanensis[5]	Lisboa[5]		"[Two] cervicals, [nine] dorsals, ribs, limb elements."[9]
Lourinhasaurus[5]	L. alenquerensis[5]	Lisboa[5]
Megalosaurus[5]	M. insignis[5]	Lisboa[5]			Later determined to be indeterminate theropod remains.[5]

Turtles[edit]

Lepidosauromorphs[edit]

Lepidosauromorphs of the Alcobaça Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Becklesius	B. hoffstetteri	Guimarota			Paramacellodid lizard
Dorsetisaurus	D. purbeckensis	Guimarota			Anguimorph lizard
Marmoretta	Indeterminate	Guimarota			Basal Lepidosauromorph
Portugalophis	P. lignites	Guimarota			Stem-snake
Saurillodon	S. proraformis	Guimarota			A lizard
Saurillus	S. henkeli, cf. obtusus	Guimarota			A lizard
cf. Opisthias[10]	Indeterminate	Andrés, Pombal			Arhynchocephalian

Crocodyliformes[edit]

Crocodyliformes of the Alcobaça Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Goniopholis	G. baryglyphaeus	Guimarota			Agoniopholidid
Knoetschkesuchus	K. guimarotae	Guimarota			Anatoposaurid
Lisboasaurus	L. mitracostatus	Guimarota
Machimosaurus	M. hugii	Guimarota			A marine machimosaurid

Mammals[edit]

See also[edit]

• List of dinosaur-bearing rock formations
• List of fossiliferous stratigraphic units in Portugal

References[edit]

Bibliography[edit]

• Weishampel, David B.; Peter Dodson, and Halszka (eds.) Osmólska. 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2