List of pterosaur-bearing stratigraphic units

This is a list of stratigraphic units pterosaur fossils have been recovered from. Units

listed are all either formation rank or higher (e.g. group).

Name	Age	Location	Description
Aguja Formation	Campanian	USA	Description
Alamyshik Formation	Albian	Kyrgyzstan	Description
Alum Shale	Toarcian	UK	Description
Amminadav Formation or Bet-Meir Formation	Cenomanian	Israel	Description
Antlers Formation	Aptian - Albian	USA	Description
Apón Formation	Aptian	Venezuela	Description
Argiles d´Ecqueville	Kimeridgian	France	Description
Argiles d'Octeville	Kimmeridgian	France	Normannognathus
Argilliti di Riva di Solto	Norian	Italy	Eudimorphodon
Artoles Formation	Barremian	Spain	Description
Austin Group	Coniacian	Mexico	Muzquizopteryx
?Bahia Series	Aptian	Brazil	Description
Bakhar Svita	Middle Jurassic	Mongolia	Description
Balabansai Svita	Callovian	Kyrgyzstan	Description
Bissekty Formation	Turonian	Uzbekistan	Azhdarcho
Blackhawk Formation	Campanian	USA	Description
Blesa Formation	Barremian	Spain	Description
Blue Lias	Rhaetian - Sinemurian	UK	Description
Bostobin Formation	Santonian - Campanian	Kazakhstan	Aralazhdarcho, "Samrukia"^[1]
Buda Limestone	Cenomanian	USA	Description
Budden Canyon Formation	Aptian	USA	Description
Calcaires tâchetés	Tithonian	France	Ctenochasma
Calizas de La Huergina Formation	Barremian	Spain	Description
Calizas y Margas de Sierra Perenchiza Formation	Campanian - Maastrichtian	Spain	Description
Camadas de Guimarota	Kimmeridgian	Portugal	Description
Camarillas Formation	Barremian	Spain	Description
Cambridge Greensand	Albian	UK	Coloborhynchus^[2]
Cañadon Asfalto Formation	Callovian - Oxfordian	Argentina	Description
Candeleros Formation	Albian	Argentina	Description
Caturrita Formation^[3]	Carnian - Norian	Brazil	Faxinalipterus
Cerro del Pueblo Formation	Campanian	Mexico	Description
Chenini Formation	Albian	Tunisia	Description
Chico Formation	Campanian	USA	Description
?Chinle Formation	Carnian - Rhaetian	USA	Description
Chipping Norton Formation	Bathonian	UK	Description
Chulec Formation	Albian	Peru	Description
?Clarens Formation	Pliensbachian - Toarcian	South Africa	Description
Cornet Bauxite	Berriasian – Hauterivian	Romania	Description
Cotswold Slate	Bathonian	UK	Description
Crato Formation	Albian	Brazil	Description
Csehbánya Formation	Santonian	Hungary	Bakonydraco
Curtis/Stump Formation	Callovian	USA	Description
Daohugou Beds	Middle - Late Jurassic	China	Jeholopterus, Pterorhynchus, Wukongopterus^[4]
Dashanpu Formation	Bathonian - Oxfordian	China	Angustinaripterus
Densus-Ciula Formation	Maastrichtian	Romania	Hatzegopteryx
Dinosaur Park Formation	Campanian	Canada	Navajodactylus^[5]
Dockum Group	Carnian - Rhaetian	USA	Description
Dolomia di Forni	Norian	Italy	Eudimorphodon, Preondactylus
Dunvegan Formation	Cenomanian	Canada	Description
Dzharakuduk Formation	Cenomanian	Uzbekistan	Description
Eagle Ford Formation	Turonian	USA	Description
Ejinhoro Formation	Early Cretaceous	China	Description
El Castillar Formation	Berriasian - Barremian	Spain	Description
El Gallo Formation	Maastrichtian	Mexico	Description
Elligserbrink Shale	Early Cretaceous	Germany	Description
Enciso Group	Aptian	Spain	Description
Erlhaz Formation	Aptian	Niger	Description
Eumeralla Formation	Albian	Australia	Description
Eutaw Formation	Coniacian - Santonian	USA	Description
Exu Formation	Late Cretaceous	Brazil	Description
Fleming Fjord Formation	Norian - Rhaetian	Greenland	Eudimorphodon
Forest Marble Formation	Bathonian	UK	Description
Gault Clay	Albian	UK	Lonchodectes
Gisement des Bessons	Tithonian	France	Cycnorhamphus
Glen Rose Formation	Aptian - Albian	USA	Description
Gosau Formation	Campanian	Austria	Description
Gramme Formation	Maastrichtian	Brazil	Nyctosaurus
"Great Oolite"	Bathonian	UK	Description
Greenhorn Limestone	Cenomanian	USA	Description
?Gres à Avicula contorta	Norian - Rhaetian	France	Description
Grès de la Crèche inférieurs	Tithonian	France	Description
Hakobuchi Group	Campanian	Japan	Description
?"Hallau Bonened"	Rhaetian	Switzerland	Description
Hampen Marly Formation	Bathonian	UK	Description
Hanson Formation	Early Jurassic	Antarctica	Description
Hasandong Formation	Hauterivian - Barremian	South Korea	Description
Hastings Beds	Berriasian – Valanginian	UK	Coloborhynchus, Lonchodectes
Hekou Formation	Early Cretaceous	China	Description
Hell Creek Formation	Maastrichtian	USA	Description
Himenoura Group	Santonian	Japan	Description
Huachihuanhe Formation	Late Jurassic	China	Huanhepterus
Hudspeth Formation	Albian	USA	Bennettazhia
Ilek Formation	?Hauterivian - Albian	Russia	Description
Intertrappean Beds	Maastrichtian	India	Description
Isalo III Formation	Bathonian	Madagascar	Description
Jagua Formation	Oxfordian	Cuba	Cacibupteryx, Nesodactylus
Javelina Formation	Maastrichtian	USA	Quetzalcoatlus
Jiufotang Formation	Aptian	China	Chaoyangopterus, Eoazhdarcho, Eopteranodon, "Huaxiapterus", Jidapterus, Liaoningopterus, Liaoxipterus, Nemicolopterus, Nurhachius, Sinopterus
Karabastau Formation	Oxfordian - Kimmeridgian	Kazakhstan	Batrachognathus, Sordes
Kayenta Formation	Sinemurian - Pliensbachian	USA	Rhamphinion
Kem Kem Beds	Cenomanian	Morocco	Alanqa,^[6] Siroccopteryx^[7]
Khilok Formation	Aptian	Russia	Description
Khodzhakul Formation	Cenomanian	Uzbekistan	Description
Kimmeridge Clay	Late Jurassic	UK	Cuspicephalus^[8]
Kössen beds	Norian - Rhaetian	Switzerland	Description
Kota Formation	Hettangian - Pliensbachian	India	Campylognathoides
Kuwajima Formation	Valanginian	Japan	Description
La Amarga Formation	Hauterivian - Barremian	Argentina	Description
La Boca Formation	Middle Jurassic	Mexico	"Dimorphodon" weintraubi
La Cruz Formation	Aptian	Argentina	Pterodaustro
Lagarcito Formation	Albian	Argentina	Pterodaustro
Lance Formation	Maastrichtian	USA	Description
Lastres Formation	Kimmeridgian	Spain	Description
Lezas Formation^[9]	Aptian	Spain	Prejanopterus
Lianmuqin Formation	?Valanginian - Albian	China	Dsungaripterus, Lonchognathosaurus,^[10] Noripterus
"Lithographic Limestones"	Kimmeridgian	France	Description
Logbadjeck Formation	Campanian	Cameroon	Description
Lohan Cura Formation	Albian	Argentina	Description
Lower Chalk	Cenomanian	UK	Description
Lower Kimmeridgian Mudstones	Kimmeridgian	Germany	Description
Luohangdong Formation	?Valanginian - ?Albian	China	Description
Marne des Dives	Callovian	France	Description
Marnes rouges de Roquelongue	Maastrichtian	France	Description
Marnes Rouges Inférieures Formation	Maastrichtian	France	Description
Marnes d´Auzas Formation	Maastrichtian	France	Description
Melovatka Formation	Cenomanian	Russia	Description
Meng-Yin Formation	Kimmeridgian or Tithonian	China	Description
Merchantville Formation	Campanian	USA	Description
Mesaverde Group	Campanian	USA	Description
Middle Chalk	Cenomanian - Turonian	UK	Description
Middle Iser Shales	Turonian	Czech Republic	Description
Mifune Group	Cenomanian - Turonian	Japan	Description
Miria Formation	Maastrichtian	Australia	Description
Mishash Formation	Campanian	Israel	Description
Mornsheimer Limestone	Tithonian	Germany	Germanodactylus, Pterodactylus, "Pterodactylus" longicollum, Rhamphorhynchus
Mooreville Chalk	Santonian - Campanian	USA	Description
Morrison Formation	Oxfordian - Tithonian	USA	Description
Mowry Shale	Cenomanian	USA	Description
Murtoi Formation	Barremian - Aptian	Russia	Description
Niobrara Chalk	Coniacian - Campanian	USA	Dawndraco,^[11] Geosternbergia,^[11] Nyctosaurus, Pteranodon
North Horn Formation	Maastrichtian	USA	Description
Northumberland Formation^[12]	Campanian	Canada	Gwawinapterus
Nusplingen Limestone	Kimmeridgian	Germany	Cycnorhamphus, "Pterodactylus" longicollum, Rhamphorhynchus
Okurodani Formation	Berriasian	Japan	Description
Oncala Formation	Berriasian	Spain	Description
Öösh Formation	Berriasian - Valanginian	Mongolia	Description
Oxford Clay Formation	Callovian - Oxfordian	UK	Description
Patuxent Formation	Aptian	USA	Description
Paw Paw Formation	Albian	USA	Coloborhynchus
Pierre Shale	Campanian	USA	Pteranodon
Portezuelo Formation	Turonian - Coniacian	Argentina	Description
Posidonia Shale	Toarcian	Germany	Campylognathoides, Dorygnathus
Pudovinko Formation	Campanian	Russia	Description
"Purbeck"	Berriasian	Germany	Ctenochasma
Purbeck Beds	Tithonian - Berriasian	UK	Gnathosaurus, Plataleorhynchus
Qingshan Formation	Aptian - Albian	China	Description
Qiqu Formation	Oxfordian	China	Description
Quebrada Monardes Formation	Early Cretaceous	Chile	Domeykodactylus
Reuchenette Formation	Kimmeridgian	Switzerland	Description
Río Belgrano Formation	Barremian	Argentina	Description
Rybushka Formation	Campanian	Russia	Bogolubovia,^[13] Volgadraco^[14]
Sannine Formation	Cenomanian	Lebanon	Microtuban^[15]
Sânpetru Formation	Maastrichtian	Romania	Description
Santa Ana Formation	Probably Early Cretaceous	Chile	Description
Santana Formation	Cenomanian	Brazil	Unwindia^[16]
?Santa Rosa Formation	Carnian	USA	Description
Seefelder Beds	Norian	Austria	Description
Sekmenevka Formation	Aptian	Russia	Description
Sharp’s Hill Formation	Bathonian	UK	Description
Shishugou Formation	Middle - Late Jurassic	China	Description
?Sloan Canyon Formation	Norian - Rhaetian	USA	Description
Solnhofen Plattenkalk	Kimmeridgian - Tithonian	Germany	Anurognathus, Aurorazhdarcho,^[17] Ctenochasma, Cycnorhamphus, Germanodactylus, Gnathosaurus, Pterodactylus, "Pterodactylus" longicollum, Rhamphorhynchus, Scaphognathus
Solothurn Turtle Limestone	Kimmeridgian	Switzerland	Description
?Steinmergel Group	Norian - Rhaetian	Luxembourg	Description
Stonesfield Slate	Bathonian	UK	Description
Summerville Formation	Callovian - Oxfordian	USA	Description
Sundance Formation	Bathonian	USA	Description
?"Syren Bonebed"	Rhaetian	Luxembourg	Description
Tahora Formation	Campanian	New Zealand	Description
Tangshang Formation	Campanian	China	Zhejiangopterus
Tarrant Formation	Cenomanian	USA	Aetodactylus^[18]
Taynton Limestone Formation	Bathonian	UK	Description
Tendaguru Formation	Kimmeridgian - Tithonian	Tanzania	Tendaguripterus
Tiaojishan Formation	Bathonian - Oxfordian	China	Archaeoistiodactylus,^[19] Changchengopterus,^[20] Darwinopterus,^[21] Fenghuangopterus^[22] Jianchangopterus,^[23] Jianchangnathus^[24]
Tlayúa Formation	Albian	Mexico	Description
Toolebuc Formation	Albian	Australia	Aussiedraco,^[25] Mythunga^[26]
Toxaster Limestone	Hauterivian	France	Description
Tsagaantsav Svita	Berriasian - Valanginian	Mongolia	Noripterus
Turners Falls Formation	Early Jurassic	USA	Description
Two Medicine Formation	Santonian - Campanian	USA	Montanazhdarcho
Uhangri Formation	Santonian - Campanian	South Korea	Description
"Unnamed unit of fissure fills"	Norian	UK	Description
"Unnamed unit of fissure fills"	Hettangian or Sinemurian	UK	Description
Upper Chalk	Cenomanian - Turonian	UK	Description
Upper ‘couche III’, phosphate deposits	Maastrichtian	Morocco	Phosphatodraco
Upper Elliot Formation	Pliensbachian - Toarcian	South Africa	Description
Upper Greensand	Albian	UK	Ornithocheirus
Upper Sables de Glos	Oxfordian	France	Description
Vaca Muerta Formation	Tithonian	Argentina	Herbstosaurus
Vectis Formation	Barremian	UK	Istiodactylus
"Wealden"	Barremian	UK	Description
Wessex Formation	Barremian	UK	Caulkicephalus
White Chalk	Campanian	France	Description
White Chalk Formation	Coniacian	UK	Description
"Wierzbica Oolite and Platy Limestones"	Kimmeridgian	Poland	Description
Yalovach Formation	Santonian	Tajikistan	Description
Yezo Group	Santonian - Campanian	Japan	Description
Yixian Formation	Barremian - Aptian	China	Beipiaopterus, Boreopterus, Cathayopterus, Dendrorhynchoides, Elanodactylus,^[27] Eosipterus, Feilongus, Gegepterus, Gladocephaloideus,^[28] Haopterus, Ningchengopterus,^[29] Zhenyuanopterus^[30]
Zhirkindek Formation	Turonian - Coniacian	Kazakhstan	Description
Zorzino Limestone	Norian	Italy	Eudimorphodon, Peteinosaurus, ?Preondactylus
Züünbayan Formation	Aptian - Albian	Mongolia	Description

References

^ Buffetaut, E. (in press). "Samrukia nessovi, from the Late Cretaceous of Kazakhstan: A large pterosaur, not a giant bird." Annales de Paléontologie, published online before print 10-NOV-2011. doi:10.1016/j.annpal.2011.10.001
^ David M. Martill and David M. Unwin (2011) The world's largest toothed pterosaur, NHMUK R481, an incomplete rostrum of Coloborhynchus capito (Seeley 1870) from the Cambridge Greensand of England. Cretaceous Research (advance online publication) doi:10.1016/j.cretres.2011.09.003 http://www.sciencedirect.com/science/article/pii/S019566711100125X
^ J. F. Bonaparte, C. L. Schultz, and M. B. Soares. 2010. Pterosauria from the Late Triassic of southern Brazil. In S. Bandyopadhyay (ed.), New Aspects of Mesozoic Biodiversity, Lecture Notes in Earth Sciences 132:63-71.
^ Wang X.; Kellner, A. W. A.; Jiang S.; and Meng X. (2009). "An unusual long-tailed pterosaur with elongated neck from western Liaoning of China". Anais da Academia Brasileira de Ciências 81 (4): 793–812.
^ Robert M. Sullivan and Denver W. Fowler (2011). "Navajodactylus boerei, n. gen., n. sp., (Pterosauria, ?Azhdarchidae) from the Upper Cretaceous Kirtland Formation (upper Campanian) of New Mexico". Fossil Record 3. New Mexico Museum of Natural History and Science, Bulletin 53: 393–404. http://www.robertmsullivanphd.com/uploads/167._Sullivan_and_Fowler__Navajodactylus__COLOR.pdf.
^ Ibrahim, N., Unwin, D.M., Martill, D.M., Baidder, L. and Zouhri, S. (2010). "A New Pterosaur (Pterodactyloidea: Azhdarchidae) from the Upper Cretaceous of Morocco." PLoS ONE, 5(5): e10875. doi:10.1371/journal.pone.0010875
^ Rodrigues, T. and Kellner, A.W.A. (2008). "Review of the pterodactyloid pterosaur Colobrohynchus." Pp. 219–228 in: Hone, D.W.E. and Buffetaut, E. (eds), Flugsaurier: pterosaur papers in honour of Peter Wellnhofer. Zitteliana B, 28.
^ David M. Martill and Steve Etches (2011). "A new monofenestratan pterosaur from the Kimmeridge Clay Formation (Upper Jurassic, Kimmeridgian) of Dorset, England". Acta Palaeontologica Polonica in press. doi:10.4202/app.2011.0071. http://www.app.pan.pl/archive/published/app56/app20110071_acc.pdf.
^ Fuentes Vidarte, C., Meijide Calvo, M. (2010). "Un nuevo pterosaurio (Pterodactyloidea) en el Cretácico Inferior de La Rioja (España) (A new pterosaur (Pterodactyloidea) from the Lower Cretaceous of La Rioja (Spain))". Boletín Geológico y Minero 121 (3): 311–328. http://www.igme.es/internet/boletin/2010/121_3/ARTICULO%206.pdf.
^ Maisch, M.W., Matzke, A.T., and Ge Sun. (2004). A new dsungaripteroid pterosaur from the Lower Cretaceous of the southern Junggar Basin, north-west China. Cretaceous Research 25:625-634.
^ ^a ^b Kellner, A.W.A. (2010). "Comments on the Pteranodontidae (Pterosauria, Pterodactyloidea) with the description of two new species". Anais da Academia Brasileira de Ciências 82 (4): 1063–1084. doi:10.1590/S0001-37652010000400025. http://www.scielo.br/pdf/aabc/v82n4/25.pdf.
^ Victoria M. Arbour; Philip J. Currie (2011). "An istiodactylid pterosaur from the Upper Cretaceous Nanaimo Group, Hornby Island, British Columbia, Canada". Canadian Journal of Earth Sciences 48 (1): 63–69. doi:10.1139/E10-083. http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=eng&journal=cjes&volume=48&year=2011&issue=1&msno=e10-083.
^ Bogolubov, N.N. (1914). "O pozvonk’ pterodaktilya uz’ vyerkhnyem’lovyikh’ otlozhyenii Saratovskoi gubyernii. [On a pterodactyle vertebra from Upper Cretaceous deposits of the Government of Saratoff]." Annuaire geologique et mineralogique de la Russie, 16(1): 1-7. (Russian text, French resume).
^ Averianov, A.O.; Arkhangelsky, M.S.; and Pervushov, E.M. (October 2008). "A New Late Cretaceous Azhdarchid (Pterosauria, Azhdarchidae) from the Volga Region". Paleontological Journal 42 (6): 634–642. doi:10.1134/S0031030108060099.
^ Ross A. Elgin and Eberhard Frey (2011). "A new azhdarchoid pterosaur from the Cenomanian (Late Cretaceous) of Lebanon". Swiss Journal of Geosciences in press. doi:10.1007/s00015-011-0081-1.
^ David M. Martill (2011). "A new pterodactyloid pterosaur from the Santana Formation (Cretaceous) of Brazil". Cretaceous Research 32 (2): 236–243. doi:10.1016/j.cretres.2010.12.008. http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WD3-51PH16S-6&_user=10&_coverDate=12%2F14%2F2010&_rdoc=6&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info(%23toc%236755%239999%23999999999%2399999%23FLA%23display%23Articles)&_cdi=6755&_sort=d&_docanchor=&_ct=19&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=40192b874da627b583ec101ce91792a3&searchtype=a.
^ Eberhard Frey, Christian A. Meyer and Helmut Tischlinger (2011). "The oldest azhdarchoid pterosaur from the Late Jurassic Solnhofen Limestone (Early Tithonian) of Southern Germany". Swiss Journal of Geosciences in press. doi:10.1007/s00015-011-0073-1.
^ Myers, Timothy S. (2010). "A new ornithocheirid pterosaur from the Upper Cretaceous (Cenomanian–Turonian) Eagle Ford Group of Texas" (pdf). Journal of Vertebrate Paleontology 30 (1): 280–287. doi:10.1080/02724630903413099. http://pdfserve.informaworld.com/929241__918962831.pdf.
^ Lü Junchang and Fucha Xiaohui (2011). "A new pterosaur (Pterosauria) from Middle Jurassic Tiaojishan Formation of western Liaoning, China". Global Geology Z1: 113–118.
^ Lü, J. (2009). "A new non-pterodactyloid pterosaur from Qinglong County, Hebei Province of China". Acta Geologica Sinica (English Edition) 83 (2): 189–199. doi:10.1111/j.1755-6724.2009.00062.x.
^ Lü, J.; Unwin, D.M.; Jin, X.; Liu, Y.; Ji, Q. (2010). "Evidence for modular evolution in a long-tailed pterosaur with a pterodactyloid skull". Proceedings of the Royal Society B 277 (1680): 383–389. doi:10.1098/rspb.2009.1603. PMC 2842655. PMID 19828548. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2842655.
^ Lu, J.; Fucha, X.; Chen, J. (2010). "A new scaphognathine pterosaur from the Middle Jurassic of western Liaoning, China". Acta Geoscientica Sinica 31 (2): 263–266.
^ Lü Junchang and Bo Xue (2011). "A New Rhamphorhynchid Pterosaur (Pterosauria) from the Middle Jurassic Tiaojishan Formation of Western Liaoning, China". Acta Geologica Sinica 85 (5): 977–983. http://www.geojournals.cn/dzxben/ch/reader/view_abstract.aspx?file_no=201105002&flag=1.
^ Xin Cheng, Xiaolin Wang, Shunxing Jiang and Alexander W.A. Kellner (2012). "A new scaphognathid pterosaur from western Liaoning, China". Historical Biology in press. doi:10.1080/08912963.2011.635423. http://www.tandfonline.com/doi/abs/10.1080/08912963.2011.635423.
^ Kellner, Alexander W.A.; Taissa Rodrigues and Fabiana R. Costa (2011). "Short note on a pteranodontoid pterosaur (Pterodactyloidea) from western Queensland, Australia". Anais da Academia Brasileira de Ciências 83 (1): 301–308. doi:10.1590/S0001-37652011000100018. http://www.scielo.br/pdf/aabc/v83n1/v83n1a18.pdf.
^ Molnar, Ralph E.; and Thulborn, R.A. (2008). "An incomplete pterosaur skull from the Cretaceous of north-central Queensland, Australia". Arquivos do Museu Nacional, Rio de Janeiro 65 (4): 461–470.
^ Andres, B.; and Ji Q. (2008). "A new pterosaur from the Liaoning Province of China, the phylogeny of the Pterodactyloidea, and convergence in their cervical vertebrae". Palaeontology 51 (2): 453–469. doi:10.1111/j.1475-4983.2008.00761.x.
^ Lü Junchang, Ji Qiang, Wei Xuefang and Liu Yongqing (2011). "A new ctenochasmatoid pterosaur from the Early Cretaceous Yixian Formation of western Liaoning, China". Cretaceous Research in press. doi:10.1016/j.cretres.2011.09.010. http://www.sciencedirect.com/science/article/pii/S0195667111001327.
^ Lü J. (2009). "A baby pterodactyloid pterosaur from the Yixian Formation of Ningcheng, Inner Mongolia, China". Acta Geologica Sinica 83 (1): 1–8. doi:10.1111/j.1755-6724.2009.00001.x.
^ Lü, J. (2010). "A new boreopterid pterodactyloid pterosaur from the Early Cretaceous Yixian Formation of Liaoning Province, northeastern China". Acta Geologica Sinica 24: 241–246.

Barrett, P.M., Butler, R.J., Edwards, N.P., & Milner, A.R. Pterosaur distribution in time and space: an atlas. p61-107. in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer. 2008. Hone, D.W.E., and Buffetaut, E. (eds). Zitteliana B, 28. 264pp.[1]
The Pterosaur Database

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List of pterosaur-bearing stratigraphic units

See also

References