List of plesiosaur-bearing stratigraphic units

Group or Formation Period Country Notes
Adaffa FormationCretaceous Saudi Arabia
Agardhfjellet FormationJurassic Norway
Agrio FormationCretaceous Argentina
Akrabou FormationCretaceous Morocco
Allaru Mudstone FormationCretaceous Australia
Allen FormationCretaceous Argentina
Alum Shale FormationJurassic United Kingdom
Ampthill Clay FormationJurassic United Kingdom
Ancholme Group/Kimmeridge Clay FormationJurassic United Kingdom
Ancholme Group/Oxford Clay FormationJurassic France
 United Kingdom
Arauco Group/Quiriquina FormationCretaceous Chile
Arcillas de Morella FormationCretaceous Spain
Arctic Red FormationCretaceous Canada
Argiles de Châtillon FormationJurassic France
Argiles de Montaubert FormationJurassic France
Argille Varicolori FormationCretaceous Italy
Artemesia FormationJurassic Cuba
Artoles FormationCretaceous Spain
Ashville FormationCretaceous Canada
Balqa Group/Phosphorite Unit FormationCretaceous Jordan
Barrow FormationCretaceous Australia
Barrow Group/Birdrong Sandstone FormationCretaceous Australia
Bearpaw FormationCretaceous Canada
 United States
Bearpaw Shale FormationCretaceous United States
Belly River FormationCretaceous Canada
Belly River Group/Dinosaur Park FormationCretaceous Canada
Bissekty FormationCretaceous Uzbekistan
Blue Lias FormationJurassic United Kingdom
Braunjura Group/Braunjura alpha & Braunjura beta FormationJurassic France
Bückeberg FormationCretaceous Germany
Calcaire de Caen FormationJurassic France
Calcaire à Bélemnites FormationJurassic France
Calcaires de MoulinFormationJurassic France
Calcaires à Spatangues FormationCretaceous France
Calcareous Grit FormationJurassic United Kingdom
Carlile Shale FormationCretaceous United States
Chalk FormationCretaceous United Kingdom
Chalk Group/"Upper Chalk" FormationCretaceous United Kingdom
Chalk Group/Lower Chalk FormationCretaceous United Kingdom
Chalk Group/LowerFormationCretaceous United Kingdom
Chalk Group/LowerFormationCretaceous United Kingdom
Champion Bay Group/Colalura Sandstone FormationJurassic Australia
Charmouth Mudstone FormationJurassic United Kingdom
Chico FormationCretaceous United States
Chico Group/Moreno FormationCretaceous United States
Clearwater FormationCretaceous Canada
Colorado Group/Belle Fourche FormationCretaceous Canada
 United States
Colorado Group/Carlile Shale FormationCretaceous United States
Colorado Group/Graneros Shale FormationCretaceous United States
Colorado Group/Greenhorn Limestone FormationCretaceous United States
Colorado Group/Niobrara FormationCretaceous Canada
 United States
Conway FormationCretaceous New Zealand
Conway Siltstone FormationCretaceous New Zealand
Coon Creek FormationCretaceous United States
Coral Rag FormationJurassic United Kingdom
Corallian Oolite FormationJurassic United Kingdom
Corallian Group/Coral Rag FormationJurassic United Kingdom
Corallian Group/Kingston FormationJurassic United Kingdom
Couche III FormationCretaceous Morocco
Cuyo Group/Los Molles FormationJurassic Argentina
Dinosaur Park FormationCretaceous Canada
Dorotea FormationCretaceous Chile
Duwi FormationCretaceous Egypt
Eagle Ford FormationCretaceous United States
Eagle Ford Group/Britton FormationCretaceous United States
Estratos de Quebrada Municipalidad FormationCretaceous Chile
Eutaw FormationCretaceous United States
Evergreen FormationJurassic Australia
Favel FormationCretaceous Canada
Fernie FormationJurassic Canada
Frontier FormationCretaceous United States
Futaba Group/Ashizawa FormationCretaceous Japan
Futaba Group/Tamayama FormationCretaceous Japan
Great Estuarine FormationJurassic United Kingdom
Great Estuarine Series Group/Estheria Shales FormationJurassic United Kingdom
Great Estuarine Group/Lealt Shale FormationJurassic United Kingdom
Great Oolite FormationJurassic France
Gres de Mortinsart FormationTriassic Belgium
Grès de Infralias FormationTriassic France
Grünsandstein FormationCretaceous Germany
Hailey Shales FormationCretaceous United States
Hasle FormationJurassic Denmark
Hastings FormationCretaceous United Kingdom
Hastings Beds Group/Wadhurst Clay FormationCretaceous United Kingdom
Hell Creek FormationCretaceous United States
Hiccles Cove FormationJurassic Canada
Hornerstown FormationCretaceous United States
Isachsen FormationCretaceous Canada
Itapecuru FormationCretaceous Brazil
Alcântara FormationCretaceous Brazil
Jagua FormationJurassic Cuba
Jagüel FormationCretaceous Argentina
Judith River FormationCretaceous Canada
 United States
Kajlâka FormationCretaceous Bulgaria
Kangauz FormationCretaceous Russian Federation
Kanguk FormationCretaceous Canada
Katiki FormationCretaceous New Zealand
Katrol FormationJurassic India
Kimmeridge Clay FormationJurassic France
 United Kingdom
Kunrade FormationCretaceous Netherlands
La Cabana FormationCretaceous Spain
La Caja FormationJurassic Mexico
La Casita FormationJurassic Mexico
La Colonia FormationCretaceous Argentina
La Luna FormationCretaceous Venezuela
Lajas FormationJurassic Argentina
Lake Waco FormationCretaceous United States
Laramie FormationCretaceous United States
Lias FormationJurassic United Kingdom
Lias FormationJurassic United Kingdom
Lias Group/Blue Lias FormationJurassic United Kingdom
Lias Group/Charmouth Mudstone FormationJurassic United Kingdom
Lias Group/Dyrham FormationJurassic United Kingdom
Lias Group/Marlstone Rock FormationJurassic United Kingdom
Lias Group/Scunthorpe Mudstone FormationTriassic United Kingdom
Lias Group/Waterloo Mudstone FormationJurassic United Kingdom
Lias Group/Whitby Mudstone FormationJurassic United Kingdom
Lopez de Bertodano FormationCretaceous Antarctica
Los Alamitos FormationCretaceous Argentina
Lower Chalk Group/Cambridge Greensand FormationCretaceous United Kingdom
Lower Green Sand FormationCretaceous Russian Federation
Lower Greensand Group/Faringdon Sand FormationCretaceous United Kingdom
Lower Greensand Group/Hythe FormationCretaceous United Kingdom
Luxembourg Sandstone FormationJurassic Luxembourg
López de Bertodano FormationCretaceous Antarctica
Maaree Group/Bulldog Shale FormationCretaceous Australia
Maastricht FormationCretaceous Belgium
 Netherlands
Malargue Group/Roca FormationCretaceous Argentina
Malargüe FormationCretaceous Argentina
Malargüe Group/Allen FormationCretaceous Argentina
Malargüe Group/Loncoche FormationCretaceous Argentina
Mannville Group/Clearwater FormationCretaceous Canada
Marambio Group/Snow Hill Island FormationCretaceous Antarctica
Marnes de Dives FormationJurassic France
Marnes de Gravelotte (=La Gravclotte Marls) FormationJurassic France
Marree Group/Bulldog Shale FormationCretaceous Australia
Mata Amarilla FormationCretaceous Argentina
Mata Group/Tahora FormationCretaceous New Zealand
Melovatka FormationCretaceous Russian Federation
Mesaverde FormationCretaceous United States
Middle Keuper Group/Knollenmergel FormationTriassic  Switzerland
Middle Keuper Group/Trossingen FormationTriassic Germany
Middle Yezo FormationCretaceous Japan
Middle Yezo Group/Chenaibo FormationCretaceous Japan
Molecap GreensandCretaceous Australia
Monmouth Group/Navesink FormationCretaceous United States
Mont FormationJurassic France
Montana Group/Pierre Shale FormationCretaceous United States
Moreno FormationCretaceous United States
Navesink FormationCretaceous United States
Nekum FormationCretaceous Netherlands
Neuquén Group/Anacleto FormationCretaceous Argentina
Newcastle FormationTriassic New Zealand
Niobrara FormationCretaceous United States
Otway Group/Eumeralla FormationCretaceous Australia
Oxford Clay FormationJurassic United Kingdom
Paja FormationCretaceous Colombia
Paso del Sapo FormationCretaceous Argentina
Penarth Group/Westbury FormationTriassic United Kingdom
Penarth Group/White Lias FormationTriassic United Kingdom
Pender FormationCretaceous Canada
Pernarth Group/Westbury FormationTriassic United Kingdom
Pierre Shale FormationCretaceous Canada
 United States
Point Lookout FormationCretaceous United States
Portland Oolite FormationJurassic United Kingdom
Portland Group/Portland Stone FormationJurassic United Kingdom
Posidonia ShaleJurassic Germany
Purbeck FormationCretaceous, Jurassic United Kingdom
Purbeck Group/Lulworth FormationCretaceous, Jurassic United Kingdom
Puskwaskau FormationCretaceous Canada
Querecual FormationCretaceous Venezuela
Quiriquina FormationCretaceous Chile
Raritan FormationCretaceous United States
Razorback Beds FormationJurassic Australia
Rio del Lago FormationTriassic Italy
Rodiles FormationJurassic Spain
Rolling Downs Group/Griman Creek FormationCretaceous Australia
Rolling Downs Group/Toolebuc FormationCretaceous Australia
Rolling Downs Group/Wallumbilla FormationCretaceous Australia
Rolling Downs Group/Winton FormationCretaceous Australia
Rosablanca FormationCretaceous Colombia
Rosso Ammonitico Veronese FormationJurassic Italy
Rybushka FormationCretaceous Russian Federation
Sables de Glos FormationJurassic France
Saint FormationCretaceous Belgium
Santa Marta FormationCretaceous Antarctica
Savel'evsk oil shales FormationJurassic Russian Federation
Scalpa Sandstone FormationJurassic United Kingdom
Selborne Group/Upper Greensand FormationCretaceous United Kingdom
Selma Group/Mooreville Chalk FormationCretaceous United States
Severn FormationCretaceous United States
Snow Hill Island FormationCretaceous Antarctica
Speeton Clay FormationCretaceous United Kingdom
Spilsby Sandstone FormationJurassic United Kingdom
Staffin Bay FormationJurassic United Kingdom
Strzelecki Group/Wonthaggi FormationCretaceous Australia
Sundance FormationJurassic United States
São Gião FormationJurassic Portugal
Tadi Beds FormationCretaceous Angola
Taylor Marl' FormationCretaceous United States
Tessé Sandstones FormationJurassic France
Thermopolis Shale FormationCretaceous United States
Tioriori Group/Takatika Grit FormationCretaceous New Zealand
Toolebuc FormationCretaceous Australia
Tropic Shale FormationCretaceous United States
Trossingen FormationTriassic  Switzerland
Tugulu Group/Lianmugin FormationCretaceous China
Uitenhage series FormationCretaceous South Africa
Uitenhage Group/Sundays River FormationCretaceous South Africa
Upper Chalk FormationCretaceous United Kingdom
Upper Gondwana Group/Umia FormationJurassic India
Upper Greensand FormationCretaceous United Kingdom
Upper Keuper Group/Exter FormationTriassic Germany
Vaca Muerta FormationCretaceous, Jurassic Argentina
Vermillion River FormationCretaceous Canada
Wallumbilla FormationCretaceous Australia
Waterloo FormationJurassic United Kingdom
Weald Clay Group/Upper Weald Clay FormationCretaceous United Kingdom
Wealden Group/Tunbridge Wells Sand FormationCretaceous United Kingdom
Wealden Group/Vectis FormationCretaceous United Kingdom
Whitby Mudstone FormationJurassic United Kingdom
Wilczek FormationTriassic Russian Federation
Wilgunya Group/Toolebuc FormationCretaceous Australia
Wilhelmøya FormationTriassic Norway
Xiashaximiao FormationJurassic China
Ziliujing FormationJurassic China
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