List of plesiosaur-bearing stratigraphic units

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Group or Formation Period Country Notes
Adaffa Formation Cretaceous  Saudi Arabia
Agardhfjellet Formation Jurassic  Norway
Agrio Formation Cretaceous  Argentina [citation needed]
Cretaceous  Morocco
Allaru Mudstone Formation Cretaceous  Australia
Allen Formation Cretaceous  Argentina
Alum Shale Formation Jurassic  United Kingdom
Ampthill Clay Formation Jurassic  United Kingdom
Ancholme Group/Kimmeridge Clay Formation Jurassic  United Kingdom
Ancholme Group/Oxford Clay Formation Jurassic  France
 United Kingdom
/Quiriquina Formation Cretaceous  Chile
Arcillas de Morella Formation Cretaceous  Spain
Cretaceous  Canada
Argiles de Châtillon Formation Jurassic  France
Jurassic  France
Cretaceous  Italy
Artemesia Formation Jurassic  Cuba
Artoles Formation Cretaceous  Spain
Ashville Formation Cretaceous  Canada
/ Cretaceous  Jordan
Cretaceous  Australia
/ Cretaceous  Australia
Bearpaw Formation Cretaceous  Canada
 United States
Bearpaw Shale Formation Cretaceous  United States
Belly River Formation Cretaceous  Canada
Belly River Group/Dinosaur Park Formation Cretaceous  Canada
Bissekty Formation Cretaceous  Uzbekistan
Blue Lias Formation Jurassic  United Kingdom
Braunjura Group/ Jurassic  France
Bückeberg Formation Cretaceous  Germany
Calcaire de Caen Formation Jurassic  France
Jurassic  France
Jurassic  France
Cretaceous  France
Jurassic  United Kingdom
Cretaceous  United States
Chalk Formation Cretaceous  United Kingdom
Chalk Group/ Cretaceous  United Kingdom
Chalk Group/Lower Chalk Formation Cretaceous  United Kingdom
Chalk Group/ Cretaceous  United Kingdom
Chalk Group/ Cretaceous  United Kingdom
Champion Bay Group/Colalura Sandstone Formation Jurassic  Australia
Charmouth Mudstone Formation Jurassic  United Kingdom
Chico Formation Cretaceous  United States
Chico Group/Moreno Formation Cretaceous  United States
Clearwater Formation Cretaceous  Canada
Colorado Group/Belle Fourche Formation Cretaceous  Canada
 United States
Colorado Group/ Cretaceous  United States
Colorado Group/ Cretaceous  United States
Colorado Group/ Cretaceous  United States
Colorado Group/Niobrara Formation Cretaceous  Canada
 United States
Conway Formation Cretaceous  New Zealand
Conway Siltstone Formation Cretaceous  New Zealand
Coon Creek Formation Cretaceous  United States
Coral Rag Formation Jurassic  United Kingdom
Corallian Oolite Formation Jurassic  United Kingdom
Corallian Group/Coral Rag Formation Jurassic  United Kingdom
Corallian Group/Kingston Formation Jurassic  United Kingdom
Cretaceous  Morocco
Cuyo Group/Los Molles Formation Jurassic  Argentina
Dinosaur Park Formation Cretaceous  Canada
Dorotea Formation Cretaceous  Chile
Cretaceous  Egypt
Eagle Ford Formation Cretaceous  United States
Eagle Ford Group/Britton Formation Cretaceous  United States
Cretaceous  Chile
Eutaw Formation Cretaceous  United States
Evergreen Formation Jurassic  Australia
Favel Formation Cretaceous  Canada
Fernie Formation Jurassic  Canada
Frontier Formation Cretaceous  United States
Futaba Group/Ashizawa Formation Cretaceous  Japan
Futaba Group/Tamayama Formation Cretaceous  Japan
Jurassic  United Kingdom
/Estheria Shales Formation Jurassic  United Kingdom
Great Estuarine Group/Lealt Shale Formation Jurassic  United Kingdom
Great Oolite Formation Jurassic  France
Triassic  Belgium
Triassic  France
Grünsandstein Formation Cretaceous  Germany
Hailey Shales Formation Cretaceous  United States
Hasle Formation Jurassic  Denmark
Hastings Formation Cretaceous  United Kingdom
Hastings Beds Group/Wadhurst Clay Formation Cretaceous  United Kingdom
Hell Creek Formation Cretaceous  United States
Hiccles Cove Formation Jurassic  Canada
Hornerstown Formation Cretaceous  United States
Isachsen Formation Cretaceous  Canada
Itapecuru Formation Cretaceous  Brazil
Alcântara Formation Cretaceous  Brazil
Jagua Formation Jurassic  Cuba
Jagüel Formation Cretaceous  Argentina
Judith River Formation Cretaceous  Canada
 United States
Cretaceous  Bulgaria
Cretaceous  Russian Federation
Kanguk Formation Cretaceous  Canada
Katiki Formation Cretaceous  New Zealand
Katrol Formation Jurassic  India
Kimmeridge Clay Formation Jurassic  France
 United Kingdom
Cretaceous  Netherlands
Cretaceous  Spain
La Caja Formation Jurassic  Mexico
La Casita Formation Jurassic  Mexico
La Colonia Formation Cretaceous  Argentina
Cretaceous  Venezuela
Jurassic  Argentina
Lake Waco Formation Cretaceous  United States
Laramie Formation Cretaceous  United States
Lias Formation Jurassic  United Kingdom
Lias Formation Jurassic  United Kingdom
Lias Group/Blue Lias Formation Jurassic  United Kingdom
Lias Group/Charmouth Mudstone Formation Jurassic  United Kingdom
Lias Group/Dyrham Formation Jurassic  United Kingdom
Lias Group/Marlstone Rock Formation Jurassic  United Kingdom
Lias Group/ Triassic  United Kingdom
Lias Group/ Jurassic  United Kingdom
Lias Group/Whitby Mudstone Formation Jurassic  United Kingdom
Lopez de Bertodano Formation Cretaceous  Antarctica
Los Alamitos Formation Cretaceous  Argentina
/Cambridge Greensand Formation Cretaceous  United Kingdom
Cretaceous  Russian Federation
Lower Greensand Group/ Cretaceous  United Kingdom
Lower Greensand Group/Hythe Formation Cretaceous  United Kingdom
Luxembourg Sandstone Formation Jurassic  Luxembourg
López de Bertodano Formation Cretaceous  Antarctica
/ Cretaceous  Australia
Maastricht Formation Cretaceous  Belgium
 Netherlands
Malargue Group/Roca Formation Cretaceous  Argentina
Cretaceous  Argentina
Malargüe Group/Allen Formation Cretaceous  Argentina
Malargüe Group/ Cretaceous  Argentina
Mannville Group/Clearwater Formation Cretaceous  Canada
/Snow Hill Island Formation Cretaceous  Antarctica
Marnes de Dives Formation Jurassic  France
Jurassic  France
/ Cretaceous  Australia
Mata Amarilla Formation Cretaceous  Argentina
/Tahora Formation Cretaceous  New Zealand
Melovatka Formation Cretaceous  Russian Federation
Mesaverde Formation Cretaceous  United States
/ Triassic   Switzerland
/Trossingen Formation Triassic  Germany
Cretaceous  Japan
/ Cretaceous  Japan
Molecap Greensand Cretaceous  Australia
Monmouth Group/Navesink Formation Cretaceous  United States
Mont Formation Jurassic  France
Montana Group/Pierre Shale Formation Cretaceous  United States
Moreno Formation Cretaceous  United States
Navesink Formation Cretaceous  United States
Cretaceous  Netherlands
Neuquén Group/Anacleto Formation Cretaceous  Argentina
Newcastle Formation Triassic  New Zealand
Niobrara Formation Cretaceous  United States
/Eumeralla Formation Cretaceous  Australia
Oxford Clay Formation Jurassic  United Kingdom
Paja Formation Cretaceous  Colombia
Paso del Sapo Formation Cretaceous  Argentina
Penarth Group/Westbury Formation Triassic  United Kingdom
Penarth Group/ Triassic  United Kingdom
Pender Formation Cretaceous  Canada
/Westbury Formation Triassic  United Kingdom
Pierre Shale Formation Cretaceous  Canada
 United States
Point Lookout Formation Cretaceous  United States
Jurassic  United Kingdom
Portland Group/Portland Stone Formation Jurassic  United Kingdom
Posidonia Shale Jurassic  Germany
Purbeck Formation Cretaceous, Jurassic  United Kingdom
Purbeck Group/Lulworth Formation Cretaceous, Jurassic  United Kingdom
Puskwaskau Formation Cretaceous  Canada
Cretaceous  Venezuela
Quiriquina Formation Cretaceous  Chile
Raritan Formation Cretaceous  United States
Jurassic  Australia
Triassic  Italy
Jurassic  Spain
Rolling Downs Group/Griman Creek Formation Cretaceous  Australia
Rolling Downs Group/Toolebuc Formation Cretaceous  Australia
Rolling Downs Group/Wallumbilla Formation Cretaceous  Australia
Rolling Downs Group/Winton Formation Cretaceous  Australia
Rosablanca Formation Cretaceous  Colombia
Jurassic  Italy
Rybushka Formation Cretaceous  Russian Federation
Jurassic  France
Cretaceous  Belgium
Santa Marta Formation Cretaceous  Antarctica
Jurassic  Russian Federation
Jurassic  United Kingdom
Selborne Group/Upper Greensand Formation Cretaceous  United Kingdom
Selma Group/Mooreville Chalk Formation Cretaceous  United States
Severn Formation Cretaceous  United States
Snow Hill Island Formation Cretaceous  Antarctica
Speeton Clay Formation Cretaceous  United Kingdom
Jurassic  United Kingdom
Staffin Bay Formation Jurassic  United Kingdom
Strzelecki Group/Wonthaggi Formation Cretaceous  Australia
Sundance Formation Jurassic  United States
Jurassic  Portugal
Cretaceous  Angola
Cretaceous  United States
Jurassic  France
Cretaceous  United States
/ Cretaceous  New Zealand
Toolebuc Formation Cretaceous  Australia
Tropic Shale Formation Cretaceous  United States
Trossingen Formation Triassic   Switzerland
Tugulu Group/Lianmugin Formation Cretaceous  China
Cretaceous  South Africa
Uitenhage Group/Sundays River Formation Cretaceous  South Africa
Cretaceous  United Kingdom
/ Jurassic  India
Upper Greensand Formation Cretaceous  United Kingdom
/Exter Formation Triassic  Germany
Vaca Muerta Formation Cretaceous, Jurassic  Argentina
Vermillion River Formation Cretaceous  Canada
Wallumbilla Formation Cretaceous  Australia
Jurassic  United Kingdom
Weald Clay Group/ Cretaceous  United Kingdom
Wealden Group/Tunbridge Wells Sand Formation Cretaceous  United Kingdom
Wealden Group/Vectis Formation Cretaceous  United Kingdom
Whitby Mudstone Formation Jurassic  United Kingdom
Triassic  Russian Federation
/Toolebuc Formation Cretaceous  Australia
Wilhelmøya Formation Triassic  Norway
Xiashaximiao Formation Jurassic  China
Ziliujing Formation Jurassic  China
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