[F] Cleveland-Lloyd Dinosaur Quarry - Utah - US
Utah - US
Located in the Brushy Basin Member of the Morrison Formation (Tithonian), the Cleveland-Lloyd Dinosaur Quarry represents one of the most impressive dinosaur mass accumulations known. The site, is located in Emery County in east-central Utah. The quarry sits whitin a gray calcareous claystone, floodplain deposit crapped by a micritic limestone and a volcanic ash (Bilbey, 1992, 1993). The preliminary interpretation of the paleoenvironment is a groundwater-fed wetland (Bilbey, 1992, 1993).
It differs from may other mass essamblages (e.g., Drestler, 1995) in that the animals found do not appear to be allochthonous, water-transported carcasses. The remains found at the quarry are mostly disarticulated, and are commonly broken.
[Bilbey, S.A. 1998. Cleveland-Lloyd dinosaur quarry - age, stratigraphy and depositional environments. Modern Geology 222: 87-120.]
\\\"The layer is a lake deposit, and there is strong indication of volcaniclastic sediment. There is no single clear explanation for the death assemblage, however.Dodson et al.\\\'s idea of it being an oxbow lake is not supported by the sedimentological evidence: the layers immediately below the lake are paleosols. Periodic minor flooding was not large enough to have been catastrophic. Possibly an influx of the volcaniclastic debries might have temporarily absorbed the water of the lake, leaving a restricted body. There is evidence of scavenging and trampling of the carcasses.\\\"
Allosaurus fragilis - Carnosauria Allosauridae - Jurassic Late Kimmeridgian Tithonian
Camarasaurus lentus - Camarasauridae Camarasaurinae - Jurassic Late Kimmeridgian Tithonian
Ceratosaurus willisobrienorum - Ceratosauria Nomina Dubia - Jurassic Late Kimmeridgian Tithonian
Marshosaurus bicentesimus - Incertae Sedis \\\"Carnosaurs\\\" - Jurassic Late Kimmeridgian Tithonian
Stegosaurus stenops - Stegosauria Stegosauridae - Jurassic Late Kimmeridgian Tithonian
Stokesosaurus clevelandi - Tetanurae ?Carnosauria - Jurassic Late Kimmeridgian Tithonian
Located in the Brushy Basin Member of the Morrison Formation (Tithonian), the Cleveland-Lloyd Dinosaur Quarry represents one of the most impressive dinosaur mass accumulations known. The site, is located in Emery County in east-central Utah. The quarry sits whitin a gray calcareous claystone, floodplain deposit crapped by a micritic limestone and a volcanic ash (Bilbey, 1992, 1993). The preliminary interpretation of the paleoenvironment is a groundwater-fed wetland (Bilbey, 1992, 1993).
It differs from may other mass essamblages (e.g., Drestler, 1995) in that the animals found do not appear to be allochthonous, water-transported carcasses. The remains found at the quarry are mostly disarticulated, and are commonly broken.
[Bilbey, S.A. 1998. Cleveland-Lloyd dinosaur quarry - age, stratigraphy and depositional environments. Modern Geology 222: 87-120.]
\\\"The layer is a lake deposit, and there is strong indication of volcaniclastic sediment. There is no single clear explanation for the death assemblage, however.Dodson et al.\\\'s idea of it being an oxbow lake is not supported by the sedimentological evidence: the layers immediately below the lake are paleosols. Periodic minor flooding was not large enough to have been catastrophic. Possibly an influx of the volcaniclastic debries might have temporarily absorbed the water of the lake, leaving a restricted body. There is evidence of scavenging and trampling of the carcasses.\\\"
Allosaurus fragilis - Carnosauria Allosauridae - Jurassic Late Kimmeridgian Tithonian
Camarasaurus lentus - Camarasauridae Camarasaurinae - Jurassic Late Kimmeridgian Tithonian
Ceratosaurus willisobrienorum - Ceratosauria Nomina Dubia - Jurassic Late Kimmeridgian Tithonian
Marshosaurus bicentesimus - Incertae Sedis \\\"Carnosaurs\\\" - Jurassic Late Kimmeridgian Tithonian
Stegosaurus stenops - Stegosauria Stegosauridae - Jurassic Late Kimmeridgian Tithonian
Stokesosaurus clevelandi - Tetanurae ?Carnosauria - Jurassic Late Kimmeridgian Tithonian