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Cleveland Lloyd Quarry[edit]

About 155 million years ago, in the Late Jurassic the territory of what is now Cleveland Lloyd Dinosaur Quarry was a freshwater lake bed. Multiple species came to drink here (ref 1). And they got stuck. [1][2]

It was a time of drought, and the water levels in the lake shrank very rapidly. The upper layer of mud was left hard, but the lower, became wet and sticky. The weight of the dinosaurs causes them to break the upper crust, and that's when they become mired in mud. It is also called a "predator trap".

Paleobiota[edit]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Theropods reported from the Cleveland-Lloyd Quarry
Genus Species Amount Notes Images

Marshosaurus

M.bicentesimus

2

A small (6m)megalosauridae

Torvosaurus

T.tanneri

1

The second laregest theropod reported from the Quarry.

Torvosaurus

Stokesosaurus

S.clevelandi

3

The largest coelurosaur found

Ornitholestes

Indeterminate

1

-

Allosaurus[3]

A.fragilis

44 - 60

The largest theropod found

Allosaurus mounted skeleton

Ceratosaurus

C.nasicornis

1

The rarest theropod species in the quarry

Sauropods reported from the Cleveland-Lloyd Quarry
Genus Species Notes Images

Camarasaurus

C.lentus

3 skeletons were unearthed

Camarasaurus

Barosaurus

B.lentus

-

Amphicoelias

A.altus

A smaller cousin of A.fragilimus

-

Mongolosaurus

cf Indeterminate

-

-

Brachiosaurus

B.althithorax

The largest dinosaur reported

Brachiosaurus

Haplocanthosaurus

H.priscus

The last Cetiosauridae

-

Ornithischians reported from the Cleveland-Lloyd Quarry
Genus Species Notes Images

Camptosaurus

C.dispar

-

-

Stegosaurus

S.stenops

The largest ornithischian of his time

Stegosaurus

Footnotes[edit]

  1. ^ TERRY A. GATES. The Late Jurassic Cleveland-Lloyd Dinosaur Quarry as a Drought-Induced Assemblage.
  2. ^ David D. Gillette (ed.). "[paleontology in Utah]". 99. {{cite journal}}: Cite journal requires |journal= (help); External link in |title= (help)
  3. ^ James H. Madsen. Allosaurus fragilis: a revised osteology.

References[edit]

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