Preprismatoolithus

Preprismatoolithus Temporal range: Late Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Egg fossil classification
Basic shell type:	†Dinosauroid-prismatic
Oofamily:	†Prismatoolithidae
Oogenus:	†Preprismatoolithus Zelenitsky & Hills, 1996

Preprismatoolithus is a Late Jurassic oogenus. The species P. coloradensis is described by John Foster as being "of the prismatic basic type,"^[1] with subspherical eggs about 10 cm (4 inches) in diameter.^[2] This oospecies was first attributed to "hypsilophodontid" dinosaurs, although an initial lack of associated embryo material made confirming the egg-layer's identity impossible.^[1] After a finding in Portugal^[3] associated prismatic basic types with embryos, it now is known to be theropod.

Eggshell present in great abundance at the so-called "Young Egg Locality" which seems to have been a dinosaur nesting ground.^[1] Congeneric eggshell fossils are found at additional Colorado sites including the Fruita Paleontological Area, the Uravan Locality and Garden Park.^[1]

• Dinosaurs of the Morrison Formation

• Foster, J. (2007). Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. 389pp. ISBN 978-0-253-34870-8.

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