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Preprismatoolithus
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<p><i>Preprismatoolithus</i> is a <a href="/facts/Late_Jurassic/NzU9rlnL">Late Jurassic</a> <a href="/facts/Egg_fossil/nH5XHNRS">oogenus</a>. The species <i>P. coloradensis</i> is described by John Foster as being "of the prismatic basic type," with subspherical eggs about 10 cm (4 inches) in diameter. This oospecies was first attributed to "<a href="/facts/Hypsilophodont/fJCCNJY6">hypsilophodontid</a>" dinosaurs, although an initial lack of associated embryo material made confirming the egg-layer's identity impossible. After a finding in Portugal associated prismatic basic types with embryos, it now is known to be theropod. </p><p>Eggshell present in great abundance at the so-called "Young Egg Locality" which seems to have been a dinosaur nesting ground. Congeneric eggshell fossils are found at additional Colorado sites including the Fruita Paleontological Area, the Uravan Locality and Garden Park. </p>