5" Pachycephalosaurus Dome Spikes - Very Rare Find!

This is a very cool, piece collected recently in South Dakota. It is a pair of well preserved dome spikes from Pachycephhlosaurus. Pachycephhlosaurus had a very thick dome atop their skull which was fringed with spikes.

There are two spikes present the larger one measure 2 3/4" long and the smaller 2 1/2" long. The only restoration is some very thin gap fills in the repaired cracks. This is a phenomenal piece, and something like this doesn't come onto the market vey often.

An artists reconstruction of the head of Pachycephalosaurus.  By Ryan Steiskal
An artists reconstruction of the head of Pachycephalosaurus. By Ryan Steiskal


  • Pachycephalosaurus was a bipedal dinosaur that lived during the Late Cretaceous period and probably was about 15 feet in length.

  • Pachycephalosaurus had a distinctive, large, bony, dome on top of it's skull up to 10 inches thick to cushion it's brain from impacts.

  • Some paleontologists believe this thick skull may have been used for head-butting, much like rams while others contend it may have been a sexual display.

  • It was one of the last non-avian dinosaurs before the K-T extinction event, 65 million years ago.

  • There is only one known species of Pachycephalosaurus, Pachycephalosaurus wyomingensis. It's remains have been found in Montana, South Dakota and Wyoming.

  • It was either a herbivore or an omnivore with small leaf shaped teeth which would have been very effective at shredding plants.


  • An artists reconstruction of Pachycephalosaurus.  By Jordan Mallon
    An artists reconstruction of Pachycephalosaurus. By Jordan Mallon
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    DETAILS
    SPECIES
    Pachycephalosaurus
    LOCATION
    Newell, South Dakota
    FORMATION
    Hell Creek Formation
    SIZE
    5 x 5", larger spike 2 3/4" long
    CATEGORY
    SUB CATEGORY
    ITEM
    #84451
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