Pachycephalosaurus

Pachycephalosaurus

Pachycephalosaurs were the "dome-headed" dinosaurs which had a thick, fused skull which had short bony spikes or nodes along the dome fringe. They may have used these thick skulls for head butting. The Pachycephalosaurus was a medium sized dinosaur which reached a length of 15 feet. They roamed the northwestern US during the late Cretaceous period. Fossil remains in well preserved teeth, bones and claws. Late Cretaceous, Hell Creek Fm. (or equivalent), 68-66 MYA.

Pachycephalosaurus fossils are quite rare. In fact, only one partial skeleton has been found. A dinosaur census conducted by the Hell Creek Project calculated relative abundance of the Pachycephalosaurus was 1% of the population. Today, we find fossilized teeth, unguals (claws), spikes, and non-associated bones. Authenticity guaranteed.

Pachycephalosaurus tooth identification. Thescelosaurus teeth are routinely identified and sold as Pachycephalosaurus teeth since they maxillary teeth have similar shape and size. There has been some good work done presented in the Fossil Forum. The Fossil Forum author concludes that Pachycephalosaurus maxillary teeth can be differentiated from Thescelosaurus teeth since the Pachy teeth exhibit  “vertical ridges are more pounced, fewer and a more prominent center ridge may exist. There is also no symmetry with the crowns.” Several good photographic references are provided. A dominant center ridge appears to be consistent and lack of symmetry on the crown appeared in most of the Pachycepholsaur reference teeth.  That said, rooted teeth from both species are scarce and are highly collectable.

Pachycephalosaurus ungual (claw) identification. Thescelosaurus unguals (claws) are routinely identified and sold as Pachycephalosaurus unguals as they have a similar shape and size. Unfortunately there is little reference data for Pachycephalosaurus unguals with only one Pachy specimen with partial legs found. Per my discussion with the primary Fossil Forum Hell Creek dinosaurs author, he suggested “to differentiate between the two is Thescelosaurus claws are flat and triangular and the ones with a twist are Pachy”. That said, unguals  (claws) from both species are scarce and are highly collectable.

Pachycephalosaurus spikes or nodes. Pachycephalosaurus dinosaurs are known for their large domed skull tops which is an extremely thick bone and a skull that was ornamented with “spikes” and “nodes” giving them a one-of-a-kind appearance. The Pachy spikes and nodes are not attached to the skull, but are actual skull elements that typically found as segments of skull with nicely articulated surfaces on top and bottom. So, these skull pieces would come from a Pachycephalosaurus that passed away. The largest spikes or horns are found on the back of the neck of the early Pachycephalosaurus growth stages referred to  Dracorex and Stygimoloch. The Pachy spikes and nodes are quite rare and highly collectable.


View as Grid List

Items 13-24 of 25

Page
Set Ascending Direction
per page
  1. Pachycephalosaurus
    $450.00

    A Top Quality Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. Typical wear faucet from grinding on opposing teeth. Note - strong high center ridge and some assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP07       SIZE: 9/16"    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  2. Pachycephalosaurus
    $450.00

    A Top Quality Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. Typical wear faucet from grinding on opposing teeth. Note - high center ridge and assymetry (see Pachy maxillary teeth differentiation discussion below) and a nice crown wave on the right side. No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. My best rooted maxillary Pachy tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP03       SIZE: 9/16"   

    Note - Adding 10 new Pachy spike and teeth in June 2021.       Link to Pachy fossils catalog

    Learn More
  3. Pachycephalosaurus spike
    $325.00

    A Top Quality, Rare Pachychephalosaurus wyomingensis spike from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by these spikes and nodes. These spikes and nodes were part of the skull. This spike has excellent color / patina. It is a complete specimen with no cracks or breaks. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Pachychephalosaurus spike. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed.

    DP40       SIZE: 13/16"   (3/4" W) 

    Note - Adding 10 new Pachy spikes / teeth in June 2021.       Link to Pachy fossils catalog

    Learn More
  4. Pachycephalosaurus spike
    $295.00

    A Top Quality, Rare Pachychephalosaurus wyomingensis spike from the late Cretaceous of northern North America. Excellent articulation. Note - The top of this spike broke away prior to deposition. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by these spikes and nodes. These spikes and nodes were part of the skull. This spike has excellent color / patina. It is a complete specimen with no cracks or breaks. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus spike. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed.

    DP39       SIZE: 1-7/16"   (3/4" W) 

    Note - Adding 10 new Pachy spikes / nodes in June 2021.       Link to Pachy fossils catalog

    Learn More
  5. Pachycephalosaurus
    $0.00

    A Top Quality Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. Typical wear faucet from grinding on opposing teeth. Note - high center ridge and assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. My best rooted maxillary Pachy tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP03 BoP      SIZE: 3/4"+    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  6. Pachycephalosaurus
    $0.00

    A Top Quality Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. No wear faucet from grinding on opposing teeth. Note - strong high center ridge - one side and assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP04        SIZE: 11/16"    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  7. Pachycephalosaurus
    $0.00

    A Top Quality Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. No wear faucet from grinding on opposing teeth. Note - strong high center ridge and assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP05       SIZE: 5/8"+    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  8. Pachycephalosaurus
    $0.00

    A Top Quality Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. Typical wear faucet from grinding on opposing teeth. Note - less pronounced high center ridge and some assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP06       SIZE: 1/2"+    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  9. Pachycephalosaurus
    $0.00

    A GEM Pachychephalosaurus wyomingensis maxillary tooth from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with excellent color / patina. Typical wear faucet from grinding on opposing teeth. Note - strong high center ridge and assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP08       SIZE: 7/16"    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  10. Pachycephalosaurus
    $0.00

    A high quality Pachychephalosaurus wyomingensis maxillary crown from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is high quality with excellent color / patina. Typical wear faucet from grinding on opposing teeth. Note - strong high center ridge and assymetry (see Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An ultra rare Pachy maxillary tooth! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Pachychephalosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP09       SIZE: 5/16"    

    Note - Adding 13 new Pachy fossils in July 2018.       Link to Pachy fossils catalog

    Learn More
  11. Pachycephalosaurus
    $0.00

    An EXTRA LARGE, Top Quality Pachychephalosaurus wyomingensis pes ungual (foot claw) from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. This ungual has excellent color and patina. There is one barely visible stress fracture which is stabilzed. Small portion of the end of each "wing" (rear of the base of the blood groove) has some damage. Overall an excellect pes ungual. Note - this ungual has the Pachy twist (see Pachy ungual differentiation discussion below)No repair or restoration. An ultra rare Pachy pes ungual! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An exceptional collector's quality Pachychephalosaurus ungual. Museum quality. My largest Pachy claw. Note - claw comes with a Riker type frame. Authenticity guaranteed. Authenticity guaranteed.

    DP21       SIZE: 2-3/8"   (1-1/4" W) 

    Note - Adding 4 new Pachy unguals in July 2018.       Link to Pachy fossils catalog

    Learn More
  12. Pachycephalosaurus
    $0.00

    A GEM  Pachychephalosaurus wyomingensis pes ungual (foot claw) from the late Cretaceous of northern North AmericaPachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. This ungual has excellent color and patina. Complete specimen. An exceptional pes ungual. Note - this ungual has a strong Pachy twist (see Pachy ungual differentiation discussion below)No repair or restoration. An ultra rare Pachy pes ungual! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An exceptional collector's quality Pachychephalosaurus claw. Museum quality. Note - claw comes with a Riker type frame. Authenticity guaranteed. You do not see these top quality claws any more...

    DP23       SIZE: 1-5/8"   

    Note - Adding 4 new Pachy unguals in July 2018.       Link to Pachy fossils catalog

    Learn More

View as Grid List

Items 13-24 of 25

Page
Set Ascending Direction
per page