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), 67-66 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.

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.

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  1. Pachycephalosaurus spike
    $1,450.00

    A Top Quality, Rare Pachychephalosaurus wyomingensis node cluster from the late Cretaceous of northern North America. Another March 2019 Fossil for the Month Offering. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by these spikes and nodes. This spike has excellent color / patina with exceptional surface articulation. It is a complete specimen with no cracks or breaks. This is a node cluster with a large node surrounded by a group of small nodes. Note -  the excellent articulated skull surface on the base of the node. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent and very rare collector's quality Pachychephalosaurus node cluster. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed. A very special piece!

    DP34       SIZE: 1-5/8" H  x  1-5/8" W

    Note - Adding 5 new Pachy spikes / nodes in March 2019.       Link to Pachy fossils catalog

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  2. Pachycephalosaurus spike
    $1,275.00

    A Top Quality, Rare Pachychephalosaurus wyomingensis node from the late Cretaceous of northern North America. Another March 2019 Fossil for the Month Offering. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by these spikes and nodes. This spike has excellent color / patina with exceptional surface articulation. It is a complete specimen with no cracks. Note -  the excellent articulated skull surface on the base of the node. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent and rare collector's quality Pachychephalosaurus node. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed. A special piece!

    DP33       SIZE: 1-5/8" H  x  1-1/2" W

    Note - Adding 5 new Pachy spikes / nodes in March 2019.       Link to Pachy fossils catalog

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  3. Pachycephalosaurus spike
    $1,125.00

    A Top Quality, Rare Pachychephalosaurus wyomingensis node cluster 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. This spike has excellent color / patina. It is a complete specimen with no cracks or breaks. Note -  the excellent articulated skull surface on the base of the node. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus node. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed. 

    DP35       SIZE: 2-1/8" H  ;  Base  1-1/2" x  1-1/2"

    Note - Adding 5 new Pachy spikes / nodes in March 2019.       Link to Pachy fossils catalog

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  4. Pachycephalosaurus spike
    $975.00

    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. 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.

    DP31       SIZE: 1-15/16"   (1" W) 

    Note - Adding 5 new Pachy spikes / nodes in March 2019.       Link to Pachy fossils catalog

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  5. Pachycephalosaurus spike
    $875.00

    A Top Quality, Rare Pachychephalosaurus wyomingensis node 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. This spike has excellent color / patina. It is a complete specimen with no cracks. Note -  the articulated skull surface on the base of the node. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus node. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed.

    DP32       SIZE: 1-3/8" H  x  1-9/16" W

    Note - Adding 5 new Pachy spikes / nodes in March 2019.       Link to Pachy fossils catalog

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  6. Pachycephalosaurus
    $795.00

    A 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 / 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 restoration. An ultra rare Pachy pes ungual! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Pachychephalosaurus ungual. 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

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  7. Pachycephalosaurus
    $695.00

    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 / 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 excellent collector's quality Pachychephalosaurus claw. Note - claw comes with a Riker type frame. Authenticity guaranteed.

    DP23       SIZE: 1-5/8"   

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

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  8. Pachycephalosaurus
    $695.00

    A 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 / patina. Complete and well preserved with slight tip wear. Overall an exceptional 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 excellent collector's quality Pachychephalosaurus claw. Note - claw comes with a Riker type frame. Authenticity guaranteed.

    DP22       SIZE: 1-7/8"   

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

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  9. Pachycephalosaurus
    $575.00

    A 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 / patina. Complete specimen with a small amount of tip wear. 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 excellent collector's quality Pachychephalosaurus claw. Note - claw comes with a Riker type frame. Authenticity guaranteed.

    DP24       SIZE: 1-7/16"   

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

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  10. Pachycephalosaurus
    $425.00

    A Top Quality Pachychephalosaurus wyomingensis incisor tooth from the late Cretaceous of northern North AmericaA July 2018 Fossil for the Month. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is very good quality with excellent color / patina. A little root etching on one side. Excellent serrations. No cracks or restoration. An ultra rare Pachy incisor tooth! Legally collected on private land in the Hell Creek Fm., Garfield Co., Montana.An excellent collector's quality Pachychephalosaurus tooth. My best Pachy incisor. Note - tooth comes with the gem case pictured. Authenticity guaranteed.

    DP01       SIZE: 1/2"+    

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

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  11. Pachycephalosaurus
    $375.00

    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

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  12. Pachycephalosaurus
    $375.00

    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       SIZE: 3/4"+    

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

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  13. Pachycephalosaurus
    $350.00

    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

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  14. Pachycephalosaurus
    $350.00

    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

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  15. Pachycephalosaurus
    $350.00

    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

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  16. Pachycephalosaurus
    $350.00

    A Top Quality Pachychephalosaurus wyomingensis incisor 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 very good quality with excellent color / patina. Serrations are worn. No cracks or restoration. An ultra rare Pachy incisor 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.

    DP02       SIZE: 9/16"    

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

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  17. Pachycephalosaurus
    $225.00

    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

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  18. Pachycephalosaurus
    $125.00

    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

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