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.
- Stegoceras validum - Skull Dome$4,250.00
An ultra rare Top Quality Stegoceras validum dome (frontoparietal skull bone) from the late Cretaceous of northern North America. An April Fossil of the Month. Stegoceras is a smaller sized pachycephalosaurid dinosaur, and like Pachycephalosaurus, it is a dinosaur which is famous for its large domed head surrounded by spikes. This is excellent quality juvenile dome with good color / patina. No cracks or restoration. There is a small sheer on the left side that occured prior to fossilization since it has the natural patina. Otherwise a complete dome. An ultra rare Stegoceras dome! Legally collected on private land in the Judith River Fm., Hill Co., Montana. An excellent collector's quality Stegoceras dome. Comes with a Riker display case. Authenticity guaranteed. You don't see Stegoceras domes very often. This is a very special, prefect little dome! (Photo series = top, bottom, right side, left side, and rear).
DP50 SIZE: 2-5/8" x 2" (1-1/2" thick)
Note - Adding 13 new Pachy spikes, claws and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus spike$1,750.00
A Top Quality, Rare Pachychephalosaurus wyomingensis spike from the late Cretaceous of northern North America. An April Fossil of the Month. A complete spike with excellent articulation. 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 Pachy skull. This spike has exceptional color / patina. The blood grooves are still present in the bone. It is a complete specimen with no cracks or breaks. Note - the excellent articulated skull surface on the base of the spike. 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. My BEST Pachy spike remaining from the "Rancher's collection"!
DP31 SIZE: 1-5/8" Height (Base: 2" x 1-3/8")
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus cluster$1,425.00
A Top Quality, Ultra Rare Pachychephalosaurus wyomingensis node cluster from the late Cretaceous of northern North America. 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 is a node cluster with a large node surrounded by a group of smaller nodes. This node cluster has excellent color / patina with exceptional surface articulation. The blood grooves are still present in the bone. 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 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.
DP33 SIZE: 1" H (Base: 1-1/2" x 1-1/8")
Note - Adding 10 new Pachy spikes / nodes in June 2021. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus spike$1,125.00
A Top Quality, Rare Pachychephalosaurus wyomingensis spike from the late Cretaceous of northern North America. A complete node with good articulation. 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 Pachy 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.
DP32 SIZE: 1-3/8" Height (Base: 1-1/8" x 15/16")
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus cluster$995.00
A Top Quality, Ultra Rare Pachychephalosaurus wyomingensis node cluster from the late Cretaceous of northern North America. 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 is a node cluster with five nodes (three complete and two partial nodes). This node cluster has excellent color / patina with exceptional surface articulation. The blood grooves are still present in the bone. 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 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 unique specimen.
DP35 SIZE: 7/8" x 13/16"
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus$950.00
A LARGE, Top Quality Pachychephalosaurus wyomingensis pes ungual (foot claw) from the late Cretaceous of northern North America. An April Fossil of the Month. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. This ungual has exceptional color and patina. 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., Carter 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: 1-15/16"
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus spike$950.00
A Top Quality, Rare Pachychephalosaurus wyomingensis spike from the late Cretaceous of northern North America. A complete node with good articulation. 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 Pachy 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 node. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed.
DP34 SIZE: 1-3/16" Height (Base: 1-1/8" x 7/8")
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus spike$950.00
A Top Quality, Rare Pachychephalosaurus wyomingensis spike from the late Cretaceous of northern North America. A complete node with good articulation. 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 Pachy 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 node. You don't see these skull pieces very often. No repair or restoration. Authenticity guaranteed.
DP38 SIZE: 1-3/16" (1-1/8" W)
Note - Adding 10 new Pachy spikes / nodes in June 2021. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus$775.00
A Top Quality Pachychephalosaurus wyomingensis pes ungual (foot claw) from the late Cretaceous of northern North America. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. This ungual has excellent color and patina. Complete and well preserved with slight tip wear. Overall an excellent 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. No repair or restoration. An exceptional collector's quality Pachychephalosaurus claw. Museum quality. Note - claw comes with a Riker type frame. Authenticity guaranteed.
DP22 SIZE: 1-1/2"
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus$695.00
An EXTRA LARGE Ultra Rare, Top Quality Pachychephalosaurus wyomingensis premaxillary tooth from the late Cretaceous of northern North America. An April Fossil of the month. This tooth is often referred to as the Pachy "Fang". There are posterior serrations present on this tooth. There is also a wear facet on the tooth (quite common). Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with great color and patina. No cracks or restoration. An ultra rare Pachy premax tooth! Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Pachychephalosaurus premaxillary tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed. a fantastic. My largest Pachy premaxillary tooth!
DP01 SIZE: 1/2"
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus spike$695.00
A Top Quality, Rare Pachychephalosaurus wyomingensis head spike from the late Cretaceous of northern North America. 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 Pachy skull. This juvenile Pachy skull spike has excellent color and patina. Note the large blood grooves in the bone. It is a complete skull spike specimen. Note - the very tip was professionally restored. 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. Authenticity guaranteed.
DP36 SIZE: 7/8" (1/2" wide)
Note - Adding 13 new Pachy spikes, claws, and teeth in April 2023. Link to Pachy fossils catalog
Learn More - Pachycephalosaurus$595.00
A Top Quality Pachychephalosaurus wyomingensis rooted tooth from the late Cretaceous of northern North America. Pachychephalosaurus is the dinosaur which is famous for its large domed head surrounded by spikes. The enamel is excellent quality with great color / patina. Typical wear faucet from grinding on opposing teeth. Note - high center ridge and crown assymetry (see Pachy maxillary teeth differentiation discussion below). Note the nice crown wave on the left side. No cracks or restoration. An ultra rare Pachy tooth! Legally collected on private land in the Hell Creek Fm., Carter 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: 7/16"
Note - Adding 13 new Pachy spikes, claws and teeth in April 2023. Link to Pachy fossils catalog
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