Thescelosaurus

Thescelosaurus

Thescelosaurus or "marvelous lizard" was a mid-size dinosaur from the late Cretaceous that roamed the northwest US. They were bipedal and reached a length of 13 feet. Fossil remains include well preserved teeth, bones, and claws, and are highly valued by collectors. These top quality specimens were all legally collected from private lands in the northwestern US. Late Cretaceous, Hell Creek Fm. (or equivalent), 68-66 MYA.

Thescelosaurus fossils are less abundant than the large theropods and herbiovores in the Hell Creek Fm. A dinosaur census conducted by the Hell Creek Project calculated relative abundance of the Thescelosaurus was 8% of the population. Today, we find fossilized teeth, unguals (claws), spikes, and non-associated bones. Authenticity guaranteed.

Thescelosaurus 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. Link to the Fossil Forum discussion. 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.

Thescelosaurus 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 rare and are highly collectable.


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  1. Thescelosaurus
    $495.00

    A rare, Top Quality Thescelosaurus neglectus lower jaw section from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. One crack was stabilized.No restoration. An exceptional Thescelosaurus jaw section! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Thescelosaurus jaw section. Note - jaw section comes with a Riker frame. Authenticity guaranteed. 

    DI16       SIZE: 2-3/16"    

    Note - Adding 16 new Thescelosarus fossils in March 2021.       Link to Thescelosaurus fossils catalog

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  2. Thescelosaurus
    $495.00

    A Top Quality Thescelosaurus neglectus pes ungual (foot claw) from the late Cretaceous of northern North America. A March Fossil of the Month. Thescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This claw is excellent quality with excellent color / patina. Exceptional preservation. Perfect tip and proximal proximal end. Note - Thesc unguals are described as flat triangles.(see Thesc-Pachy claw differentiation discussion below). No repair and no restoration. A rare Thescelosaurus pes ungual! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus claw. Note - claw comes with a Riker type frame. Authenticity guaranteed.

    DI23        SIZE: 1-11/16"  

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  3. Thescelosaurus
    $495.00

    A Top Quality Thescelosaurus neglectus caudal (tail) vertebra from the late Cretaceous of northern North America. A March Fossil of the Month. Thescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone quality is excellent with excellent color and patina. Highest quality bone preservation. The fragile vertebra processes are nearly complete - very rare! No repair or restoration. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An incredible collector's quality Thescelosaurus vertebra. Authenticity guaranteed. Museum Quality. A very rare piece.

    DI42       SIZE: 2-1/4"  x  1-3/4" x 2-3/4" height

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  4. Thescelosaurus
    $475.00

    An EXTRA LARGE, Top Quality Thescelosaurus neglectus caudal (tail) vertebra chevron from the late Cretaceous of northern North America. A March Fossil of the Month. Thescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The chevron is the appendage that resides below the tail vertebra that provides structure to the base of the tail. Chevron bones rarely survive and this one is 99% complete - very rare! This bone quality is excellent with excellent color and patina. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Thescelosaurus vertebra chevron. Authenticity guaranteed. Museum Quality. A rare find!

    DI52       SIZE: 6-3/4"  

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  5. Thescelosaurus
    $450.00

    A very rare, Top Quality Thescelosaurus neglectus metatarsal (I) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This is the metatarsal for toe #1. This bone has excellent quality with excellent color / patina. Minor crack fill. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. Excellent collector's quality Thescelosaurus toe bones. Authenticity guaranteed.

    DI26       SIZE: 4-5/8"  x  2-5/16"  x  1-3/8" wide

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  6. Thescelosaurus
    $425.00

    A rare, Top Quality Thescelosaurus neglectus metatarsal (II) from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This is the metatarsal for toe #2. This bone has excellent quality with excellent color / patina. Minor crack fill. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Garfield Co., Montana. Excellent collector's quality Thescelosaurus toe bones. Authenticity guaranteed.

    DI27       SIZE: 5"  x  1-1/2" wide

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  7. Thescelosaurus
    $375.00

    A Top Quality Thescelosaurus neglectus caudal (tail) vertebra from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone quality is excellent with excellent color and patina. Very high bone preservation. This vertebra includes a large section of the processes. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Thescelosaurus vertebra. Authenticity guaranteed. Museum Quality.

    DI43       SIZE: 2-1/2"  x  1-3/4" x 2-1/4" height

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  8. Thescelosaurus
    $325.00

    A rare, Top Quality Thescelosaurus neglectus rooted maxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thesc maxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An exceptional Thescelosaurus rooted tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed. 

    DI02       SIZE: 9/16"    

    Note - Adding 16 new Thescelosarus fossils in March 2021.       Link to Thescelosaurus fossils catalog

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  9. Thescelosaurus
    $295.00

    A rare, Top Quality Thescelosaurus neglectus rooted maxillary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. The enamel is excellent quality with excellent color / patina. Note - Thesc maxillary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. An exceptional Thescelosaurus rooted tooth! Legally collected on private land in the Hell Creek Fm., Powder River Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed. 

    DI03       SIZE: 9/16"    

    Note - Adding 16 new Thescelosarus fossils in March 2021.       Link to Thescelosaurus fossils catalog

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  10. Thescelosaurus
    $295.00

    An EXTRA LARGE, Top Quality Thescelosaurus neglectus caudal (tail) vertebra from the late Cretaceous of northern North America. Thescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone quality is excellent with excellent color and patina. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality large Thescelosaurus vertebra. Authenticity guaranteed. 

    DI41       SIZE: 2-3/8"  x  2-1/16" x 2-5/8" height

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

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  11. Thescelosaurus
    $295.00

    A rare, Top Quality Quality Thescelosaurus neglectus rooted dentary tooth from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. An exceptional juvenile Thescelosaurus rooted tooth! The enamel is excellent quality with excellent color / patina. Note - Thescelosaurus maxillary and dentary teeth crown shape is quite distinct (see Thesc-Pachy maxillary teeth differentiation discussion below). No cracks or restoration. Legally collected on private land in the Hell Creek Fm., Carter Co., Montana. An excellent collector's quality Thescelosaurus tooth. Note - tooth comes with the gem case pictured. Authenticity guaranteed. Perfect dentary tooth.

    DI01        SIZE: 3/8"    

    Note - Adding 10 new Thescelosarus teeth in July 2022.   Link to Thescelosaurus fossils catalog

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  12. Thescelosaurus
    $275.00

    An EXTRA LARGE, Top Quality Thescelosaurus neglectus toe bone from the late Cretaceous of northern North AmericaThescelosaurus is a mid-sized dinosaur found in the Hell Creek formation. This bone has excellent quality with excellent color / patina. No repair or restoration. Legally collected on private land in the Hell Creek Fm., Garfield Co., Montana. Excellent collector's quality Thescelosaurus toe bones. Authenticity guaranteed.

    DI31       SIZE: 1-5/8"  x  1-3/4" wide

    Note - Adding 23 new Thescelosarus fossils in March 2022.   Link to Thesc fossils catalog

    Learn More

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