A photo of 8 Pterocephalia trilobite fossils of various sizes illustrating their size range. The top left piece in the photo contains a tiny Pterocephalia measuring 7mm in length along with two even tinier Labiostria westropi trilobites. The large piece at the lower right in the photo is a pygidium (tail) from what would have been a very large specimen. The pygidium measures 75mm across.

Closeup photo of the top left piece in the first photo. The largest trilobite (Pterocephalia indet. species) measures 7mm in length.

A selection of Upper #Cambrian Pterocephalia #trilobite fossils from the #McKayGroup of Southeastern BC, Canada. Note the size range of the specimens. The top left specimen is 7mm long. The lower right specimen (a pygidium) is 75mm across.

#PaleoSky #TrilobiteTuesday #FossilFriday #Palaeontology

Agnostotes orientalis (length = 13mm). Note the shape of the deuterolobe (axial lobe of the pygidium). The margins of that lobe are angular.

Agnostotes weugi (length = 11.5mm). Note the rounded margins of the pygidial deuterolobe (=axil lobe of the pygidium).

Agnostotes orientalis & Agnostotes weugi are similar looking agnostids from the Upper #Cambrian (Furongian) #McKayGroup of Southeastern British Columbia. It’s thought that A. weugi may have originated from the slightly older A. orientalis.
#PaleoSky #TrilobiteTuesday #Palaeontology #Paleontology

An unexpected & exciting surprise!

This Anechocephalus rebeccaae #trilobite was hidden away with many similar looking Labiostria westropi that I collected 15-20 years ago in the Upper Cambrian #McKayGroup of SE British Columbia. Rarest bug in my collection!
#PaleoSky #FossilFriday #TrilobiteTuesday

Proceratopyge canadensis

Proceratopyge rectispinata

Note the diffences between the axial lobes, glabella shape and glabellar furrows. Proceratopyge canadensis (left) and Proceratopyge rectispinata (right)

Proceratopyge canadensis and Proceratopyge rectispinata are similar species of #trilobites from the Upper #Cambrian #McKayGroup of S.E. British Columbia. Both occur in the Wujiajiania lyndasmithae Subzone of the Elvinia Zone.
#TrilobiteTuesday #FossilFriday #Palaeontology #Paleontology #PaleoSky

It’s #trilobitetuesday again so here’s another Upper #Cambrian #trilobite from Southeastern British Columbia’s #McKayGroup. This one is Orygmaspis doriansmithi. Length = 6mm.
#FossilFriday #PaleoSky #Palaeontology #Paleontology #fossil #fossils #FossilCollecting #InvertebrateFossil

Orygmaspis mckelleri

Orygmaspis mckelleri

Orygmaspis spinula

Figure plate of Orygmaspis mckelleri (A) and Orygmaspis spinula from a comprehensive monograph on McKay Group trilobites. The diagrams show the differences between these very similar trilobites. Chatterton, Brian D.E., and Stacey Gibb, 2016. Furongian (Upper Cambrian) trilobites from the McKay Group, Bull River Valley, southeastern BC, Canada. Palaeontographica Canadiana No. 35

Two Upper #Cambrian #trilobites of the genus Orygmaspis from the #McKayGroup of Southeastern British Columbia, Canada. See the figures for details on the differences and species names (Alt text).
#trilobitetuesday #FossilFriday #PaleoSky #Palaeontology #Paleontology

Orygmaspis contracta is one of 8 species of the genus Orygmaspis currently known from the Upper #Cambrian #McKayGroup of Southeastern British Columbia, Canada.
#TrilobiteTuesday #Trilobite #PaleoSky #Palaeontology #Paleontology #Fossil #FossilCollecting

Two specimens of the #trilobite Olenaspella chrisnewi from the Upper #Cambrian McKay Group of the southern Canadian Rockies.

Named in honour of Cranbrook resident and trilobite collector Chris New.

#TrilobiteTuesday #PaleoSky #Palaeontology #Paleontology #FossilFriday #FossilCollecting #McKayGroup

They might not look like much, but these Burnetiella leechi are amongst the rarer #LateCambrian #trilobites found in the #McKayGroup of southeastern British Columbia. In 30 years of collecting, I’ve only ever found these 2!
#PaleoSky #Palaeontology #Paleontology #FossilFriday #TrilobiteTuesday

Cernuolimbus ludvigseni

Local collectors call them "snow ploughs" after the upturned anterior margin that is plough-like. They are found in the lowest trilobite bearing levels of the #McKayGroup, Southeastern BC, Bull River Valley area.

#TrilobiteTuesday #PaleoSky #Palaeontology #Paleontology