fond_Lagerstatten

McKay Group - Upper Cambrian
(Steptoean) 494.5-493 Ma
Carlo Kier Collection

Paleo_McKay

In these pages are illustraded the trilobites collected or acquired from the McKay Group near Cranbrook in southeastern British Columbia, Canada, by my friend Carlo Kier.

A single locality from the lower McKay Group on a small tributary of Tanglefoot Creek in the Kootenay Ranges, about 22.5 km east north east of Fort Steele in southeastern British Columbia has yielded an astonishingly abundant and rich Upper Cambrian trilobite fauna of latest Steptoean age (click on satellite image to download the GooglerEarth .kmz file of the locality).
More than 3,600 specimens of largely complete trilobites record the presence of more than a dozen species. The trilobites of the Tanglefoot Creek locality, like those at the older Cambrian locality in the House Range, are preserved in nodules composed of vertical encrustations of calcite crystals. The locality is only tens of kilometres east of the Rocky Mountain Trench, a physiographic feature associated with a complex of faults that extends almost 1,500 km along the mountains, and was situated close to the margin of Laurentia during the Paleozoic.

McKay location

The McKay Group (Evans, 1933) is a thick sequence of shales, limestones, and dolostones nearly 3,000 m thick exposed east of the Rocky Mountain Trench in a belt that extends from the Fernie area in the south to Yoho National Park in the north.
[Text extracted from: Brian D. E. Chatterton, Rolf Ludvigsen - Upper Steptoean (Upper Cambrian) Trilobites from the McKay Group of Southeastern British Columbia, Canada. Memoir (The Paleontological Society), Vol. 49, Supplement to Vol. 72, no. 2 of the Journal of Paleontology (Mar., 1998), pp. 1-43]

HIDDEN Vacanze_in_BC_Agosto_2007_274

The fossils are organized by Order of appartenance. Click on the order distribution poster to show it at full resolution or click to this address to access to the poster with the nine orders of trilobites (I’m working for the version 2). Many these marvellous trilobites are wonderfully prepped by Dave Comfort.
I’m grateful also to Chris Jenkins for his help and availability to send me additional pictures of new findings from McKay sites.

Some specimens illustrated aren’t property of Carlo, in this case the Copyrigth is noted on the bottom of the photo. The list it is not clearly exaustive and will be upgraded periodically.

Internet sources  of information are:
http://www.westernta.com/Formations/McKay.htm
http://www.fossilmall.com
http://findarticles.com/p/articles/mi_qa3790/is_199803/ai_n8801737
http://www.fossilmuseum.net/Fossil_Galleries/canadian-trilobites.htm
http://www.westernta.com/Formations/McKay.htm
http://links.jstor.org/sici?sici=0078-8597(199803)49%3C1%3AUS(CTF%3E2.0.CO%3B2-O
http://geol.queensu.ca/people/price/pdf/GdBkGAC2003FldTrpClgry_Vncvr.0.pdf
http://www.tyra-rex.com/trilobite/CamB/tc2.html

McKay Trilobites from the Carlo Kier collection II   >


Click on name to access directly to the trilobite:

Agnostid sp.

Mesonacis sp.

Cernuolimbus cf pegakanthodes

Olenellus sp.

Cliffia cf. letaegenae

Orygmaspis contracta

Dicanthopyge sp.

Orygmaspis type2

Hedinaspis canadensis

Longhorn n.sp.

Helmet head

Orygmaspis type3

Housia sp.

Parabolinella n. sp.

Irvingella sp.

Pterocephalia norfordi

Labiostria n.sp.

Wanneria n.sp.

Labiostria westropi

Wujiajiania n.sp.


Order: AGNOSTIDA

Trilobites distribution pour my site_Agnostida_icone

Small trilobites (usually only a few mm long) with cephalon and pygidium strongly similar in outline and size (isopygous); enrollment typical.
Cephalic shield with deeply parabolic outline, maximum width usually anterior of genal angle, sutures proparian or lacking; border convex; glabella fusiform, widest at base (except in Condylopygidae), glabellar segmentation highly variable, sometimes complex, but in some species entirely effaced; most species eyeless; hypostome natant, specialized with ribbon-like wings; rostral plate lacking (or uncalcified).
Thorax composed by segments 2 (Agnostina) or 3 (some Eodiscina), axis typically broad, short fulcrate pleurae. Strongly isopygous; pygidial margin typically closely matching cephalic margin.
From: http://www.trilobites.info/ordagnostida.htm

Agnostid, site1,MCKay group,BC,late cambrian trlo BC nuovi 009

? Agnostotes sp.

Ord. : AGNOSTIDA
Fam : -
Gen.: -

From site 1


Order: ASAPHIDA

Trilobites distribution pour my site_Asaphida_icone

From: http://www.trilobites.info/ordasaphida.htm

Cernuolimbus cf Pegakanthodes site 7 Cernuolimbus cf Pegakanthodes_ site 7

Cernuolimbus cf Pegakanthodes PRATT, 1992

Ord.: ASAPHIDA
Fam.: PTEROCEPHALIIDAE
Gen.: Cernuolimbus, PALMER, 1960

From site 7


Dicanthophyge sp

Ord.: ASAPHIDA
Fam.: APHELASPIDIDAE
Gen.: Dicantophyge PALMER, 1965

Dicantophyge sp, McKay Group

Hedinaspis canadensis from Site 7

Hedinaspis canadensis

Ord.: ASAPHIDA
Fam.: CERATOPYGIDAE
Gen.: Hedinaspis Chatterton & Ludvigsen, 1998

From site 7

 


Housia sp,MCkay group_1
Housia sp,MCkay group_2

Housia sp

Ord.: ASAPHIDA
Fam.: PTEROCEPHALIIDAE
Gen.: Housia WALCOTT, 1916b


Labiostria new sp, site10 McKay group_2 Labiostria new sp, site 10 McKay group

Labiostria new sp. 

Ord.: ASAPHIDA
Fam.: APHELASPIDIDAE
Gen.: Labiostria PALMER, 1955

From site 10


Labiostria westropi, site1, McKay_5 Labiostria Westrap, Positive Part Labiostria Westropi, site1 McGroup_3
Labiostria Westropi, site1 McGroup_2 Labiostria Westropi, site1 McGroup_4

 

Labiostria Westropi, site1 McGroup

Labiostria westropi 

Ord.: ASAPHIDA
Fam.: APHELASPIDIDAE
Gen.: Labiostria PALMER, 1955

From site1


Orygmaspis_ContractaMcKay_group_2
Orygmaspis_Pigydium_1
Orygmaspis_Contracta_McKay_group
Orygmaspis_Pigydium_2

Orygmaspis contracta

Ord.: ASAPHIDA
Fam.: PARABOLINIDAE
Gen.: Orygmaspis RESSER, 1937b


Orygmaspis_type 2

Orygmaspis type 2

Ord.: ASAPHIDA
Fam.: PARABOLINIDAE
Gen.: Orygmaspis RESSER, 1937b

Orygmaspis type 2

Ord.: ASAPHIDA
Fam.: PARABOLINIDAE
Gen.: Orygmaspis RESSER, 1937b

From Site 1

Orygmaspis 2 Site 1

a_Orygmaspis a_Orygmaspis_type3

Orygmaspis type 3

Ord.: ASAPHIDA
Fam.: PARABOLINIDAE
Gen.: Orygmaspis RESSER, 1937b

This specie has long curved genal spines, 2 very long macropleural spines on thoraxand no pygidial border spines

 


2double

Orygmaspis n.sp 4.

Ord.: ASAPHIDA
Fam.: PARABOLINIDAE
Gen.: Orygmaspis RESSER, 1937b

From Site 1

8unknown

Orygmaspis n.sp. 5

Ord.: ASAPHIDA
Fam.: PARABOLINIDAE
Gen.: Orygmaspis RESSER, 1937b

From Site 1

With these two adds (December, 2007),  there are at least five Orygmaspis species from the area now. Thanks to Chris Jenkins for the communication.


Pterocephalia_Norfordi__site6_McKay_group_3 Pterocephalia_Norfordi__site6_McKay_group_4
Pterocephalia_norfordi_enrolled_site1_McKay_group
Pterocephalia_Norfordi__site6_McKay_group_2 Pterocephalia_norfordi_1

Pterocephalia norfordi CHATTERTON & LUDVIGSEN, 1989

Ord.: ASAPHIDA
Fam.: PTEROCEPHALIIDAE
Gen.: Pterocephalia ROEMER, 1849


Order: PTYCHOPARIIDA

Trilobites distribution pour my site_Ptychopariida_icone

Large, heterogenous order with primitive origins and problematic classification, with specialized offshoots that are hard to frame within a general diagnosis.

Cephalon typically with opisthoparian facial sutures, with gently forward-tapering simple glabella bearing a broad, rounded front, usually with 3 pairs of rather narrow parallel glabellar furrows; natant hypostome. Thorax typically large with 8+ thoracic segments. Pygidium quite variable, but typically with a small pygidium bearing a border (Cambrian) or a larger pygidium with or without border (post-Cambrian).
From: http://www.trilobites.info/ordptychopariida.htm

Irvingella n.sp

Irvingella n. sp. (left)

Ord.: PTYCHOPARIIDA
Fam.: ELVINIIDAE
Gen.: Irvingella ULRICH & RESSER in WALCOTT, 1924b

Irvingella sp. A ?
This specimens was found in the  Orygmaspis layers at Site 1 where there are no Irvingellas found,  probably is a young Orygmaspis type 3
-see above-[Chris Jenkins personal communication] 


Ord.: PTYCHOPARIIDA
Fam.: ELVINIIDAE
Gen.: Irvingella Chatterton & Ludvigsen, 1998

Irvingella

Wujiajiania from Site 7

Wujiajiania n.sp.

Ord.: PTYCHOPARIIDA
Fam.: OLENIDAE
Gen.: Wujiajiania LU& LIN, 1980

From site 7

Wujiajiania n.sp.

Ord.: PTYCHOPARIIDA
Fam.: OLENIDAE
Gen.: Wujiajiania LU& LIN, 1980

From site 1

Wujiajiania_Sutherlandi__site1_McKay_group_BC_1
Wujiajiania nsp, site 7 Mc kay group, BC

Wujiajiania n.sp.

Ord.: PTYCHOPARIIDA
Fam.: OLENIDAE
Gen.: Wujiajiania LU& LIN, 1980

From site 7


Parabolinella_nsp_McKay_group___Cranbrook___BC

Parabolinella n. sp.

Ord.: PTYCHOPARIIDA
Fam.: OLENIDAE
Gen.: Parabolinella BRÖGGER, 1882

Cliffia cf.  lataegenae Wilson 1949

Ord.: PTYCHOPARIIDA
Fam.: SOLENOPLEURIDAE
Gen.: Cliffia WILSON, 1951

From site 7

Extremely rare species.

Cliffia cf lataegenae Site 7

McKay Trilobites from the Carlo Kier collection II   >