Catoche Formation type section: Cassinian, Canada
collected by R. A. Fortey 1978

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Asaphida - Asaphidae
Isoteloides latimarginatus n. sp. Fortey 1979
synonym of Isoteloides canalis
Isoteloides peri n. sp. Fortey 1979
Trilobita - Proetida - Telephinidae
Opipeuter cf. angularis (Young 1973)
Carolinites genacinaca Ross 1951
subspecies nevadensis
Trilobita - Proetida - Bathyuridae
Strigigenalis caudata (Billings 1865)
Benthamaspis gibberula (Billings 1865)
Bathyurus gibberulus
Benthamaspis conica n. sp. Fortey 1979
Bathyurellus abruptus Billings 1865
Bathyurellus platypus n. sp. Fortey 1979
Uromystrum cf. affine (Poulsen 1937)
Bathyurellus affinis
Punka sp. Fortey 1979
Punka flabelliformis n. sp. Fortey 1979
Catochia glabra n. sp. Fortey 1979
Catochia ornata n. gen., n. sp. Fortey 1979
Bolbocephalus convexus (Billings 1865)
Petigurus nero (Billings 1865)
Bathyurina timon (Billings 1865)
recombined as Jeffersonia timon
Bathyurina sp. Poulsen 1937
    = Jeffersonia jenni Cullison 1944
Loch 2007
Jeffersonia angustimarginata Boyce 1989
Boyce 1989
synonym of Jeffersonia jenni
pygidium originally assigned to Bathyurina timon
Trilobita - Proetida - Dimeropygidae
Ischyrotoma anataphra n. sp. Fortey 1979
Trilobita - Phacopida - Pliomeridae
Strotactinus insularis (Billings 1865)
see common names

Country:Canada State/province:Newfoundland and Labrador
Coordinates: 50.7° North, 57.4° West (view map)
Paleocoordinates:30.6° South, 46.7° West
Basis of coordinate:estimated from map
Geographic resolution:local area
Period:Ordovician Epoch:Early/Lower Ordovician
10 m.y. bin:Ordovician 1-2
Key time interval:Cassinian Trilobite zone: Strigigenalis caudata
Age range of interval:482.00000 - 470.00000 m.y. ago
Geological group:St. George Formation:Catoche
Stratigraphic resolution:formation
Stratigraphy comments: Measured section is shown with dots indicating collection horizons but fossils occurrences are shown only as ranges rather than occurrences or only partially listed in plate captions.
Lithology and environment
Primary lithology:bioturbation,nodular,rubbly "limestone"
Secondary lithology: dolomite
Lithology description: "Thin bedded and rubbly surfaced limestone, with many styolite seams. Thin dolomite beds form recessive units less than half a meter thick at intervals through the section...Massive limestone increases toward the top of the section, and is progressively more dolomitized. Elsewhere dolomitization occurs preferentially along numerous bifurcating "worm" trails, producing a mottled appearance on fresh rock surfaces. Trilobites are most numerous in lenses of lime sand...The upper part of the Catoche Formation includes some apparently structureless mounds several meters in diameter."
Environment:open shallow subtidal
Geology comments: "It is generally accepted that the St. George Group as a whole is a relatively shallow water carbonate succession...Few stromatolitic beds are present in the Catoche Formation, but in the lower part there are frequent intraformational conglomerate beds, sometimes with clasts stacked edgewise, and occasional oolitic lenses...The concentration of the trilobites into lime sand lenses, and their complete disarticulation, often with breakage of the more delicate cephalic parts, indicates the activity of currents and/or tides was at least powerful enough to break, move, and 'winnow' trilobite skeletal parts...The appearance of the pelagic trilobites Carolinites and Opipeuter in the section is significant because it indicates free connection with the open oceans..."
Modes of preservation:body
Degree of concentration:concentrated
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:mechanical,field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:GSC
Collectors:R. A. Fortey Collection dates:1978
Collection method comments: Collected from fairly regular intervals in section but notes that trilobites were most easily recovered from lenses of lime sand which were most abundant in middle of section. Only Bolbocephalus and Petigurus (asaphids) were recovered from main body of limestone.
Taxonomic list comments:Macluritid gastropods and nautiloids common; gastropods also concentrated in more massive limestones that cap small bluffs along the shore. Receptaculites, Calathium and ?Bryozoa found in sections made from main body of limestone.
Database number:103540
Authorizer:M. Hopkins Enterer:M. Hopkins
Modifier:J. Alroy Research group:marine invertebrate
Created:2011-01-29 10:42:14 Last modified:2012-10-28 01:16:56
Access level:the public Released:2011-01-29 10:42:14
Creative Commons license:CC BY
Reference information

Primary reference:

34937. R. A. Fortey. 1979. Early Ordovician trilobites from the Catoche Formation (St. George Group), western Newfoundland. Geological Survey of Canada Bulletin 321:61-114 [M. Hopkins/M. Hopkins]

Secondary references:

35403 W. D. Boyce. 1989. Early Ordovician trilobite faunas of the Boat Harbour and Catoche Formations (St. George Group) in the Boat-Harbour-Cape Norman area, Great Northern Peninsula, western Newfoundland. Geological Survey Branch, Department of Mines and Energy, Newfoundland and Labrador, Report 89-2 1-168 [M. Hopkins/M. Hopkins]
35642 J. D. Loch. 2007. Trilobite biostratigraphy and correlation of the Kindblade Formation (Lower Ordovician) of Carter and Kiowa Counties, Oklahoma. Oklahoma Geological Survey Bulletin 149:1-154 [M. Hopkins/M. Hopkins]