B1 boulder bed, Broom Point South: Tremadocian, Canada
collected by R. A. Fortey, D. Skevington

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Agnostida - Diplagnostidae
Pseudagnostus sp. Jaekel 1909
Agnostida - Agnostidae
Neoagnostus aspidoides Kobayashi 1955
Trilobita - Olenida - Olenidae
Parabolinella cf. hecuba (Walcott 1924)
Trilobita - Proetida - Hystricuridae
Hystricurus millardensis Hintze 1953
    = Millardicurus informal sp. A Adrain and Westrop 2006
Adrain and Westrop 2006
Trilobita - Proetida - Dimeropygidae
Hystricurus sp. Raymond 1913
    = Hystricurus paucituberculatus n. sp. Fortey 1983
Fortey 1983
Trilobita - Corynexochida - Missisquoiidae
Lunacrania spicata Fortey 1983
Fortey 1983
Trilobita - Asaphida - Nileidae
Symphysurina brevispicata Hintze 1953
Symphysurina brevis Fortey 1983
Fortey 1983
Trilobita - Ptychopariida - Catillicephalidae
Calculites stevensi Fortey 1983
Fortey 1983
see common names

Geography
Country:Canada State/province:Newfoundland and Labrador
Coordinates: 49.8° North, 57.9° West (view map)
Paleocoordinates:3.3° North, 82.5° West (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Ordovician Epoch: Early Ordovician
Stage: Tremadocian 10 m.y. bin: Ordovician 1
Key time interval: Tremadocian Trilobite zone:  Symphysurina
Age range of interval: 485.4 - 477.7 m.y. ago
Stratigraphy
Geological group:Cow Head Formation:Green Point Member:Broom Point
Stratigraphy comments: Local section is Broom Point South but meterage not reported in Fortey et al 1982; this bed is at 184.4 m in the section measured by James and Stevens 1986.
Lithology and environment
Primary lithology: grainstone
Secondary lithology: mudstone
Lithology description: James and Stevens 1986, p. 127: "A compound, welded unit...mainly tabular clasts (average 10x30 cm) of both grainstone and mudstone..."
Environment:carbonate indet.
Geology comments: Deposited in offshore/slope environment (Green Point Formation) but source is closer to shore.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Collectors:R. A. Fortey, D. Skevington
Metadata
Database number:105854
Authorizer:M. Hopkins Enterer:M. Hopkins
Modifier:J. Alroy Research group:marine invertebrate
Created:2011-02-26 05:19:20 Last modified:2025-02-22 15:12:02
Access level:the public Released:2011-02-26 05:19:20
Creative Commons license:CC0
Reference information

Primary reference:
35330. R. A. Fortey, E. Landing, and D. Skevington. 1982. Cambrian-Ordovician boundary sections in the Cow Head Group, western Newfoundland. In M. G. Bassett, W. T. Dean (eds.), The Cambrian-Ordovician boundary: sections, fossil distributions, and correlations. National Museum of Wales, Geological Series No. 3, Cardiff 95-129 [M. Hopkins/M. Hopkins/M. Hopkins]

Secondary references:

35518 J. M. Adrain and S. R. Westrop. 2006. New earliest Ordovician trilobite genus Millardicurus: the oldest known hystricurid. Journal of Paleontology 80(4):650-671 [M. Hopkins/M. Hopkins]
35444 R. A. Fortey. 1983. Cambrian-Ordovican trilobites from the boundary beds in western Newfoundland and their phylogenetic significance. in D. E. G. Briggs and P. D. Lane, eds, Trilobites and other Early Arthropods, Special Papers in Palaeontology 30 179-211 [M. Hopkins/M. Hopkins]
35331 R. A. Fortey and D. Skevington. 1980. Correlation of Cambrian-Ordovician boundary between Europe and North America: new data from western Newfoundland. Canadian Journal of Earth Sciences 17(3):382-388 [M. Hopkins/M. Hopkins]
35329 N. P. James and R. K. Stevens. 1986. Stratigraphy and correlation of the Cambro-Ordovician Cow Head Group, western Newfoundland. Geological Survey of Canada Bulletin 366:1-143 [M. Hopkins/M. Hopkins]