B1 boulder bed, Broom Point South (Ordovician of Canada)

Where: Newfoundland and Labrador, Canada (49.8° N, 57.9° W: paleocoordinates 33.5° S, 52.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Symphysurina trilobite zone, Broom Point Member (Green Point Formation), Tremadocian (485.4 - 477.7 Ma)

• 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.

Environment/lithology: grainstone and mudstone

• Deposited in offshore/slope environment (Green Point Formation) but source is closer to shore.
• James and Stevens 1986, p. 127: "A compound, welded unit...mainly tabular clasts (average 10x30 cm) of both grainstone and mudstone..."

Size class: macrofossils

Collected by R. A. Fortey, D. Skevington

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 105854: authorized by Melanie Hopkins, entered by Melanie Hopkins on 26.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Proetida - Hystricuridae
Millardicurus "sp. A"1 Adrain and Westrop 2006 trilobite
 Proetida - Dimeropygidae
"Hystricurus paucituberculatus n. sp." = Tulepyge paucituberculata2
"Hystricurus paucituberculatus n. sp." = Tulepyge paucituberculata2 Fortey 1983 trilobite
 Corynexochida - Missisquoiidae
Lunacrania spicata2 Fortey 1983 trilobite
 Olenida - Olenidae
Parabolinella cf. hecuba Walcott 1924 trilobite
 Asaphida - Nileidae
Symphysurina brevis2, "Symphysurina brevispicata" = Symphysurina walcotti
Symphysurina brevis2 Fortey 1983 trilobite
"Symphysurina brevispicata" = Symphysurina walcotti Kindle 1929 trilobite
 Ptychopariida - Catillicephalidae
Calculites stevensi2 Fortey 1983 trilobite
Artiopoda
 Agnostida - Diplagnostidae
Pseudagnostus sp. Jaekel 1909
 Agnostida - Agnostidae
Neoagnostus aspidoides Kobayashi 1955