GSC 84342, Lac des Bois (2010 collection) (Cretaceous of Canada)

Where: Northwest Territories, Canada (66.9° N, 125.4° W: paleocoordinates 71.1° N, 69.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Early/Lower Turonian (93.5 - 89.3 Ma)

• By tracing the dipping slope of the sediments, the field party was able to determine the relative position of the cliff outcrop and the beach shales; the two form a continuous unit, with the shoreline shales being only a few centimeters below the concretion layer. Based on the macroinvertebrate fauna, primarily ammonites and inoceramid pelecypods, the shales and concretions are early Turonian in age (Jeletzky, 1969, report in Cook and Aitken, 1971; Yorath and Cook, 1981; Cumbaa and Murray, 2008), and were deposited in an open marine environment during a transgressive sequence that was initiated in the Albian (Yorath and Cook, 1981; Cumbaa and Murray, 2008).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified shale and lithified, concretionary siltstone

• The environment at Lac des Bois during the early Turonian was open marine (Yorath and Cook, 1981), with the probability of widespread and persistent bottom layer anoxia (Schroder-Adams et al., 1996). Sea level at the time was near highstand, with waters at maximum depth in the Western Interior Seaway, and depth at the locality was likely in the tens of meters or greater (Cumbaa and Murray, 2008).

Size class: macrofossils

Preservation: mold/impression

Collected by A.M. Murray, S.L. Cumbaa, R. Day, R. Holmes in 2010

• Repository: University of Alberta Laboratory for Vertebrate Palaeontology (UALVP) and the Canadian Museum of Nature (CMN).

Primary reference: A. M. Murray. 2016. Mid-Cretaceous acanthomorph fishes with the description of a new species from the Turonian of Lac des Bois, Northwest Territories, Canada. Vertebrate Anatomy Morphology Palaeontology 1(1):101-115 [M. Clapham/J. Mordaunt/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 220881: authorized by Matthew Clapham, entered by Josh Mordaunt on 22.06.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Actinopteri
 Teleostei -
Avitosmerus canadensis2
Avitosmerus canadensis2 Fielitz 2002
Holotype: CMN 17456
 Acanthomorphata -
"Acanthomorpha indet." = Acanthomorphata1
"Acanthomorpha indet." = Acanthomorphata1 Rosen 1973
CMN 54970
 Polymixiiformes -
Cumbaaichthys oxyrhynchus n. sp.
Cumbaaichthys oxyrhynchus n. sp. Murray 2016 beardfish
UALVP 56113 - Holotype
 Polymixiiformes - Boreiohydriidae
Boreiohydrias dayi n. sp.1
Boreiohydrias dayi n. sp.1 Murray and Cumbaa 2013 beardfish
UALVP 54046 - Holotype
Aquilopiscis wilsoni
  -
Aquilopiscis wilsoni2
Aquilopiscis wilsoni2 Cumbaa and Murray 2008
Holotype: CMN 17444
1Murray and Cumbaa 2013; 2Murray and Cumbaa 2015