Where: Northwest Territories, Canada (60.0° N, 117.0° W: paleocoordinates 60.2° N, 61.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Loon River Formation, Middle Albian (109.0 - 105.3 Ma)

• "New biostratigraphic data and correlation with the Spirit River Formation indicate that the lower Loon River Formation is of Early to Middle Albian age. In contrast, the Peace River-upper Loon River interval is thicker to the north. Initial mapping of discontinuities within the upper Loon River Formation indicates that it may consist of a series of northward offlapping sedimentary wedges. New U-Pb and 40Ar/39Ar ages for two bentonite beds, age-diagnostic dinocysts, and foraminifera of the Haplophragmoides multiplum Subzone indicate a Middle Albian age for the basal part of the upper Loon River Formation and confirm wireline-log correlation with the basal Harmon Member of the Peace River Formation to the south. The age of the uppermost part of the upper Loon River Formation is less certain. Foraminifera indicative of the Late Albian Miliammina manitobensis Zone and Late Albian dinocysts in samples from the overlying Shaftesbury Formation provide an upper age limit, and these strata may be as young as Upper Albian." (Hathway et al., 2013). Based on the location of the collection relative to the mapped area of the formation, it likely comes from the middle part of the upper Loon River Formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

• material is "articulated" and includes "embryos... located within the body cavity of an adult, presumably the mother"

Preservation: adpression

Collected by L. Allan Lindoe

• Repository: University of Alberta

Primary reference: E. E. Maxwell and M. W. Caldwell. 2003. First record of live birth in Cretaceous ichthyosaurs: closing an 80 million year gap. Proceedings of the Royal Society of London B 270:S104-S107 [J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 94490: authorized by John Alroy, entered by John Alroy on 22.02.2010, edited by Hallie Street, Mark Uhen and Matthew Clapham

Creative Commons license: CC BY (attribution)