RTMP BB 88 (Cretaceous of Canada)

Also known as DPP Bonebed 88

Where: Alberta, Canada (50.8° N, 111.5° W: paleocoordinates 58.1° N, 76.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Dinosaur Park Formation (Belly River Group), Late/Upper Campanian (83.5 - 70.6 Ma)

• Eberth lists this as one of the vertebrate micro fossil sites from the Judith River, but does not give a meter mark for the site. (Microvertebrate sites of Brinkman (1990) are "...placed in stratigraphic sequence by reference to a disconformity located about sixty meters below the base of the Lethbridge Coal (Eberth, 1990). BB 88 is not mentioned in Brinkman (1990), but a detailed geologic description is given for the site, including mention of microvertebrates, see below.

• bed-level stratigraphic resolution

Environment/lithology: "channel"; lag, fine-grained, medium, intraclastic sandstone and sandy, carbonaceous siltstone

• Characterized as in-channel, coastal plain. Facies association = Inclined heterolithic stratification (IHS) "comprising inclined decimeter-scale sandstone/mudstone interbeds (Thomas et al. 1987), has been interpreted as a lateral accretion deposit in fluvial (Wood, 1985) and tidally-influenced coastal-plain channels (Koster and Currie, 1987; Wood et al., 1988)." Upper flow-regime, tractional plane beds fromed during flood stage. Lag deposits, or plane bed deposits that show horizontal-planar stratification, bed thicknesses exceeding single pebble diameters, normal graded or fining upward texture, and matrix-supported clasts. The disconformity in southern Alberta records a Cordilleran uplift event west of the Park. (Eberth, 1990)
• "BB 88 occurs within a multistoried IHS sequence. At the microfossil site, the lithosome comprises low-angle-inclined interbeds of massive-to-contorted, fine-to-medium-grained sandstones and carbonaceous, sandy siltstones (Fig. 7D). Fossils occur within an intraclast deposit at the base of a 20 cm thick structureless sandstone."

Size classes: macrofossils, mesofossils

Collected by P. J. Currie in 1986-1989; reposited in the TMP

Collection methods: bulk, surface (float), sieve,

• Screenwashed elements were collected using a screen with 9 openings per centimeter.

Primary reference: D. A. Eberth. 1990. Stratigraphy and sedimentology of vertebrate microfossil sites in the uppermost Judith River Formation (Campanian), Dinosaur Provincial Park, Alberta, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology 78:1-36 [A. Behrensmeyer/A. Behrensmeyer/M. Kosnik]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 45263: authorized by John Alroy, entered by Robin Whatley on 15.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• It would seem that the taxonomic list for this site was not included in Brinkman (1990), either by accident, or because none of the fossils were identifiable...?
Show authors, comments, and common names
unclassified
  -
Vertebrata indet.
Vertebrata indet. Lamarck 1801