RTMP BB 25 (Cretaceous of Canada)

Also known as Bonebed 25, DPP

Where: Alberta, Canada (50.7° N, 111.5° W: paleocoordinates 58.0° N, 76.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• 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). The stratigraphic position of each site is expressed in terms of meteres above or below the disconformity (Fig. 2, Brinkman, 1990)" where positive numbers are above and negative below.

• bed-level stratigraphic resolution

Environment/lithology: channel lag; medium-grained, pebbly, intraclastic, silty sandstone

• Characterized as in-channel, coastal plain. Facies association = trough cross-stratified sandstones. 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.
• "BB 25 comprises a 20 cm thick deposit of silty, medium-grained sandstone with ironstone and mudstone pebbles and vertebrate fossils that occupies a position 1 m abover the erosional base of a 5.5 m thick multistoried sandstone body." (Eberth, 1990)

Size classes: macrofossils, mesofossils

Collected by P. Dodson, L. J. Strong & P. J. Currie in 1985; 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. B. Brinkman. 1990. Paleontology of the Judith River Formation (Campanian) of Dinosaur National Park, Alberta, Canada: evidence from vertebrate microfossil locality. Palaeogeography, Palaeoclimatology, Palaeoecology 78:37-54 [A. Behrensmeyer/A. Behrensmeyer/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 45238: authorized by John Alroy, entered by Robin Whatley on 14.10.2004, edited by Matthew Carrano and John Alroy

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
Gnathostomata
  -
Actinopteri
 Acipenseriformes - Acipenseridae
Acipenser albertensis Lambe 1902 sturgeon
 Teleostei -
 Teleostei - Aspidorhynchidae
 Elopiformes - Phyllodontidae
Paralbula casei Estes 1969
 Albuliformes - Albulidae
Coriops amnicolus Estes 1969 bonefish
 Salmoniformes -
Esocoidea indet. Bleeker 1859
 Amiiformes - Amiidae
"Kindleia sp." = Cyclurus
"Kindleia sp." = Cyclurus Agassiz 1843 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
may be same as Atractosteus occidentalis in Table 1?
Osteichthyes
 Salientia -
 Proteida - Batrachosauroididae
Opisthotriton kayi Auffenberg 1961 salamander
 Caudata - Urodela
Scapherpeton tectum Cope 1876 salamander
Reptilia
 Testudines - Trionychidae
Trionychinae indet.1 softshell turtle
 Testudines - Panchelydridae
 Theropoda -
 Avetheropoda - Dromaeosauridae
cf. Dromaeosauridae indet. Colbert and Russell 1969 coelurosaur
Richardoestesia sp.2 Currie et al. 1990 coelurosaur
Saurornitholestes langstoni Sues 1978 coelurosaur
 Avetheropoda - Troodontidae
Troodon sp.2 Leidy 1856 coelurosaur
 Ornithischia -
Ankylosauria indet. ornithischian
 Neornithischia - Ceratopsidae
Ceratopsidae indet. Marsh 1888 ceratopsid
 Neornithischia - Hadrosauridae
Hadrosauridae indet. Cope 1869 hadrosaurid
 Crocodylia -
Leidyosuchus canadensis Lambe 1907 crocodilian
 Squamata -
 Choristodera -
Champsosaurus natator Parks 1933 choristodere
Mammalia
  -
Mammalia indet. Linnaeus 1758 mammal
 Allotheria -
Multituberculata indet.2 Cope 1884 multituberculate