The Dinosaur Park Formation contains dense concentrations of dinosaur skeletons, both articulated and disarticulated, which are often found with preserved remains of soft tissues. Remains of other animals such as fish, turtles, and crocodilians, as well as plant remains, are also abundant.[5] The formation has been named after Dinosaur Provincial Park, a UNESCOWorld Heritage Site where the formation is well exposed in the badlands that flank the Red Deer River.[2]
Geological setting
The Dinosaur Park Formation is composed of sediments that were derived from the erosion of the mountains to the west. It was deposited on an alluvial to coastal plain by river systems that flowed eastward and southeastward to the Bearpaw Sea, a large inland sea that was part of the Western Interior Seaway. That sea gradually inundated the adjacent coastal plain, depositing the marine shales of the Bearpaw Formation on top of the Dinosaur Park Formation.[4]
The Dinosaur Park Formation is about 70 metres (230 ft) thick at Dinosaur Park. The lower portion of the formation was laid down in fluvial channel environments and consists primarily of fine- to medium-grained, crossbeddedsandstones. The upper portion, which was deposited in overbank and floodplain environments, consists primarily of massive to laminated, organic-rich mudstones with abundant root traces, and thin beds of bentonite. The Lethbridge Coal Zone, which consists of several seams of low-rank coal interbedded with mudstones and siltstones, marks the top of the formation.[4]
The sediments of the Dinosaur Park Formation are similar to those of the underlying Oldman Formation and they were originally included in that formation. The two formations are separated by a regional disconformity, however, and are distinguished by petrographic and sedimentologic differences. In addition, articulated skeletal remains and bonebeds are rare in the Oldman Formation but abundant in the Dinosaur Park Formation.[2][4]
Biostratigraphy
The Dinosaur Park Formation can be divided into at least two distinct faunas. The lower part of the formation is characterized by the abundance of Corythosaurus and Centrosaurus. This group of species is replaced higher in the formation by a different ornithischian fauna characterized by the presence of Lambeosaurus and Styracosaurus.[6] The appearance of several new, rare species of ornithischian at the very top of the formation may indicate that a third distinct fauna had replaced the second during the transition into younger, non-Dinosaur Park sediments, at the same time an inland sea transgresses onto land, but there are fewer remains here. An unnamed pachyrhinosaur, Vagaceratops irvinensis, and Lambeosaurus magnicristatus may be more common in this third fauna.[7][8]
The timeline below follows a synthesis presented by Fowler (2017)[9] with additional information from Arbouret al. 2009,[10] Evans et al. 2009, and Penkalski, 2013.[11] Megaherbivore Assemblage Zones (MAZ) follow data presented by Mallon et al., 2012.[12]
Amphibians
Remains of the following amphibians have been found in the formation:[13]
Remains of the following dinosaurs have been found in the formation:[10][16]
Ornithischians
Remains of the following ornithischians have been found in the formation:[17]
Ankylosaurs
Ceratopsians
An unnamed Pachyrhinosaurus-like taxon has been recovered from the formation.[21]
Ornithopods
At least one indeterminate thescelosaurid specimen has been recovered from the formation.
In a 2001 review of hadrosaur eggshell and hatchling material from the Dinosaur Park Formation, Darren H. Tanke and M. K. Brett-Surman concluded that hadrosaurs nested in both the ancient upland and lowlands of the formation's depositional environment.[31]The upland nesting grounds may have been preferred by the less common hadrosaurs, like Brachylophosaurus or Parasaurolophus. However, the authors were unable to determine what specific factors shaped nesting ground choice in the formation's hadrosaurs. They suggested that behavior, diet, soil condition, and competition between dinosaur species all potentially influenced where hadrosaurs nested.[32]
Sub-centimeter fragments of pebbly-textured hadrosaur eggshell have been reported from the Dinosaur Park Formation. This eggshell is similar to the hadrosaur eggshell of Devil's Coulee in southern Alberta as well as that of the Two Medicine and Judith River Formations in Montana, United States.[33] While present, dinosaur eggshell is very rare in the Dinosaur Park Formation and is only found in two different microfossil sites.[31] These sites are distinguished by large numbers of pisidiidclams and other less common shelled invertebrates like unionid clams and snails. This association is not a coincidence as the invertebrate shells would have slowly dissolved and released enough basic calcium carbonate to protect the eggshells from naturally occurring acids that otherwise would have dissolved them and prevented fossilization.[33]
In contrast with eggshell fossils, the remains of very young hadrosaurs are actually somewhat common. Darren Tanke has observed that an experienced collector could actually discover multiple juvenile hadrosaur specimens in a single day. The most common remains of young hadrosaurs in the Dinosaur Park Formation are dentaries, bones from limbs and feet, as well as vertebral centra. The material showed little or none of the abrasion that would have resulted from transport, meaning the fossils were buried near their point of origin.[34] Bonebeds 23, 28, 47, and 50 are productive sources of young hadrosaur remains in the formation, especially bonebed 50. The bones of juvenile hadrosaurs and fossil eggshell fragments are not known to have preserved in association with each other, despite both being present in the formation.[35]
Pachycephalosaurs
Theropods
In the Dinosaur Park Formation, small theropods are rare due to the tendency of their thin-walled bones to be broken or poorly preserved.[42] Small bones of small theropods that were preyed upon by larger ones may have been swallowed whole and digested.[43] In this context, the discovery of a small theropod dinosaur with preserved tooth marks was especially valuable.[42] Possible indeterminate avimimid remains are known from the formation.
Ornithomimids
Oviraptorosaurs
Paravians
A new taxon of troodontid based solely on teeth is known from the upper part of the formation.[50]
Tyrannosaurs
Other reptiles
Choristoderes
Choristoderes, or champsosaurs, were aquatic reptiles. Small examples looked like lizards, while larger types were superficially similar to crocodilians. Remains of the following Choristoderes have been found in the formation:[58]
The following timeline displays valid taxa first discovered in the dinosaur park formation. Some species may have been referred to other genera subsequent to their initial description.
^Lexicon of Canadian Geologic Units: Dinosaur Park Formation Archived 2013-02-21 at archive.today
^ a b cEberth, D.A.; Hamblin, A.P. (1993). "Tectonic, stratigraphic, and sedimentologic significance of a regional discontinuity in the upper Judith River Group (Belly River wedge) of southern Alberta, Saskatchewan, and northern Montana". Canadian Journal of Earth Sciences. 30 (1): 174–200. Bibcode:1993CaJES..30..174E. doi:10.1139/e93-016.
^Ramezani, Jahandar; Beveridge, Tegan L.; Rogers, Raymond R.; Eberth, David A.; Roberts, Eric M. (2022-09-26). "Calibrating the zenith of dinosaur diversity in the Campanian of the Western Interior Basin by CA-ID-TIMS U–Pb geochronology". Scientific Reports. 12 (1): 16026. Bibcode:2022NatSR..1216026R. doi:10.1038/s41598-022-19896-w. ISSN 2045-2322. PMC 9512893. PMID 36163377.
^ a b c dEberth, D.A. 2005. The geology. In: Currie, P.J., and Koppelhus, E.B. (eds), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Indiana University Press: Bloomington and Indianapolis, p.54-82. ISBN 0-253-34595-2.
^Currie, P.J., and Koppelhus, E.B. (eds), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Indiana University Press: Bloomington and Indianapolis, p. 277-291. ISBN 0-253-34595-2.
^Mallon, Jordan C.; S, Jason (2012). "Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada". Palaeogeography, Palaeoclimatology, Palaeoecology. 350–352: 124–138. Bibcode:2012PPP...350..124M. doi:10.1016/j.palaeo.2012.06.024.
^Ryan and Evans (2005).
^ a bEvans D.C.; Bavington R.; Campione N.E. (2009). "An unusual hadrosaurid braincase from the Dinosaur Park Formation and the biostratigraphy of Parasaurolophus (Ornithischia: Lambeosaurinae) from southern Alberta". Canadian Journal of Earth Sciences. 46 (11): 791–800. Bibcode:2009CaJES..46..791E. doi:10.1139/E09-050.[permanent dead link]
^Fowler, Denver Warwick (2017-11-22). "Revised geochronology, correlation, and dinosaur stratigraphic ranges of the Santonian-Maastrichtian (Late Cretaceous) formations of the Western Interior of North America". PLOS ONE. 12 (11): e0188426. Bibcode:2017PLoSO..1288426F. doi:10.1371/journal.pone.0188426. ISSN 1932-6203. PMC 5699823. PMID 29166406.
^ a b c d e f g h i j k l m n o pArbour, V. M.; Burns, M. E.; Sissons, R. L. (2009). "A redescription of the ankylosaurid dinosaur Dyoplosaurus acutosquameus Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus". Journal of Vertebrate Paleontology. 29 (4): 1117–1135. Bibcode:2009JVPal..29.1117A. doi:10.1671/039.029.0405. S2CID 85665879.
^ a b cPenkalski, P. (2013). "A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA". Acta Palaeontologica Polonica. doi:10.4202/app.2012.0125.
^Mallon, J. C., Evans, D. C., Ryan, M. J., & Anderson, J. S. (2012). Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology.
^Gardner, J.D. 2005. Lissamphibians. In: Currie, P.J., and Koppelhus, E.B. (eds), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Indiana University Press: Bloomington and Indianapolis, p. 186-201. ISBN 0-253-34595-2.
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^Ryan, M.J., and Evans, D.C. 2005. Ornithischian dinosaurs. In: Currie, P.J., and Koppelhus, E.B. (eds), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Indiana University Press: Bloomington and Indianapolis, p. 312-348. ISBN 0-253-34595-2.
^ a b c d e f gPenkalski, Paul (2018). "Revised systematics of the armoured dinosaur Euoplocephalus and its allies". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 287 (3): 261–306. doi:10.1127/njgpa/2018/0717.
^"Table 17.1," in Weishampel, et al. (2004). Page 365.
^Penkalski, Paul (2013). "A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA". Acta Palaeontologica Polonica. doi:10.4202/app.2012.0125.
^Ryan, Michael; Eberth, David; Brinkman, Donald; Currie, Philip; Tanke, Darren (January 2010). New Perspectives on Horned Dinosaurs. pp. 141–155. Retrieved 16 January 2022.
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^"Conclusions," Tanke and Brett-Surman (2001). Page 212.
^ a b"Eggshell," Tanke and Brett-Surman (2001). Page 209.
^"Introduction," Tanke and Brett-Surman (2001). Page 208.
^"Discussion," Tanke and Brett-Surman (2001). Page 212.
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^ a b"Table 21.1," in Weishampel, et al. (2004). Page 465.
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