Prince Creek Formation

The Prince Creek Formation is a geological formation in Alaska with strata dating to the Early Maastrichtian. Dinosaur remains are among the fossils that have been recovered from the formation.[2]

Prince Creek Formation Stratigraphic range: Early Maastrichtian 70.6–69.1 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
General location of the Prince Creek Formation, in red
Type	Geological formation
Unit of	Colville Group
Sub-units	Kikak-Tegoseak Quarry, Kogosukruk Tongue, Ocean Point, Coleville River Bluff
Underlies	Sagavanirktok Formation
Overlies	Schrader Bluff Formation
Lithology
Primary	Sandstone, mudstone[1]
Other	siltstone, carbonaceous shale, ash-fall[1]
Location
Coordinates	70.0°N 151.5°W
Approximate paleocoordinates	83.2°N 115.9°W
Region	Alaska
Country	USA

Age

The Prince Creek Formation aged from 80 to 61.7 million years ago. The Kikak-Tegoseak Quarry, where almost all of the dinosaur fossil are from, is located near the middle of the formation, and is about 70.6 to 69.1 million years ago.[3][4] A lower section, the Kogosukruk Tongue, ages from 72 to 71 million years ago, in the latest Campanian.[5] The youngest part of the formation is Ocean Point, which extends into the Paleogene, at the end of the Danian, based on the age of ostracods and mollusks.[6] In the middle of the formation is the Coleville River Bluff, which extends from the Late Campanian to the Middle/Late Maastrichtian, in which pollen spores are common.[7] However, a recent study dated all of the Prince Creek to the Early Maastrichtian.[8]

Habitat

Hadrosaurids of the Liscomb Bonebed in their habitat

During the time when the Prince Creek Formation was deposited, Earth was going through a greenhouse phase. The rocks in it are alluvial, and were, at the time of burial, on a muddy coastal plain. Leafy plants, roots and pollen are known from the formation, and they show that trampling by dinosaurs was common. It can be proven that during the Maastrichtian the Prince Creek Formation bordered a large body of water by the presence of gypsum and pyrite in nearby rock. Large amounts of plants material are represented by peridonoid dinocysts, algae, fungal hyphae, fern and moss spores, projectates, Wodehouseia edmontonicola, hinterland bisaccate pollen, and pollen from trees, shrubs, and herbs. Concluded on the large amounts of dinosaurs and flora, the Prince Creek Formation was likely a polar woodland lacking ground ice with dinosaurs dominating and angiosperms towering above them. The mean temperature was 5 to 6 °C (41 to 43 °F), with the mean temperature during the cold months being 2 to 4 °C (36 to 39 °F) and the mean temperature during the warm months being 10 to 12 °C (50 to 54 °F). Mean annual precipitation was 500 to 1,500 millimetres (20 to 59 in)/year.[1]

Vertebrate paleofauna

Theropods

Indeterminate tyrannosaurid remains are present, mostly in the form of teeth. The teeth are from the Kikak-Tegoseak Quarry, Liscomb Quarry, and Byers Bed, totaling 8 teeth.[9]

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Theropods
Genus	Species	Location	Abundance	Notes	Images
Dromaeosaurus[9][10]	D. cf albertensis[9][10]	Liscomb Quarry[9] Kikak-Tegoseak Quarry[9] Byers Bed[9]	Fossilized teeth[9]	A dromaeosaur.
Gruipeda[11]	G. vegrandiunis[11]	Denali Park[11]		Footprints from a small bird.[11]
Ornithomimosauria indet.[12]	Indeterminate[12]	Old Bone Beach	Distal metatarsal IV	Possibly an ornithomimid.
Saurornitholestinae indet.[13]	Indeterminate	Pediomys Point - Liscomb Quarry[13]	Small dentary tip from a juvenile.[13]	A new species of dromaeosaurid closely related to Saurornitholestes.[13]
Nanuqsaurus[3]	N. hoglundi[3]	Kikak-Tegoseak Quarry[3]	One partial skull including a bone near the front of the maxilla and the front of the lower jaw.[3]	Nanuqsaurus is a dwarf tyrannosaurid closely related to Lythronax, Tyrannosaurus, and Tarbosaurus.[3]
Saurornitholestes[9][10]	S. cf. langstoni[9][10]	Old Bone Beach[9]	Teeth[9]	A dromaeosaur.
Troodon[3]	T. sp[3]	Kikak-Tegoseak Quarry[3] Liscomb Quarry[9] Byers Bed[9] Magical Mystery Bar[14]	Dental remains,[3] including teeth.[9] Braincases have also been found.[14]	Remains of T. sp. are approximately 50% larger than specimens from Alberta and Montana.[3] Remains were previously assigned to T. formosus.[10] The most abundant theropod.[14] As of 2011, a dubious genus.[15]

Ornithischians

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ornithischians of the Prince Creek Formation
Genus	Species	Location	Abundance	Notes	Images
Alaskacephale[16]	A. gangloffi[16]	Kogosukruk Tongue[17]	A squamosal, and the back of the dome.[5]	The first pachycephalosaurine from Alaska discovered.[5]
Pachyrhinosaurus[4][18]	P. perotorum[4][18]	Kikak-Tegoseak Quarry[4]	An abundance of skeletal remains,[4] including an immature juvenile.[18]	The youngest of the Pachyrhinosaurus species, found in one of the highest latitudes of centrosaurine discoveries.[4] A discovery in the Kikak-Tegoseak Quarry was identified in 2013 as a juvenile of Pachyrhinosaurus perotorum. This discovery shows that the crest started to develop in the front of the snout, then extending farther back until it reaches the eye.[18]
Thescelosaurinae indet.[19]	Indeterminate		Teeth[19]	Remains previously attributed to Thescelosaurus.[19]
Edmontosaurus[20]	E. sp[20]	Liscomb Bonebed[20] Kikak-Tegoseak Quarry[4]	Juvenile specimens	Originally identified under the genus Ugrunaaluk, recent studies have shown that disarticulated juvenile specimens, originally assigned to this genus has been found ontogenetically indistinguishable from Edmontosaurus.[20]
Lambeosaurinae indet.[21]	Indeterminate	Liscomb Bonebed	A supraoccipital	The first confirmed lambeosaurine in the Prince Creek Formation.
Ornithopoda indet.[19]	Indeterminate[19]		One tooth[19]	A single "hypsilophodontid" cheek tooth not attributable to Parksosaurus or Thescelosaurus.[19]

Mammals

Mammals of the Prince Creek Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Unnuakomys[22]	U. hutchisoni	Pediomys Point	Lower Maastrichtian	Over 60 specimens	A small metatherian.

Plants

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Plants of the Prince Creek Formation[7]
Genus	Species	Location	Abundance	Notes	Images
Parataxodium[17]	P. wigginsii[17]	Kogosukruk Tongue[17]		A conifer, one of two from the region.[17] It dominated the forest community of the Kogosukruk Tongue.
Hollickia[17]	H. quercifolia[17]	Kogosukruk Tongue[17]	Leaves[17]	An angiosperm, known from leaves.[17]
Quereuxia[17]	Q. angulata[17]	Kogosukruk Tongue[17]		An aquatic angiosperm.[17]
Equisetites[17]	E. sp.[17]	Kogosukruk Tongue[17]		A sphenophyte.[17]
Pulcheripollenites	P. krempii	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
cf. Proteacidites	cf. P. sp.	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
cf. Polycingulatisporites	cf. P. reduncus	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
Podocarpidites	P. sp.	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
Ovoidites	O.? sp.	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
	O. sp.	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
	O. parvus	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
	O. arcticus	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
Osmundacidites	O. wellmanii	Coleville River Bluff	Pollen remains	Common in the Early Maastrichtian. Also found in the Schrader Bluff Formation.
Mantonisporites	M. sp. indet	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Mancicorpus	M. pseudosenonicus	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Lycopodiacidites	L. sp.	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Lunatadinium	L. dissolutum	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Indeterminate	Indeterminate	Coleville River Bluff	Septate fungal hypha.	Also found in the Schrader Bluff Formation.
Leosphaeridia	L. "stellata"	Coleville River Bluff	Pollen remains	Common in the Early Maastrichtian. Also found in the Schrader Bluff Formation.
Lairidordites	L. magnus	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Laegivatosporites	L. spp.	Coleville River Bluff	Pollen remains	Indeterminate remains abundant in the Early Maastrichtian, and still numerous in the Late Maastrichtian. Also found in the Schrader Bluff Formation.
	L. sp.	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Kurtzipites	K. trispissatus	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Integricorpus	I. sp.	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Ischyosporites	I. sp.	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Ischyosporites	I. sp.	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Inundatisporis	I. tappaniae	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Impardecispora	I. marylandensis	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Hannisporis	H. scollardensis	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
	H. amplus	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Gleicheniidites	G. senonicus	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Foveosporites	F sp.	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Foraminisporis	F. undulosus	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Fibulapollis	F. scabratus	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Expressipollis	cf. E. accuratus	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Erdtmannipollis	E. procumbentformis	Coleville River Bluff	Pollen spores	Also found in the Schrader Bluff Formation.
Dictyophyllidites	D. sp.	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Deltoidospora	D. spp.	Coleville River Bluff	Preserved pollen samples	Very abundant in the early Maastrichtian and Indeterminate level of the formation, becoming rarer until the Middle/Late Maastrichtian. Also found in the Schrader Bluff Formation.
Cycadopites	C. fragilis	Coleville River Bluff	Samples of distinct pollen	Also found in the Schrader Bluff Formation.
Crassispora?	cf. C. apisulacea	Coleville River Bluff	Pollen samples	Also found in the Schrader Bluff Formation.
cf. Converrucosisporites	cf. C. sp.	Coleville River Bluff	Specimens of preserved pollen spores	Also found in the Schrader Bluff Formation.
Clavatisporites	C. sp.	Coleville River Bluff	Preserved pollen samples	Also found in the Schrader Bluff Formation.
Circulodinium	C. sp.	Coleville River Bluff	Pollen samples	Also found in the Schrader Bluff Formation.
Cingutriletes	cf. C. congruens	Coleville River Bluff	Pollen remains	Also found in the Schrader Bluff Formation.
Cingulizonates	C. bialatus	Coleville River Bluff	Pollen samples	Also found in the Schrader Bluff Formation.
Cicatricosisporites	C. sp. 1	Coleville River Bluff	Distinct pollen remains	Also found in the Schrader Bluff Formation.
	C. spp.	Coleville River Bluff	Preserved pollen	Also found in the Schrader Bluff Formation.
	cf. C. dorogensis	Coleville River Bluff	Fossilized pollen spores	Also found in the Schrader Bluff Formation.
Cibotiumspora	C. sp.	Coleville Bluff Formation	Pollen spores	Also found in the Schrader Bluff Formation.
Camarozonosporites	C. ambigens	Coleville River Bluff	Pollen specimens	Also found in the Schrader Bluff Formation.
Botryococcus	B. braunii	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
Indeterminate	Indeterminate	Coleville River Bluff	Bissacate gymnosperm pollen	Common and abundant in the Early Maastrichtian, becoming rarer towards the Late Maastrichtian. Also found in the Schrader Bluff Formation.
Balmeisporites	B. sp.	Coleville River Bluff	Pollen spore remains	Also found in the Schrader Bluff Formation.
Azonia	cf. A. cribrata	Coleville River Bluff	Carbonized pollen	Also found in the Schrader Bluff Formation.
Aquilapollenites	A. trialatus	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
	A. spp.	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
	A. sp.	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
	cf. A. dentatus	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
	A. amygdaloides	Coleville River Bluff	Pollen	Numerous in the Late Campanian, becoming abundant in the Maastrichtian. Also found in the Schrader Bluff Formation.
Annulispora	A. sp.	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
Anacololsidites	A. sp. 1	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
	A. sp.	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
Alete	A. clavate	Coleville River Formation	Pollen	Also found in the Schrader Bluff Formation.
Aequitriradites	cf. A. spinulosus	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.
Aequitriradite	A. sp.	Coleville River Bluff	Pollen	Also found in the Schrader Bluff Formation.

See also

• List of dinosaur-bearing rock formations

References

1. Flaig, P.P.; McCarthy, P.J.; Fiorillo, A.R. (2013). "Anatomy, Evolution, and Paleoenvironmental Interpretation of an Ancient Arctic Coastal Plain: Integrated Paleopedology and Palynology from the Upper Cretaceous (Maastrichtian) Prince Creek Formation, North Slope, Alaska, USA". In Driese, S.G.; Nordt, L.C. (eds.). New Frontiers in Paleopedology and Terrestrial Paleoclimatology: Paleosols and Soil Surface Analog Systems. SEPM Special Publication. 104. pp. 179–230. doi:10.2110/sepmsp.104.14. ISBN 9781565763227.
2. Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
3. Fiorillo, A. R.; Tykoski, R. S. (2014). Dodson, Peter (ed.). "A Diminutive New Tyrannosaur from the Top of the World". PLoS ONE. 9 (3): e91287. Bibcode:2014PLoSO...991287F. doi:10.1371/journal.pone.0091287. PMC 3951350. PMID 24621577.
4. Fiorillo, A.R.; Tykoski, R.S.T. (2012). "A new species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope (Prince Creek Formation: Maastrichtian) of Alaska". Acta Palaeontologica Polonica. 57 (3): 561–573. doi:10.4202/app.2011.0033.
5. Gangloff, R.A.; Fiorillo, A.R.; Norton, D.W. (2005). "The First Pachycephalosaurine (Dinosauria) from the Paleo-Arctic of Alaska and its Paleogeographic Implications". Journal of Paleontology. 79 (5): 997–1001. doi:10.1666/0022-3360(2005)079[0997:tfpdft]2.0.co;2.
6. Marincovich, L.; Brouwers, E. M.; Carter, L. D. (1985). "Early Tertiary marine fossils from northern Alaska: Implications for Arctic Ocean paleogeography and faunal evolution". Geology. 13 (11): 770. Bibcode:1985Geo....13..770M. doi:10.1130/0091-7613(1985)13<770:ETMFFN>2.0.CO;2.
7. Flores, R.M.; Myers, M.D.; Houseknecht, D.W.; Stricker, G.D.; Brizzolara, D.W.; Ryherd, T.J.; Takahashi, K.I. (2007). "Stratigraphy and Facies of Cretaceous Schrader Bluff and Prince Creek Formations in Colville River Bluffs, North Slope, Alaska" (PDF). U.S. Geological Survey Professional Paper. 1748: 52.
8. Flaig, Peter P.; Mccarthy, Paul J.; Fiorillo, Anthony R. (2011), "A Tidally Influenced, High-Latitude Coastal-Plain: The Upper Cretaceous (Maastrichtian) Prince Creek Formation, North Slope, Alaska", From River to Rock RecordThe preservation of fluvial sediments and their subsequent interpretation, SEPM Society for Sedimentary Geology, doi:10.2110/sepmsp.097.233, ISBN 978-1-56576-305-0, retrieved 2020-10-13
9. Fiorillo, A.R.; Gangloff, R.A. (2000). "Theropod Teeth from the Prince Creek Formation (Cretaceous) of Northern Alaska, with Speculations on Arctic Dinosaur Paleoecology". Journal of Vertebrate Paleontology. 20 (4): 675–682. doi:10.1671/0272-4634(2000)020[0675:ttftpc]2.0.co;2.
10. "3.33 Alaska, United States; 3. Prince Creek Formation," in Weishampel, et al. (2004). Page 587.
11. Fiorillo, A. R.; Hasiotis, S. T.; Kobayashi, Y.; Breithaupt, B. H.; McCarthy, P. J. (2011). "Bird tracks from the Upper Cretaceous Cantwell Formation of Denali National Park, Alaska, USA: a new perspective on ancient northern polar vertebrate biodiversity". Journal of Systematic Palaeontology. 9 (1): 33–49. doi:10.1080/14772019.2010.5093566 (inactive 2021-01-14).CS1 maint: DOI inactive as of January 2021 (link)
12. Watanabe, Akinobu; Erickson, Gregory M.; Druckenmiller, Patrick S. (2013-09-01). "An ornithomimosaurian from the Upper Cretaceous Prince Creek Formation of Alaska". Journal of Vertebrate Paleontology. 33 (5): 1169–1175. doi:10.1080/02724634.2013.770750. ISSN 0272-4634. S2CID 130049294.
13. Chiarenza, A. A.; Fiorillo, A. R.; Tykoski, R. S.; McCarthy, P. J.; Flaig, P. P.; Contreras, D. L. (2020). "The first juvenile dromaeosaurid (Dinosauria: Theropoda) from Arctic Alaska". PLOS ONE. 15 (7): e0235078. doi:10.1371/journal.pone.0235078. PMC 7343144. PMID 32639990.
14. Fiorillo, A.R.; Tykoski, R.S.; Currie, P.J.; Mccarthy, P.J.; Flaig, P. (2009). "Description of two partial Troodon braincases from the Prince Creek Formation (Upper Cretaceous), North Slope Alaska". Journal of Vertebrate Paleontology. 29 (1): 178–187. doi:10.1080/02724634.2009.10010370. S2CID 197535475.
15. Zanno, Lindsay E.; Varricchio, David J.; O'Connor, Patrick M.; Titus, Alan L.; Knell, Michael J. (2011-09-19). "A New Troodontid Theropod, Talos sampsoni gen. et sp. nov., from the Upper Cretaceous Western Interior Basin of North America". PLOS ONE. 6 (9): e24487. Bibcode:2011PLoSO...624487Z. doi:10.1371/journal.pone.0024487. ISSN 1932-6203. PMC 3176273. PMID 21949721.
16. Sullivan, R.M. (2006). "A taxonomic review of the Pachycephalosauridae (Dinosauria: Ornithischia)". New Mexico Museum of Natural History and Science Bulletin. 35: 347–365.
17. Spicer, R.A.; Parrish, J.T. (1987). "Plant Megafossils, Vertebrate Remains, and Paleoclimate of the Kogosukruk Tongue (Late Cretaceous), North Slope, Alaska". In Hamilton, Thomas D.; Galloway, John P. (eds.). Geologic Studies in Alaska. U.S. Geological Survey Circular. pp. 47–48.
18. Fiorillo, A.R.; Tykoski, R.S. (2013). Farke, Andrew A. (ed.). "An Immature Pachyrhinosaurus perotorum (Dinosauria: Ceratopsidae) Nasal Reveals Unexpected Complexity of Craniofacial Ontogeny and Integument in Pachyrhinosaurus". PLoS ONE. 8 (6): e65802. Bibcode:2013PLoSO...865802F. doi:10.1371/journal.pone.0065802. PMC 3686821. PMID 23840371.
19. Brown, C.M.; Druckenmiller, P. (2011). "Basal ornithopod (Dinosauria: Ornithischia) teeth from the Prince Creek Formation (early Maastrichtian) of Alaska". Canadian Journal of Earth Sciences. 48 (9): 1342–1354. Bibcode:2011CaJES..48.1342B. doi:10.1139/e11-017.
20. Re-examination of the cranial osteology of the Arctic Alaskan hadrosaurine with implications for its taxonomic status Ryuji Takasaki, Anthony R. Fiorillo, Ronald S. Tykoski, Yoshitsugu Kobayashi.
21. McCarthy, Paul J.; Tykoski, Ronald S.; Kobayashi, Yoshitsugu; Fiorillo, Anthony R.; Takasaki, Ryuji (2019-03-29). "The First Definite Lambeosaurine Bone From the Liscomb Bonebed of the Upper Cretaceous Prince Creek Formation, Alaska, United States". Scientific Reports. 9 (1): 5384. Bibcode:2019NatSR...9.5384T. doi:10.1038/s41598-019-41325-8. ISSN 2045-2322. PMC 6440964. PMID 30926823.
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Bibliography

• Flaig, P.P. (2010). "Depositional Environments of the Late Cretaceous (Maaastrichtian) Dinosaur-Bearing Prince Creek Formation: Colville River Region, North Slope, Alaska". Unpublished Ph.D. Dissertations, the University of Alaska-Fairbanks: 311.
• Flaig, P.P.; McCarthy, P.J.; Fiorillo, A.R. (2011). "From River to Rock Record: The Preservation of Fluvial Sediments and their Subsequent Interpretation". SEPM Special Publication. 97: 233–264. |chapter= ignored (help)
• Flaig, P.P.; Fiorillo, A.R.; McCarthy, P.J. (2014). "Dinosaur-bearing hyperconcentrated flows of Cretaceous Arctic Alaska—Recurring catastrophic event beds on a distal paleopolar coastal plain". PALAIOS. 29 (11): 594–611. Bibcode:2014Palai..29..594F. doi:10.2110/palo.2013.133. S2CID 128713816.
• Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.