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Osteology of a large allosauroid theropod from the Upper Jurassic (Tithonian) Morrison Formation of Colorado, USA

Dalman S.

Volumina Jurassica

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2014

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Vol. 12, no. 2

159--180

EN

Two partial skeletons of allosaurid theropods belonging to an adult and a juvenile from the Upper Jurassic (Tithonian) Morrison Formation of McElmo Canyon in Montezuma County, southwestern Colorado, were discovered in 1953 by the late Joseph T. Gregory and David Techter. The adult specimen consists of several isolated cranial and postcranial skeletal elements that are exceptionally well-preserved and include the left premaxilla, maxilla, dentary, teeth, quadratojugal, two caudal vertebrae, pubic peduncle, ischium, proximal tibia, a nearly complete left foot, and several isolated teeth, whereas the juvenile specimen is represented by the distal portion of the right dentary and a fragmentary splenial. The specimens represent a new species of Allosaurus, here named Allosaurus lucasi, which differs from Allosaurus fragilis by having a relatively short premaxilla and robust quadratojugal with short jugal process and a short quadrate process of the quadratojugal that is at the same level as the rostral quadratojugal ramus. The presence of a new species of Allosaurus in the Tithonian of North America provides further evidence of the taxonomic and morphological diversity of the Allosauridae clade and their continuous evolutionary success, which extended to the Cretaceous.

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Dinosaur footprints from the Upper Cretaceous of Mongolia

Ishigaki S., Watabe M., Tsogtbaatar Kh., Saneyoshi M.

Geological Quarterly

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2009

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Vol. 53, No 4

449-460

EN

We report new data on 18 dinosaur footprint localities discovered in the Upper Cretaceous of the Gobi Desert of Mongolia, where we have recognized more than 20 000 footprints of dinosaurs. There are at least four types of dinosaur footprints, attributed to theropod, ornithopod, ankylosaurid and sauropod trackmakers. We have also recognized abun dant footprints of un identified trackmakers from each locality. Co existence of footprints and many skeletal remains in the same and/or nearby beds is a remarkable feature of these Mongolian sites. Analyses of dinosaur footprints and associated body fossil remains for each locality reveal that even in the same beds, the ichnofauna differ from the fauna reconstructed on the basis of body fossils of dinosaurs. The results demonstrate that dinosaur faunal assem blages reconstructed from body fossil or footprint evidence solely should be considered very carefully.

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Trop siedzącego dinozaura z wczesnojurajskich osadów Polski

Niedźwiedzki G.

Przegląd Geologiczny

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2003

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Vol. 51, nr 12

1041-1044

PL

Ślad siedzącego dinozaura został znaleziony przez G. Gierlińskiego na płycie piaskowca z wczesnojurajskiego stanowiska z tropami dinozaurów w Glinianym Lesie koło Mniowa (Góry Świętokrzyskie). Odciski zachowane są w formie naturalnych odlewów i zawierają prawy i lewy zestaw pes-manus tego samego osobnika, pozostawione w pozycji siedzącej. Odcisk pes wykazuje morfologie anomoepusową i reprezentuje dobrze znany z polskiego liasu ichnogatunek Anomoepus pienkovskii Gierliński, 1991. Tropy siedzących dinozaurów są rzadkie w zapisie paleoichnologicznym. Okaz jest pierwszym znaleziskiem tropu siedzącego dinozaura z Polski i drugim tego typu znaleziskiem z wczesnojurajskich osadów Europy.

EN

A sitting dinosaur track was found by G. GierIiński on a sandstone slab in Gliniany Las, an Lower Jurassic tracks ite near Mniów (Holy Cross Mountains, Poland). The impression preserved as natural cast, has comprised the right and leftpes-manus sets of the same individual, in sitting posture. The footprints show clearly anomoepodidmorphology and represents ichnospecies Anomoepus pienkovskii Gierliński, 1991, well known from Polish Liassic. Sitting dinosaur tracks are relatively rare in the paleoichnological record. This is the first find of sitting dinosaur track in Poland and the second find of resting dinosaur track from the Lower Jurassic of Europe.

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Późnotriasowe cmentarzysko kręgowców lądowych w Krasiejowie na Śląsku Opolskim

Dzik J., Sulej T., Kaim A., Niedźwiedzki R.

Przegląd Geologiczny

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2000

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Vol. 48, nr 3

226-235

PL

W obrębie serii ilastej „retyku” w Krasiejowie koło Ozimka zidentyfikowany został poziom, zawierający liczne czaszki i fragmenty szkieletów kontynentalnych czworonogów (głównie ziemnowodnych). Dominują wielkie labiryntodonty Metoposaurus, tekodonty (fitozaury) Paleorhinus, pancerne roślinożerne tekodonty z rodziny Aetosauridae, drapieżne labiryntodonty z nadrodziny Capitosauroidea, oraz znane tylko z pojedynczych kości najpierwotniejsze dinozaury. Bardzo rzadkie są zęby ryb dwudysznych Ceratodus i łuski ryb ganoidowych. Szczątkom kręgowców towarzyszą liczne małże słodkowodne z grupy unionidów, a w próbkach mikropaleontologicznych w wielkiej obfitości występują ramienice, wskazujące na słodkowodne środowisko sedymentacji. Jest to typowy zespół fauny Paleorhinus, o niemal globalnym rozprzestrzenieniu ograniczonym czasowo do środkowej i późnej części karniku. Paleontologiczne datowanie warstw zlokalizowanych nad ostatnimi wystąpieniami gipsu oznacza konieczność rewizji stratygrafii i korelacji wiekowej tej części polskiego triasu.

EN

A new Paleorhinus/auna has been discovered in a grey claystone corresponding to the subsurface Drawno beds, which are exposed in a cement plant claypit at Krasiejów near Opole in southern Poland. The vertebrate assemblage of perfectly preserved skeletons, isolated skulls, and postcranial remains is dominated with labyrinthodonts Metoposaurus di&gnosticus, the phytosaur Paleorhinus sp. being the second in number. Aetosaurs are represented by an incomplete skull, scuta and fragmentary bones. One sacral bone most probably representing an early dinosaur related to Staurikosaurus or Chindesaurus and two incomplete maxilla with teeth showing serration parallel to the cusp have also been found. The Krasiejów assemblage includes also dipnoans Ceratodus, undetermined fish scales and teeth, numerous unionid bivalves, very abundant characean gyrogonites, and ostracods. The Paleorhinus species is relatively short-snouted and may represent an earlier stage in the evolution of the lineage than fhe populations from Blasensandstein in Franconia and other known Yz\eor\ńm\s faunas. This is consistent with the presence q/Metoposaurus diagnosticus, the species originally described from the Schilfsandstein, located below the Blasensandstein. An equivalent ofSchilfsandstein is known in boreholes drilled nearby the locality and the bone-bearing horizon is about 80 m above its top, and about 20 m above the last occurrence of gypsum in the section. Lehrberg Schichten in Germany seem thus to be its lateral equivalents, both presumably representing the final event in the middle to late Carnian eustatic cycle. The Paleorhinus/a""a was apparently persistent in the area, as an incomplete skeleton has been found about 8 m below the mostfossiliferous horizon, in a calcareous intercalation within red clays comparable with the German Rote Wand.