By P.J. Currie, W. Langston, D.H. Tanke

ISBN-10: 0660198193

ISBN-13: 9780660198194

Within the first monographic therapy of a horned (ceratopsid) dinosaur in nearly a century, this enormous quantity offers one of many closest appears to be like on the anatomy, relationships, development and edition, habit, ecology and different organic elements of a unmarried dinosaur species. The study, which was once carried out over twenty years, was once attainable as a result of the discovery of a densely packed bone mattress close to Grande Prairie, Alberta. The locality has produced plentiful continues to be of a brand new species of horned dinosaur (ceratopsian), and components of a minimum of 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily regarding Pachyrhinosaurus canadensis, that is recognized from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many ameliorations within the decorative spikes and bumps at the cranium. The adults of either species have enormous bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. although, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes striking adjustments in the course of progress and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles remodel into bosses; spikes and horns strengthen at the best of and in the back of the frill that extends again over the neck. No reason has been made up our minds for the plain catastrophic dying of the herd of Pachyrhinosaurus from the Grande Prairie region, however it has been prompt that such herds can have been migratory animals. as well as the most descriptive paper, the amount comprises details at the distribution of bones in the bone mattress itself, and a state of the art electronic remedy of CT-scan facts of the fossils to bare the anatomy of the animal's mind.

Show description

Read or Download A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta PDF

Best paleontology books

Download e-book for kindle: Hadrosaurs (Life of the Past) by

Hadrosaurs―also often called duck-billed dinosaurs―are ample within the fossil checklist. With their specified complicated jaws and enamel ideally fitted to shred and bite vegetation, they flourished in the world in amazing range through the past due Cretaceous. So ubiquitous are their is still that we've got discovered extra approximately dinosaurian paleobiology and paleoecology from hadrosaurs than we now have from the other crew.

Get Beasts of Eden: Walking Whales, Dawn Horses, and Other PDF

Mammals first developed at in regards to the similar time as dinosaurs, and their tale might be the extra attention-grabbing of the two--in half since it can be our personal tale. during this literate and exciting booklet, eminent naturalist David Rains Wallace brings the saga of historical mammals to a normal viewers for the 1st time.

New PDF release: Palaeobiology of Middle Paleozoic Marine Brachiopods: A Case

Fossil species seem to persist morphologically unchanged for lengthy periods of geologic time, punctuated by means of brief bursts of quick swap as defined via the Ecological Evolutionary devices (EEUs). right here, morphological edition in Paleozoic atrypide morphology on the subfamily point (Atrypinae and Variatrypinae) from the Silurian and Devonian time durations within the 3rd Paleozoic EEU (~444-359 my) have been investigated utilizing fairly new options of quantitative modeling.

The Great American Biotic Interchange: A South American - download pdf or read online

South American ecosystems suffered one of many maximum biogeographical occasions, after the institution of the Panamian land bridge, referred to as the “Great American Biotic Interchange” (GABI). This refers back to the trade, in numerous levels, of land mammals among the Americas; this occasion all started throughout the past due Miocene with the looks of the Holartic Procyonidae (Huayquerian Age) in South the USA and keeps this day.

Additional info for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta

Sample text

As in in/tlleral (A). ws. ArrDIII Ache/oltsaur/ls, EillioSOIlYIIS, and P. :s/TII . an(1 is essentially featureless larerally. The bone is traversed by several deep, narrow subparallcl radiating sulci rhat pass anrerovemraJly from inside the orbit to emerge onto rhe lateral surface (Fig. I8A), where they impart a wrinkled appearance ({) the edge of the orbit. One prominent groove continues anteriorly for mOSt of the length of each of the lacrimals (Fig. ISA). No crater-like excavation nasal as occurs in AchelousflurtfS is present on the side of the lacrimal.

Seen from above, the palpebral is roughl), triangular as in Achelo/lsollrl/S (Sam pson 1995 ), Eilliosallrus (Sarnpson 1995), .. MOl/odol/ills lowei" (Sternberg 1940) and marurc specimens of I'ig. 2 1. 105) III dorslIl (A). velllml (8), ulIll /aleral (C) I/iews. Tht! JJet/ arrow silolt'S liJe ill/leliOIl where Ihe palpebrlll. frolllill. wl/l ,'{)$/Qrbillll meet. 1. 1; Srernberg 1927). The palpebrals of a subadlllt specimen of cf. 1 ) are more rounded and elo nga te. Whereas th e dorsal s urface is relatively flat in P.

The central part of this area includes a large gomphosis (peg-and-socket joint) with the jugal (Fig. 18C). These complicated joints permitted ontogenetic enlargement of the orbit, helped distribute stresses emanating from the nasofrontal region, and restricted deformation of the side of the face and orbit. A broadly rounded notch in the anteroventral edge of the lacrimal forms the posterodorsal margin of a small antorbital fenestra, which has also been called the preorbital fossa or the intra orbital foramen.

Download PDF sample

A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta by P.J. Currie, W. Langston, D.H. Tanke

by John

Rated 4.94 of 5 – based on 5 votes