The Ceratopsian Dinosaurs and Associated Lower Vertebrates from the St. Mary
River Formation (Maestrichtian) at Scabby Butte, Southern Alberta

%ANN LANGSTON, JR.
Texas Memorial Museum and Department of Geological Sciences, The University of Texas at Austin,
Austin, Texas 78722
Received December 12, 1974
Revision accepted for publication April 7, 1975

Scabby Butte, a limited exposure of late Cretaceous sediments in southern Alberta, Canada, is an important source for the large ceratopsian dinosaur Pachyrhinosaurus Sternberg. New cranial material confirms this taxon's place among short-faced ceratopsids, and circumstantial evidence suggests that it possessed a spiked frill reminiscent of Styracosaurus. Postcranial bones as- sociated with Parhyrhinosaurus skulls in a bonebed deposit probably belong to the genus and indicate a massive body approaching Triceratops dimensions. Another ceratopsian„Anchi- ceratops, is sparsely represented.

All classes of gnathostomes, except birds, are represented by fragmentary material at Scabby Butte. Of 21 lower vertebrate taxa, fourteen are new to the St, Mary River Formation (Squarirhi na, Sqrtarina, Amia, Belonosromus, Parallmla, Platacodon, Opisthotriton, Boremys, Piioplatecarpus, a tyrannosaur, a coelurosaur, an ornithomimid, Troodon, Fdmontosaurus, Edmontonia).

Scabby Butte, un affleurement de sediments Cretace inferieur au sud-est de 1'Alberta, Canada, est une source importante des grands dinosauriens ceratopsiens Pachyrhinosaurus Sternberg. De nouveaux materiaux craniens confirment leur classification taxonomique en ceratopsides a peutes faces, ei deg evidences secondairee sugaerretit qu'ils poasedaient un reste-de la: co)arette den'lelee de SPjggco'srturrts., Des o's ctametis associes aux debris de Peti lrvrlnrtp'r@rrrusi dans url. di pot riche ert os., iniiquen un animal massif s.'ripprbchant des diriiengions de Tricei iirispS, Un: autre Cei atOpaieri, Arinitlpdrrriupt; eSt egalement raretn'ent reprelsente.

1 outes )es classes:ge gnathostomes, sauf les oiseatix. sont representtes par des fragments de mater)el osaeux g Squabby Butte. Des.21 taxottoriiies driiivertebt~ts inferi'ears, 14 sdnt nouve)tee 'pour la Formation St-h'fary River (Sqttnrt)h&ta, Squrttirtrr', Am'. Belr>rtrir'rdmtrs, Prrrrtlbnla., Pllitaci<akirr, r1 pisrtiorrfto~ii, Bart»r)rys. PjieptdkecNrpirx,. un tyrannosaure; ilIA coetUrosaure. url ornithomimide, Troiidon. Fdmorttosaurttsr Rdmbrtrortia) lTraduit par le jouritall

have not been dealt with in detail. The material, all of which is housed at the National Museum of Natural Sciences in Ottawa, provides addi- tional information about Pachyrhinosaurus, which is still but poorly known. And, although no new genera are recognized, eleven taxa are new to the St. Mary River Formation. This paper is a supplement to another report (Langs- ton 1975), to which the reader is referred for a review of the occurrence, history of collecting, geological matters, and detailed locality data at Scabby Butte, and a paleoecological interpre- tation of the deposit.

Introduction

Can. J. Earth Sci., 12, 1576-1608 (1975)

LANCJSTON: CERATOPSlAN 01NOSAURS

1577

Class ELASMOBRANCHII
Order Isuriformes

Orectolobidae

Squatirhina americana Estes
Order Squatinoidei

Squatlilidae

Squatina Risso, sp. indet.
Order Rajiformes

0asyatidae

Myledaphus bipartitus Cope

I.eidyosuchus Lambe, sp. indet.

Crocodilia, gen. and sp. indet.

Order Saurischia

Tyrannosauridae, gen. and sp. indet.

?Coeluridae, gen. and sp. indet.

Ornithomimidae, gen. and sp. indet,

Troodontidae

Troodon Leidy, sp. indet.

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Order Ornithischia
Hadrosauridae
Edmontosaurus Lambe, sp. indet,
Ceratopsidae
Pachyrhinosaurus canadensis Sternberg

Class OSTEICHTHYES

Order Amiiformes

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After a century of spectacular paleontological revelations in the Mesozoic fossil fields of North America, the finding of a genuinely new kind of dinosaur is a novel event. Such was the discovery of the large battering-ram ceratopsian Pachyrhi- nosaurus, reported by C. M. Sternberg in 1950. One of Sternberg's three specimens was re- covered from Upper Cretaceous rocks of the St. Mary River Formation at an isolated patch of badlands known as Scabby Butte, about 17 miles (-27 km) north-northwest of Lethbridge, Alberta. Subsequent work at Scabby Butte by L. S. Russell, R. L. Fowler, and by parties from the National Museum of Natural Sciences under my supervision have brought to light a con- siderable array of fossil vertebrates. The mam- mals have already been described by Sloan and Russell (1974), but the non-mammalian taxa

Non-Mammalian Vertebrates from Scabby
Butte
The non-mammalian vertebrates from Scabby
Butte are summarized below (for a list of the
mammals, see Sloan and Russell 1974).