Ichnology and Sedimentology of a Mud-Dominated Deltaic Coast: Upper Cretaceous Alderson Member (Lea Park Fm), Western Canada

2008 ◽  
Vol 78 (12) ◽  
pp. 803-824 ◽  
Author(s):  
J. Hovikoski ◽  
R. Lemiski ◽  
M. Gingras ◽  
G. Pemberton ◽  
J. A. MacEachern
2020 ◽  
Vol 57 (4) ◽  
pp. 542-552 ◽  
Author(s):  
Ramon S. Nagesan ◽  
James A. Campbell ◽  
Jason D. Pardo ◽  
Kendra I. Lennie ◽  
Matthew J. Vavrek ◽  
...  

Western North America preserves iconic dinosaur faunas from the Upper Jurassic and Upper Cretaceous, but this record is interrupted by an approximately 20 Myr gap with essentially no terrestrial vertebrate fossil localities. This poorly sampled interval is nonetheless important because it is thought to include a possible mass extinction, the origin of orogenic controls on dinosaur spatial distribution, and the origin of important Upper Cretaceous dinosaur taxa. Therefore, dinosaur-bearing rocks from this interval are of particular interest to vertebrate palaeontologists. In this study, we report on one such locality from Highwood Pass, Alberta. This locality has yielded a multitaxic assemblage, with the most diagnostic material identified so far including ankylosaurian osteoderms and a turtle plastron element. The fossil horizon lies within the upper part of the Pocaterra Creek Member of the Cadomin Formation (Blairmore Group). The fossils are assigned as Berriasian (earliest Cretaceous) in age, based on previous palynomorph analyses of the Pocaterra Creek Member and underlying and overlying strata. The fossils lie within numerous cross-bedded sandstone beds separated by pebble lenses. These sediments are indicative of a relatively high-energy depositional environment, and the distribution of these fossils over multiple beds indicates that they accumulated over multiple events, possibly flash floods. The fossils exhibit a range of surface weathering, having intact to heavily weathered cortices. The presence of definitive dinosaur material from near the Jurassic–Cretaceous boundary of Alberta establishes the oldest record of dinosaur body fossils in western Canada and provides a unique opportunity to study the Early Cretaceous dinosaur faunas of western North America.


1957 ◽  
Vol 35 (3) ◽  
pp. 349-375 ◽  
Author(s):  
Glenn E. Rouse

A new system of nomenclature is proposed with the purpose of presenting a scheme which will be applicable to spores, pollens, and other microfossils from all geological ages. A review of previous nomenclatural systems is presented to indicate the historical development of microfossil nomenclature. The applicability of the new system is illustrated by naming 21 new species and four new genera of Upper Cretaceous microfossils from the Comox formation of Vancouver Island and the Oldman formation of southern Alberta. The microfossil conspecti are briefly compared with the assemblage previously reported from the Brazeau formation of western Alberta. Advantages of the new nomenclatural scheme are discussed in the light of future discoveries of plant microfossils, and their application to palaeobotanical and geological problems.


2020 ◽  
Vol 39 (1) ◽  
pp. 184-218
Author(s):  
BRIGID E. CHRISTISON ◽  
DARREN H. TANKE ◽  
JORDAN C. MALLON

The early collecting history of dinosaurs and other fossil vertebrates in Western Canada during the 1870s and 1880s is poorly documented. Initial finds were made by the British North American Boundary Commission and the Geological Survey of Canada in modern Saskatchewan and Alberta but, beyond a few well-publicized examples, little is known about precisely what was found and where. Much of the collected material is now housed in the collections of the Canadian Museum of Nature in Gatineau, Quebec, and a recent survey of these historic finds allows for the first comprehensive narrative regarding their identity and procurement. The collection is heavily biased towards vertebral centra and phalanges, reflective of both taphonomic and collecting biases. Given current understanding of Upper Cretaceous assemblages of North America, ornithomimids and small theropods are overrepresented, whereas ceratopsids and ankylosaurs are underrepresented. Fossils from the Belly River Group are best represented, after repeated visits to the areas of present-day Dinosaur Provincial Park and Ross Coulee near Irvine, Alberta. Taxonomic identification of the material has yielded numerous first Canadian occurrences, in addition to some first global occurrences. The latter include the first ever occurrences of Caenagnathidae (1884) and Thescelosauridae (1889). The Upper Cretaceous fossil record of Western Canada is among the richest in the world, and has been thoroughly studied over the last century. These fossils have informed our understanding of dinosaur behaviour, taphonomy, ecology, diversity dynamics, and extinction, among other aspects. But, like the animals themselves, the story of Canada's dinosaur-hunting legacy had humble beginnings—a story that has not been fully revealed before now.


1999 ◽  
Vol 36 (5) ◽  
pp. 725-741 ◽  
Author(s):  
D R Braman ◽  
A R Sweet

Three cored test holes were drilled to study the stratigraphic interval spanning the Cretaceous-Tertiary boundary: one in the western Cypress Hills near Elkwater, Alberta; a second in the eastern portion of the Wood Mountain area near Killdeer, Saskatchewan; and a third on the western edge of Turtle Mountain near Goodlands, Manitoba. The terrestrial elements of the palynological assemblages are discussed. The Maastrichtian assemblages encompassed the Scollardia trapaformis Zone and two new subzones, Myrtipites scabratus - Aquilapollenites delicatus var. collaris and Porosipollis porosus - Aquilapollenites notabile within the Wodehouseia spinata Zone. The Paleocene zones encountered include the Aquilapollenites reticulatus Subzone of the W. spinata Zone, the previously described Wodehouseia fimbriata and Momipites wyomingensis zones, and the newly defined Tricolporopollenites kruschii Zone. These provide a biostratigraphy for the cored intervals which can be related to polarity chrons. The observations made demonstrate that existing zonations are not applicable basin wide, as there are chronologically distinct disconformity-bounded sequences in western and eastern basin sectors. Apparent diachronisms within the preserved assemblages were documented by earlier entry levels within the Momipites lineage and a significant upwards extention in the range of W. fimbriata in the eastern part of the basin.


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