The Canadian Journal of Earth Sciences is a monthly peer-reviewed scientific journal established in 1963, which reports current research on all aspects of the Earth sciences. It is published by NRC Research Press. The journal also publishes special issues that focus on information and studies limited in scope to a specific segment of the Earth sciences. The editor-in-chief is Ali Polat (University of Windsor). According to the Journal Citation Reports, the journal has a 2012 impact factor of 1.366.
|Canadian Journal of Earth Sciences|
|Discipline||Earth sciences, geochemistry, geology, mineralogy, petrology|
|Edited by||Ali Polat|
NRC Research Press (Canada)
|Can. J. Earth Sci.|
Albertosaurus (; meaning "Alberta lizard") is a genus of tyrannosaurid theropod dinosaurs that lived in western North America during the Late Cretaceous Period, about 70 million years ago. The type species, A. sarcophagus, was apparently restricted in range to the modern-day Canadian province of Alberta, after which the genus is named. Scientists disagree on the content of the genus, with some recognizing Gorgosaurus libratus as a second species.
As a tyrannosaurid, Albertosaurus was a bipedal predator with tiny, two-fingered hands and a massive head that had dozens of large, sharp teeth. It may have been at the top of the food chain in its local ecosystem. While Albertosaurus was large for a theropod, it was much smaller than its larger and more famous relative Tyrannosaurus rex, growing nine to ten meters long and possibly weighing less than 2 metric tons.
Since the first discovery in 1884, fossils of more than 30 individuals have been recovered, providing scientists with a more detailed knowledge of Albertosaurus anatomy than is available for most other tyrannosaurids. The discovery of 26 individuals at one site provides evidence of pack behaviour and allows studies of ontogeny and population biology, which are impossible with lesser-known dinosaurs.Allenby Formation
The Allenby formation is a sedimentary rock formation deposited during the early to early Middle Eocene. It consists of conglomerates, sandstones with interbedded with shales and coal. The coal seams contain an abundance of insect, fish and plant fossils, known from the shales since 1877 but best known from the Princeton Chert.The following fossil genera and species have been described from the Allenby formation:
Trogosus sp., Trogosus latidens
Ulmus okanaganensisBloody River (Canada)
Bloody River is a river in Nunavut and the Northwest Territories, Canada. It flows into the Dease Arm of Great Bear Lake in the Northwest Territories at approximately 66°56′01″N 120°34′07″W.An outcrop of Saline River gypsum was noted near Bloody River, 67°57′N 119°31′W (NTS 86 M)* +27.2
W. Kupsch "found tails of till-covered bedrock behind eroded rock bosses and referred to such compound landforms as crag-and-tail drumlins" west of Bloody River.Caenagnathidae
Caenagnathidae is a family of bird-like maniraptoran theropod dinosaurs from the Late Cretaceous of North America and Asia. They are a member of the Oviraptorosauria, and close relatives of the Oviraptoridae. Like other oviraptorosaurs, caenagnathids had specialized beaks, long necks, and short tails, and would have been covered in feathers. The relationships of caenagnathids were long a puzzle. The family was originally named by Charles Hazelius Sternberg in 1940 as a family of flightless birds. The discovery of skeletons of the related oviraptorids revealed that they were in fact non-avian theropods, and the discovery of more complete caenagnathid remains revealed that Chirostenotes pergracilis, originally named on the basis of a pair of hands, and "Ornithomimus" elegans, named from a foot, were caenagnathids as well.Continuoolithus
Continuoolithus is an oogenus (fossil egg genus) of dinosaur egg found in the late Campanian of Alberta and Montana. It was laid by an unknown type of theropod. These small eggs (measuring 77–123 mm (3.0–4.8 in) long) are similar to the eggs of oviraptorid dinosaurs (oofamily Elongatoolithidae), but have a distinctive type of ornamentation.
Continuoolithus nests, unlike those of Troodon and oviraptorids, would have been incubated under vegetation and sediment rather than brooding adults. Adaptations in the eggshell, such as high porosity and prominent ornamentation, would have helped the embryo breathe while buried. One fossil egg contains a tiny embryonic skeleton at an exceptionally young stage of development (perhaps eight to ten days old) showing the earliest stages of bone development.Coronosaurus
Coronosaurus is a genus of centrosaurine ceratopsian dinosaurs which lived in the Late Cretaceous, in the middle Campanian stage. Its remains, two bone beds, were discovered by Phillip J. Currie in the Oldman Formation of Alberta, Canada, and its type and only species, Coronosaurus brinkmani, was first described in 2005, as a new species within the genus Centrosaurus. Later studies questioned the presence of a direct relationship, and in 2012 it was named as a separate genus. Coronosaurus means "crowned lizard", coming from "corona", Latin for crown, and "sauros", Greek for lizard; this name refers to the unique, crown-like shape of the horns on the top of its frill.Like other ceratopsids, Coronosaurus had a large frill and horns on its head. These include a small pair of brow horns over its eyes, a large nasal horn on its snout, and, unique among ceratopsians, irregular, spiky bone masses on its frill. Growing up to around five meters long and two tonnes in weight, it was mid-sized for its kind. The genus is classified as a member of the Centrosaurini, a group of derived centrosaurines which has also been found include taxa such as Styracosaurus, Spinops, Rubeosaurus, and Centrosaurus, the genus it was originally placed within.Dinokanaga
Dinokanaga is a small genus of scorpionfly belonging to the extinct family Dinopanorpidae. The six species D. andersoni, D. dowsonae, D. hillsi, D. sternbergi, D. webbi, and D. wilsoni have all been recovered from Eocene fossil sites in British Columbia, Canada, and Washington state, USA.Dinokanaga is a combination of the Greek word deino meaning "terrible" or "monstrous" and okanaga in reference to the Okanagan highlands fossil sites where the specimens have been recovered. The type description of the genus was first published in 2005 by Dr. Bruce Archibald in the Canadian Journal of Earth Sciences. Description of the new genus was based on the study of over 20 compression fossil specimens from five fossil producing locations in the highlands. Dinokanaga and Dinopanorpa, currently the only known genera in the family Dinopanorpidae, are distinguished by a number of wing vein characters including lack of fine reticulated crossveins in Dinopanorpa, and the "Rs" vein branched 3-5 times in Dinokanaga. The fossil specimens of high preservation quality sometimes show the original color patterning, being mostly dark with light to clear areas. Within the genus wing characters are key to separating the species.Dromiceiomimus
Dromiceiomimus is a genus of ornithomimid theropod from the Late Cretaceous (early Maastrichtian) of Alberta, Canada.Geology of Newfoundland and Labrador
The geology of Newfoundland and Labrador includes basement rocks formed as part of the Grenville Province in the west and Labrador and the Avalonian microcontinent in the east. Extensive tectonic changes, metamorphism and volcanic activity have formed the region throughout Earth history.Geology of the Northwest Territories
The geology of the Northwest Territories has been mapped in different quadrangles by the Canadian government. The region has some of the oldest rocks in the world and among the oldest in North America, formed from several sections of stable craton continental crust, including the Slave Craton, Rae Craton and Hearne Craton. These rocks form the Archean and Proterozoic Precambrian basement rock of the region and are the subject of extensive research to understand continental crust and tectonic conditions on the early Earth.Glauconite
Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color with very low weathering resistance and very friable.It crystallizes with a monoclinic geometry. Its name is derived from the Greek glaucos (γλαυκος) meaning 'blue', referring to the common blue-green color of the mineral; its sheen (mica glimmer) and blue-green color presumably relating to the sea's surface. Its color ranges from olive green, black green to bluish green, and yellowish on exposed surfaces due to oxidation. In the Mohs scale it has hardness of 2. The relative specific gravity range is 2.4 - 2.95. It is normally found in dark green rounded brittle pellets, and with the dimension of a sand grain size. It can be confused with chlorite (also of green color) or with a clay mineral. Glauconite has the chemical formula – (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2.
Glauconite particles are one of the main components of greensand, glauconitic silstone and glauconitic sandstone. Glauconite has been called a marl in an old and broad sense of that word. Thus references to "greensand marl" sometimes refer specifically to glauconite. The Glauconitic Marl formation is named after it, and there is a Glauconitic Sandstone formation in the Mannville Group of Western Canada.Jack Souther
Jack Gordon Souther (April 25, 1924 – June 1, 2014) was an American-born Canadian geologist, volcanologist, professor and engineer. He contributed significantly to the early understanding of recent volcanic activity in the Canadian Cordillera. Many of his publications continue to be regarded as classics in their field, even now several decades after they were written.McAbee Fossil Beds
The McAbee Fossil Beds is a Heritage Site that protects an Eocene Epoch fossil locality east of Cache Creek, British Columbia, Canada, just north of and visible from Provincial Highway 97 / the Trans-Canada Highway (Highway 1) at 50°47.831′N 121°8.469′W. The McAbee Fossil Beds, comprising 548.23 hectares (1,354.7 acres), were officially designated a Provincial Heritage Site under British Columbia's Heritage Conservation Act on July 19, 2012. The site is part of an old lake bed which was deposited about 52 million years ago and is internationally recognised for the diversity of plant, insect, and fish fossils found there. Similar fossil beds in Eocene lake sediments, also known for their well preserved plant, insect and fish fossils, are found at Driftwood Canyon Provincial Park near Smithers in northern British Columbia, on the Horsefly River near Quesnel in central British Columbia, and at Republic in Washington, United States. The Princeton Chert fossil beds in southern British Columbia are also Eocene, but primarily preserve an aquatic plant community. A recent review of the early Eocene fossil sites from the interior of British Columbia discusses the history of paleobotanical research at McAbee, the Princeton Chert, Driftwood Canyon, and related Eocene fossil sites such as at Republic.Nain Province
In Labrador, Canada, the North Atlantic Craton is known as the Nain Province. The Nain geologic province was intruded by the Nain Plutonic Suite which divides the province into the northern Saglek block and the southern Hopedale block.Phlegethontioidea
Phlegethontioidea is a clade of aistopod amphibians including the families Phlegethontiidae and Pseudophlegethontiidae. It is a stem-based taxon defined in phylogenetic terms as all aistopods sharing a more recent common ancestor with Phlegethontia than Oestocephalus.Random Formation
The Random Formation is a near-shore rock unit dating to the early Cambrian period, dominated by tidal quartz arenites, but also incorporating intertidal and open-shelf deposits, including glauconitic and mud-cracked mudstones (now shales), and red channel sandstones. It was deposited quickly and is approximately 175 m thick. The Blue Pinion Formation was originally recognized as a separate formation, but is now interpreted as an expression of the Random Formation.Sinornithoides
Sinornithoides (meaning "Chinese bird form") is a genus of troodontid theropod dinosaurs containing the single species Sinornithoides youngi. S. youngi lived during the Early Cretaceous (Aptian/Albian stage, around 113 million years ago). It measured approximately one meter long (3.3 ft). It lived in Inner Mongolia, China, and probably ate invertebrates and other small prey.Sphaerium beckmani
Sphaerium beckmani is an extinct species of fossil freshwater pea clams from the Late Cretaceous deposits of North America. This species was first described by the American paleontologist Loris Shano Russell in 1976. The specimens were collected by the American paleontologist Karl M. Waage from 1961 to 1962 from the Hell Creek Formation of eastern Montana. The locality is dated to the late Maastrichtian Age (around 66.0 to 72.1 million years ago).Strathcona Fiord
Strathcona Fiord is a fiord on the west central coast of Ellesmere Island, the most northern island within the Canadian Arctic Archipelago, Nunavut, Canada.