GorgosaurusGenus of tyrannosaur dinosaurGorgosaurus ( ; lit. 'dreadful lizard') is a genus of tyrannosauridtheropoddinosaur that lived in western North America during the Late CretaceousPeriod (Campanian), between about 76.5 and 73 million years ago. Fossil remains have been found in Western Canada as well as the U.S. state of Montana. Paleontologists recognize only the type species, G. libratus, although other species have been erroneously referred to the genus.
TyrannosauridaeFamily of dinosaursTyrannosauridae (or tyrannosaurids, meaning "tyrant lizards") is a family of coelurosaurian dinosaurs that comprises two subfamilies containing up to fifteen genera, including the eponymous Tyrannosaurus. The exact number of genera is controversial, with some experts recognizing as few as three. All of these animals lived near the end of the Cretaceousperiod and their fossils have been found only in North America and Asia.
Corral de Enmedio FormationThe Corral de Enmedio Formation is a Mesozoic geologic formation in Mexico. The formation may be from the Kirtlandian land vertebrate age. It has a similar fauna to the Packard Formation. PaleofaunaThe fragmentary remains of indeterminate lepisosteids, trionychids, eusuchians, hadrosaurids, and ceratopsids are known from the Corral de Enmedio Formation. NotesUncertain or tentative taxa are in small text; crossed out taxa are discredited.Packard FormationThe Packard Formation is a Mesozoic geologic formation. The formation may be from the Kirtlandian land vertebrate age. It has a similar fauna to the Corral de Enmedio Formation.
Type speciesA type species (species typica) is the species considered to be permanently taxonomically associated with the name of a genus or subgenus, and that is used to identify it and distinguish it from others. In modern times, it is normally assigned when the genus or subgenus is first named. Any taxonomic revisions must be done in such a way that the genus or subgenus retains the type species if the genus is to keep its name.
AlbertaProvince of CanadaProvince in CanadaAlberta is a province in Canada. It is a part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, the Northwest Territories to its north, and the U.S. state of Montana to its south. Alberta and Saskatchewan are the only two landlocked provinces.
GenusGenus (; pl.: genera) is a taxonomic rank above species and below family as used in the biological classification of living and fossil organisms as well as viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. E.g. Panthera leo (lion) and Panthera onca (jaguar) are two species within the genus Panthera.
CampanianSubdivision of the Cretaceous according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionBase of Chron C33rLower boundary GSSPBottaccione, Gubbio, Italy43°21′46″N12°34′58″E / 43.3627°N 12.5828°E / 43.3627; 12.5828Lower GSSP ratifiedOctober 2022Upper boundary definitionMean of 12 biostratigraphic criteriaUpper boundary GSSPGrande Carrière quarry, Landes, France43°40′46″N1°06′48″W / 43.6795°N 1.1133°W / 43.6795; -1.1133Upper GSSP ratifiedFebruary 2001The Campanian is the fifth of six ages of the Late Cretaceousepoch on the geologic timescale of the International Commission on Stratigraphy (ICS).
MexicoCountry in North AmericaMexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, bordering the United States of America to the north and Guatemala and Belize to the southeast, while having maritime boundaries with the Pacific Ocean to the west, the Caribbean Sea to the southeast, and the Gulf of Mexico to the east.
MaastrichtianSubdivision of the Cretaceous according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionMean of 12 biostratigraphic criteriaLower boundary GSSP, Landes, France43°40′46″N1°06′48″W / 43.6795°N 1.1133°W / 43.6795; -1.1133Lower GSSP ratifiedFebruary 2001Upper boundary definitionIridium enriched layer associated with a major meteorite impact and subsequent K-Pg extinction event.Upper boundary GSSPEl Kef Section, El Kef, Tunisia36°09′13″N8°38′55″E / 36.1537°N 8.6486°E / 36.1537; 8.6486Upper GSSP ratified1991The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (uppermost stage) of the Late CretaceousEpoch or Upper CretaceousSeries, the CretaceousPeriod or System, and of the MesozoicEra or Erathem.
Late CretaceousSubdivision of the Cretaceous according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyChronostratigraphic nameUpper CretaceousGeochronological nameLate CretaceousName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEpochStratigraphic unitSeriesTime span formalityFormalLower boundary definitionFAD of the Planktonic ForaminiferRotalipora globotruncanoidesLower boundary GSSPMont Risoux, Hautes-Alpes, France44°23′33″N5°30′43″E / 44.3925°N 5.5119°E / 44.3925; 5.5119Lower GSSP ratified2002Upper boundary definitionIridium enriched layer associated with a major meteorite impact and subsequent K-Pg extinction eventUpper boundary GSSPEl Kef Section, El Kef, Tunisia36°09′13″N8°38′55″E / 36.1537°N 8.6486°E / 36.1537; 8.6486Upper GSSP ratified1991The Late Cretaceous (100.5–66 Ma) is the more recent of two epochs into which the CretaceousPeriod is divided in the geologic time scale.Million years agoMillion years ago, abbreviated as Mya, Myr (megayear), or Ma (megaannum), is a unit of time equal to 1,000,000 years (i.e. 1×106 years).*As an Amazon Associate I earn from qualifying purchases.