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It marked the end of the Cretaceous period, and with it the Mesozoic era, while heralding the beginning of the current era, the Cenozoic. In the geologic record, the K–Pg event is marked by a thin layer of sediment called the K–Pg boundary or K–T boundary, which can be found throughout the world in marine and terrestrial rocks.
A study aiming to quantify the habitat of latest Cretaceous North American dinosaurs, based on data from fossil occurrences and climatic and environmental modelling, and evaluating its implications for inferring whether dinosaur diversity was in decline prior to the Cretaceous–Paleogene extinction event, was published by Chiarenza et al ...
The Ca-Al-rich inclusions, which formed 2 million years before the chondrules, [1] are a key signature of a supernova explosion. c. 4,567 ±3 Ma – Rapid collapse of hydrogen molecular cloud , forming a third-generation Population I star , the Sun , in a region of the Galactic Habitable Zone (GHZ), about 25,000 light years from the center of ...
Dinosaur bones weren’t exactly new discoveries, but the explanations were. Many of the same bones that Buckland imagined as belonging to a megalosaurus had been found in the 17th century ...
Ankylosaurus was the largest-known ankylosaurine dinosaur and possibly the largest ankylosaurid. [12] In 2004 Carpenter estimated that the individual with the largest-known skull (specimen CMN 8880), which is 64.5 cm (2 ft 1.4 in) long and 74.5 cm (2 ft 5.3 in) wide, was about 6.25 m (20 ft 6 in) long and had a hip height of about 1.7 m (5 ft 7 ...
Based on fossils from 1,000 dinosaur species and paleoclimate information, the new study looked at the spread of dinosaurs across different environments on Earth throughout the dinosaur era, which ...
Thyreophora ("shield bearers", often known simply as "armored dinosaurs") is a group of armored ornithischian dinosaurs that lived from the Early Jurassic until the end of the Cretaceous. Thyreophorans are characterized by the presence of body armor lined up in longitudinal rows along the body.
“For over 100 million years when dinosaurs were the dominant predators, mammals were generally small, nocturnal, and short-lived.” The pressure to stay alive eliminated the genes needed for ...