Cretaceous

1. Short summary of the history At 145 ± 4 to 66 million years (Ma) ago, Cretaceous period was the last period of the Mesozoic Era, right after Jurassic period and followed by the Paleogene period of the Cenozoic Era (International Commission Chart, 2014). 'Creta' in Latin means chalk and this is due to the large amount of calcium carbonate deposited by shells of marine animals thus resulting in large quantities of chalk (American Geological Institute, 1972). The shifting of continents as the result of the separation of the world-continent Pangaea continued on in the Cretaceous period that led to evolution of life on land and creation of new coastlines as well as an increase in the floras and faunas with the evolution of forest (Waggoner,…

another, without the other they could not occur. If the extinction of the dinosaurs was gradually over millions of years “both process probably played a role”(DinoBuzz). Most scientists do agree that an asteroid was a factor, it’s also acknowledged thaDinosaurs roamed the earth for 163 million years.(Dinosaur Worlds). They thrived as one of the most successful groups of animals in the history of life on land(PBS). Then, 66 million years ago, the last group of dinosaurs disappeared forever;…

Over the course of the Earth’s history there have been five Mass Extinctions, a global event where at least 75% of the life on Earth dies. In most of these events the only life form to survive are bacteria, or other small organisms that can hide from the destructive force that wipes out everything else. The Cretaceous-Tertiary (K/T) is the most recent and most famous Mass Extinction, taking place 65 million years ago. The K/T is the event in which the dinosaurs died in. The cause of this event…

Hypothesis (VBH) was re-examined after these scientists had the opportunity to review histology data for sauropod cervical ribs, discovering that there were collagen fibers attached in a length-wise fashion. They recognized that these tissues closely resemble the tissue structures found in ossified tendons and this different fiber structure would allow for a sauropod neck to have greater flexibility because the fibrous forces act parallel to the length, not perpendicular to it as the VBH…

youngest, Triassic Period, the Jurassic Period, and the Cretaceous Period.…

everything needs food, but the Giganotosaurus has a diet like no other. According to Joseph Castro, the Giganotosaurus preyed on massive herbivorous sauropods.It is also thought that the Giganotosaurus hunted in packs to take down creatures like the Argentinosaurus,the largest sauropod known(Castro). While these beast would hunt the Argentinosaurus what would be hunting them, nothing, the Giganotosaurus had no natural predators,this means it’s population could grow (Castro). Another interesting…

The Mesozoic Era was a point in time about 252 to about 66 million years ago. During this era, there were three periods. The Triassic period, The Jurassic Period, and The Cretaceous period were all very significant in earth’s evolution. Not just in animals, but in land, plants, climate, and even insects. The Triassic period was the first period of the Mesozoic era and occurred between 251 and 200 million years ago. At this time the earth was very bare. The planet was recovering from an event…

The triceratops was a large, four-legged, plant-eating ceratopsian dinosaur that had a frill of bone at the back of its skull and three distinguished horns on its face. … Triceratops were the most common kind in western North America and Canada. These dinosaurs were one of the last dinosaurs to roam the Western Interior. They lived in the late Cretaceous period, around 145.5 - 65.5 million years ago. Fossils of this species are most commonly recovered in the uppermost Cretaceous deposits of…

Kootenai Formation consists of Gastropod Limestone, Upper Clastic, Middle Limestone and Lower Clastic. Gastropod limestone is typically dark gray or white when exposed, and the new rocks are in either gray color or sparkly crystals, indicating the calcium carbonate. The grains of the carbonate stones vary from fine to sand-sized. This member of the Kootenai formation preserves fossils such as gastropods that date back to the late Cretaceous period. Gastropod Fossil is from the mollusk class, and…

Could you imagine a 40 foot, 8 ton animal on the planet? Your answer is as good as mine. No. But almost 100 million years ago this animal, Giganotosaurus, also known as "giant southern lizard" existed. The Giganotosaurus, lived in the Cretaceous period about 95-100 million years ago. It was notorious during its era. The Giganotosaurus tended to stalk their prey before they killed. They were meat eaters (carnivores). Even though their teeth were long and knife like, their jaws were not strong…