Cretaceous

Decent Essays
Improved Essays
Superior Essays
Great Essays
Brilliant Essays
    Page 1 of 17 - About 163 Essays
  • Improved Essays

    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,…

    • 1943 Words
    • 8 Pages
    Improved Essays
  • Improved Essays

    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;…

    • 1220 Words
    • 5 Pages
    Improved Essays
  • Improved Essays

    The Cretaceous-Tertiary

    • 424 Words
    • 2 Pages

    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…

    • 424 Words
    • 2 Pages
    Improved Essays
  • Great Essays

    Sauropod Neck Structure

    • 1452 Words
    • 6 Pages

    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…

    • 1452 Words
    • 6 Pages
    Great Essays
  • Great Essays

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

    • 1944 Words
    • 8 Pages
    Great Essays
  • Improved Essays

    Giganotosaurus Essay

    • 375 Words
    • 2 Pages

    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…

    • 375 Words
    • 2 Pages
    Improved Essays
  • Superior Essays

    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…

    • 911 Words
    • 4 Pages
    Superior Essays
  • Improved Essays

    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…

    • 449 Words
    • 2 Pages
    Improved Essays
  • Improved Essays

    Dinosaurs, a dominating specie living in the Earth long time ago, extinct mysteriously. Paleontologists and scientists have established a variety of possible theories to explain. However, all these theories are still debatable.There are four main possible explanations: Asteroid Impact, Volcano Eruption, Falling Tide and Asteroid Impact theory was established by Luis Alvarez in 1980.Many plants and animals were disappeared abruptly from the fossil record as one moves from layers of rocks…

    • 570 Words
    • 3 Pages
    Improved Essays
  • Improved Essays

    Kotenai Formation

    • 1380 Words
    • 6 Pages

    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…

    • 1380 Words
    • 6 Pages
    Improved Essays
  • Previous
    Page 1 2 3 4 5 6 7 8 9 17