of times. These extinction events were largely the result of dramatic changes in their environment. About 435 million years ago, the supercontinent, Pangaea, was beginning to form, and the current of the world’s oceans was being altered by drifting land masses. Sea levels and ocean temperatures dropped significantly due to the formation of glaciers. This led to the extinction of corals and as much as 60% of all marine life, this period is called “the Ordovician–Silurian Extinction Event.” Corals came
A Mass Extinction is when there is a rapid decreases in life and biodiversity in a short amount of time. This type of event may be caused by a natural disaster or a fast change in the environment and the animals can’t adapt to it fast enough. The mass extinction of Ordovician-Silurian occurred 445.2-443.4 Million years ago. The end period Ordrivacan and the strat Silurian period. Scientists believe the cause of the event was sea levels decreased because of glaciation; forming glaciers or covering
have hypothesized various extinction events. The following essay will cover the five major extinction events, otherwise known as the “Big 5 Mass Extinction Events”. According to Wikipedia (2016), a mass extinction is “a widespread and rapid decrease in the amount of life on Earth. Such an event is identified by a sharp change in the diversity and abundance of multicellular organisms”. The first major extinction event is said to have been the Ordovician-Silurian mass extinction, 443 million years ago
Palaeontologists characterize mass extinctions as times in Earth’s history when the Earth loses more than three-quarters of its species in a geologically short period of time. This has occurred 5 times over the past 540 million years, and scientists are now suggesting it is happening a 6th time. We are in the midst of a sixth mass extinction that has the potential to wipe out many species of importance, and humans have a profound impact on it. Essentially, there have been 5 mass extinctions during the history of
Some 480 million years ago, way before the dinosaurs, the Ordovician period, was the period when plants were finally able to inhabit land. It lasted for 42 million years. Sea levels were very high during this time, which allowed the already present sea creatures to grow to even larger proportions. During the Ordovician Age, the Earth had milder climates than before. The air in the atmosphere was warm and wet. Sea levels kept rising but leveled off in the middle of the period. At the beginning of
to change plants became widespread, and the first vertebrate animals colonized the lands. It would then show how the supercontinent divided and briefly cover each time period within the Paleozoic Era. Until the show ended with showing the ice age extinction. This will give them the background necessary for each room after which has displays for each period within the Paleozoic era. There would be
of the Cambrian period. Ordovician: • This period started 505 million years ago and ended 438 million years ago. • Many primitive plants appeared on land and some of the first corals. Primitive fish and fungi also make an appearance. High sea levels occur at fist but lower as global cooling, glaciation and volcanism increase. • Plants, fungi and primitive fish are on land during this time period. • Glaciation marked the end of the Ordovician period. Silurian: • This period started 438 million
The anthropodes also evolved in this period, and more than 600 types evolved worldwide. Ordovician Period The Ordovician Period lasted almost 45 million years. During this period, most of the area was almost entirely ocean, and most of the world's land was collected into the southern supercontinent Gondwana. Throughout the Ordovician, Gondwana was submerged underwater. This period is best known for its animals, including graptolites, trilobites, brachiopods
There have been 5 mass extinctions in Earth’s existence. The names of these are (from most recent to least recent): Cretaceous–Paleogene, Triassic–Jurassic, Permian–Triassic, Late Devonian, and Ordovician–Silurian. The most well known mass extinction, Cretaceous-Paleogene, was theorized to have occurred through a massive comet or asteroid impact. A cold winter created by the impacting object forbid any plants and plankton to carry out photosynthesis. During this time, about three quarters of all
The Cambrian period kicked off the Paleozoic era, from there came the Ordovician, Silurian, Devonian, Carboniferous periods. The Paleozoic era ended with the Permian period. Throughout each period came many new and different crustaceans. One, in particular, were trilobites. Trilobites are extinct but are closely related to horseshoe