Archeozoic era essay

Extinction of American megafauna such as the mammoth and sabretooth cat Smilodonas well as the end of Clovis culture - 12, yrs ago: Sea level rises by 91 meters ft Holocene Epoch 11, years ago to today - Development of agriculture - 9, yrs ago: Metal smelting started - 5, yrs ago: Invention of the wheel - 5, yrs ago:

Archeozoic era essay

June 19, Alena Hovorkova The Paleozoic Era, which ran from about million years ago to million years ago, was a time of great change on Earth.

Proterozoic Eon | geochronology |

The era began with the breakup of one supercontinent and the formation of another. And the first vertebrate animals colonized land. Life in the Paleozoic The Paleozoic began with the Cambrian Period53 million years best known for ushering in an explosion of life on Earth.

Archeozoic era essay

This "Cambrian explosion" included the evolution of arthropods ancestors of today's insects and crustaceans and chordates animals with rudimentary spinal cords. In the Paleozoic Era, life flourished in the seas.

After the Cambrian Period came the million-year Ordovician Period, which is marked in the fossil record by an abundance of marine invertebrates. Perhaps the most famous of these invertebrates was the trilobitean armored arthropod that scuttled around the seafloor for about million years before going extinct.

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After the Ordovician Period came the Silurian Period million years ago to million years agowhich saw the spread of jawless Archeozoic era essay throughout the seas. Mollusks and corals also thrived in the oceans, but the big news was what was happening on land: This was the time Archeozoic era essay plants evolved, though they most likely did not yet have leaves or the vascular tissue that allows modern plants to siphon up water and nutrients.

Those developments would appear in the Devonian Period, the next geological period of the Paleozoic. Ferns appeared, as did the first trees. At the same time, the first vertebrates were colonizing the land.

These vertebrates were called tetrapodsand they were widely diverse: Their appearance ranged from lizardlike to snakelike, and their size ranged from 4 inches 10 cm long to 16 feet 5 meters long, according to a study released in in the Journal of Anatomy. As the tetrapods took over, they had company: The Devonian Period saw the rise of the first land-living arthropods, including the earliest ancestors of spiders.

The skeleton of Eryops, one of the earliest land-walking tetrapods. Janis Paleozoic evolution Life continued its march in the late Paleozoic. The Carboniferous Period, which lasted from about million years ago to million years ago, answered the question, "Which came first — the chicken or the egg?

Long before birds evolved, tetrapods began laying eggs on land for the first time during this period, allowing them to break away from an amphibious lifestyle. Trilobites were fading as fish became more diverse. The ancestors of conifers appeared, and dragonflies ruled the skies.

Tetrapods were becoming more specialized, and two new groups of animals evolved. The first were marine reptiles, including lizards and snakes. The second were the archosaurs, which would give rise to crocodiles, dinosaurs and birds.

Most creepily, this era is sometimes referred to as the "Age of the Cockroaches," because roaches' ancient ancestor Archimylacris eggintoni was found all across the globe during the Carboniferous.

The last period of the Paleozoic was the Permian Period, which began million years ago and wrapped up million years ago. This period would end with the largest mass extinction ever: Before the Permian mass extinction, though, the warm seas teemed with life.

Coral reefs flourished, providing shelter for fish and shelled creatures, such as nautiloids and ammonoids. Modern conifers and ginkgo trees evolved on land.

Terrestrial vertebrates evolved to become herbivores, taking advantage of the new plant life that had colonized the land.

Archean Eon | Atmosphere, Timeline, and Facts |

Paleozoic geology and climate All this evolution took place against the backdrop of shifting continents and a changing climate. During the Cambrian Period of the Paleozoic, the continents underwent a change. They had been joined as one supercontinent, Rodinia, but during the Cambrian Period, Rodinia fragmented into Gondwana consisting of what would eventually become the modern continents of the Southern Hemisphere and smaller continents made up of bits and pieces of the land that would eventually make up today's northern continents.

The Cambrian was warm worldwide, but would be followed by an ice age in the Ordovician, which caused glaciers to form, sending sea levels downward. Gondwana moved further south during the Ordovician, while the smaller continents started to move closer together.

In the Silurian Period, the land masses that would become North America, central and northern Europe, and western Europe moved even closer together. Sea levels rose again, creating shallow inland seas. In the Devonian, the northern land masses continued merging, and they finally joined together into the supercontinent Euramerica.

Gondwana still existed, but the rest of the planet was ocean. By the last period of the Paleozoic, the Permian, Euramerica and Gondwana became one, forming perhaps the most famous supercontinent of them all:The Who: Quadrophenia Tour One November 1, The Who reunited on tour to perform their rock opera, Quadrophenia.

Quadrophenia was released in , so almost 40 years later they are showing it again. I first heard of the tour in mid-summer and got my tickets soon after.

Hadean Eon

Phanerozoic Eon: Phanerozoic Eon, the span of geologic time extending about million years from the end of the Proterozoic Eon (which began about billion years ago) to the present.

The Phanerozoic, the eon of visible life, is divided into three major spans of time largely on the basis of characteristic. The Phanerozoic Eon. The Phanerozoic Eon is a period of geological history that spans million years and is typically subdivided into three eras.

These eras are: Paleozoic Era: to Read this essay on Rocks of Connecticut. Come browse our large digital warehouse of free sample essays. Get the knowledge you need in order to pass your classes and more.

Archeozoic era essay

Only at". Archeozoic Era The Archeozoic Era stretches from about billion to billion years ago. Traditionally, the beginning of the Archean is defined to coincide with the oldest rocks discovered. The Archean, also known as Archeozoic is a geologic eon (The largest defined unit of time is the supereon, composed of are divided into eras, which are in turn divided into periods, epochs and ages) before the Paleoproterozoic (first of the three sub-divisions (eras) of the Proterozoic occurring between 1, to 2, million years ago) Era of the Proterozoic (a geological eon.

Geological Timeline: Precambrian to Present Day. Major Earth Events and Fossil Extinctions.