Precambrian Time Research Paper

Major Biological Event: During the beginning of the Precambrian era the first signs of life were found. They were basic, single celled organisms that use photosynthesis to make food. Later the organisms evolved into more complex species.

The Devonian period initiating approximately 416 Mya and culminating 359 Mya represents a geologic time period, which characterizes a major part of the Paleozoic Era. Traversing between the Silurian period (444 - 416 Mya), and Carboniferous period (359 – 299 Mya) the Devonian period epitomizes substantial modifications in the world's ecology and geography.

During the Pre-Cambrian era specifically the Proterozoic periods’ there was numerous orogenic events that were crucial in shaping the Pre-Cambrian craton. The first major orogenic event in the early part of the Proterozoic was the Penokean orogeny, which is shown in the record by major deformations and some high-grade metamorphic rocks, and it also includes some igneous rocks in the form of intrusions. These were followed by andesitic volcanism over the entire region, and the appearance of granite. Next, there was some low-grade metamorphism and the appearances of plutons over the area in the Middle Proterozoic. Rocks that were involved with the Penokean orogenic event are shown in the Superior province on top of the basement rock, and they

The Cambrian Period marks the beginning of the Paleozoic Era. This period gets its name from a place in Wales where the first examples of this type of ancient life was found. The period lasted for nearly 53 million years, from about 543 million years ago until 490 million years ago. The Cambrian Period marks an important point in the history of life on earth; it is the time when most of the major groups of animals first appear in the fossil record. This event is sometimes called the "Cambrian Explosion", because of the relatively short time over which this diversity of forms appears. It was once thought that the Cambrian rocks contained the

Earth as known today is just temporally. The planet is always changing and once it was far different than it is now, it was an extreme habitat when life first appeared. The first fossil confirming life existence dates from 3.5 billion years ago [8]. However, the characteristics of this fossil indicate it was an organism reasonably evolved, suggesting that life appeared much prior in time. Even at present days is still hard to determine when the first life form appeared on Earth, since rocks older than approximately 3.5 Ga have been

The Precambrian boundary today remains a highly controversial topic despite the continuous research and pressures being put on understanding the early Cambrian evolution. Radioactive dating has seen a dramatic advancement as well as continuous progress in chemo-, bio-, and magneto- stratigraphy. Laminated stromatolites prevail in the Precambrian fossil date as well as a completely new perception on ancient life being understood due to the sequence of the chronostratigraphic period. Biosedimentary structures which occur and form by the permineralisation of unicellular organisms are an indicator of the Precambrian-Cambrian boundary, and are found outside a dated period. This has created a completely different understanding and view of fossils

I have decided you should visit the Neogene time period. In order to access this period in history, set your clock to the Phanerozoic Eon and the Cenozoic Era. This time period is split into two epochs: Pliocene and Miocene. The Neogene period began 23 million years ago and ended about 1.8 million years ago. This time period is approximately 21.2 million years long.

The Bronze Age is a time period where by the use of bronze, proto-writing, and other early features of urban civilization is characterized. Smelting own copper and arsenic are said to define an ancient civilization in the Bronze Age. (Bronze Age, Retrieved from: http://www.writeopinions.com/bronze-age). The term "prehistory" covers the time since the beginning of the Universe, but is more focused on the beginning of life in Earth or even more specifically to the time since human-like beings appeared. (Retrived from:

The beginning of the Cambrian Explosion is normally thought to have occurred about 542 million years ago, during the Cambrian Period at the start of the Palaeozoic Era. This ‘explosion’ happened over millions of years although it is described as rapid in geological terms. In this period of time, the Earth saw the rapid appearance of a wide variety of animals. Ecosystems became much more complex in the Cambrian Period to those that were seen in Ediacaran Period. As the variety and number of new organisms increased, they started to occupy new marine habitats and environments. Cambrian seas saw many animals of different shapes and sizes; some lived on the sea floor while others swam in the water.

The Paleolithic Age is also known as the stone age. This is the era where stone tools were most used and the most useful for helping perform daily tasks. The stone tools were first used 2.5 to 2000 years ago. Life has changed drastically since the Paleolithic Age with the discovery of new materials and a new way of doing things. I thought that the Paleolithic Age was not important because stone tools didn't seem as important to modern tools today. I have now learned that the stone tools help start civilization.

In determining the age of our world many geologist have set out to find the details that remain consistent throughout the world. What has been found is that you can closely determine the age of the world based upon the layers that have been formed throughout the varying periods of time. The article “The Grand Age of Rocks” walks us through the two main areas of dating I.e. “Relative Dating” and “Absolute Dating”. These two differences are important to understand as we seek to identify just how long the earth has been around.

5. The Cenozoic Era began about 65 million years ago and continues into the present, is the third documented era in the history of Earth. The current locations of the continents, inhabitants, including humans, existing today can be traced back to this period. The Cenozoic Era is divided into three periods. Paleogene Period (65-23 million years ago), which consists of the Paleocene, Eocene and Oligocene epochs); Neogene Period (23-2.6 million years ago), which includes the Miocene and Pliocene epochs); Quaternary Period (2.6 million years ago to the present), consisting the Pleistocene and Holocene epochs).

Jurassic is a period of time with Dinosaurs, rodents and birds. There were also island seas consisting of sharks, sea monsters and blood-red planktons. The existing plants in that period were cycads, ferns and conifers. The Mesozoic era was about 245 million years ago to 65 years ago, so it almost lasted about 180 years in total. The Mesozoic era is divided into three periods of Triassic, Jurassic and Cretaceous. Mesozoic era means middle animals and it is the era, which the word’s fauna has changed from what is in the Paleozoic era and the most famous organisms of this era are dinosaurs. In the Mesozoic era, the extinction of more than 90 percent of species in the earth was observed and the reason behind it was mostly volcanic eruptions and climate changes. On the other hand, this era had massive changes that represented ecological niches and rise to new creatures such as rodent-size mammals and first dinosaurs. In Triassic, which was the first period of Mesozoic, the mammals and first dinosaurs existed. Later than that, the second period was Jurassic, which giant shaped dinosaurs and other kinds of dinosaurs were developed. Besides that the first flowering plants and primitive birds, with long teeth appeared in that era as well.

When we think of history, we think of important people, places, cultures, events, and much more. The backbone of history rests on its chronology. It gives us the "when" of basic analysis. It gives us a frame of reference, the order of things. Before having an "absolute" way of determining dates, history was based in guesses and assumptions. Many attempts were made to organize the dates of the past. Some of these attempts were made by geologist. Geologist used the idea of "stratigraphic succession" (Renfrew, 1973) which is based on the "principle that when successive layers or strata are observed in position, the underlying ones are the earliest." (Pg. 23 Renfrew, 1973) By setting the layers in

ANSWER: Prehistory is the era before people could write. It is the time and events that happened before the history has written down and led to the development of something. [ ] Others defined prehistory as from the creation of the universe, while some refer to it as time since the development of life on earth. But others mainly define prehistory as the period of time beginning with the appearance of human beings. Basically, prehistoric period is the era when the existence of human beings began. [ ]