Precambrian

formation of Earth, 4.5 billion years ago till the evolution of hard-shelled animals, about 500 million years ago, is called the Precambrian period. There are many events during this time that are specific and affect the Precambrian life. The earth was formed and the first tectonic plate arose and began to move which caused many variations on the earth conditions during Precambrian that affected atmospheric composition and oceans. The level of oxygen arose in the atmosphere which enabled the enrichment

The Earth is 4.5 billion years old. The Precambrian period lasted for 4 billion years. In this era, organic compounds came to earth and formed the first life of single-cell organisms. These single cell organisms evolved into bigger cells and also developed to have a sex. The oxygen levels on earth began to change which leads us into the Cambrian period. The Cambrian period lasted 53 million years and consisted of mostly shallow oceans covering the continents. Skeletons grew in life forms and new

outside force. They say that the rapid appearance of diverse life cannot be predicted by traditional evolutionary theory. They claim that there are no fossilized forms from the Precambrian period. They go on to say that there are three main arguments that evolutionists pose for the paucity of fossil evidence from the Precambrian: “1. There were evolutionary ancestors before the Cambrian Explosion,

defined unit of time is the Precambrian division. This geological stretch of time is known as the first Supereon that comprises Earth’s history which lasted from the initial formation of the planet (about 4.6 billion years ago) to the phenomenal beginnings of the Cambrian period (dated at about 542 million years ago). This long stretch of time involved the transformation of the earth from a barren planet to one full of life. Three eons collectively comprise the Precambrian. These include the Hadean

the two geologists credited to their discovery. These small annelid worms ranged between one and three inches in length and had small horseshoe shaped heads. These worms resemble the modern Tomopteridae, which have heads similar to those of the Precambrian fauna, only wider. It now appears as though these marine worms are direct descendants from the ancient forms.The Ediacaran organisms are a clear foreshadowing of one of the most dramatic events in all of life's history-the rapid expansion of shell-bearing

that Death Valley and the surrounding mountains Panamint, Black, and Cottonwood were actually all stacked on top of each other and the separation lead to the present valley. Precambrian: Death Valley Dawn - 1.8 billion to 570 million years ago The oldest rocks found in the Death Valley region were formed in the Precambrian time period no more than 1.8 billion years ago during the latter half of the Proterozoic Eon. The rocks are seen on the steep face of the Black Mountains above the current area

accepted divisions of our earths are the eon, era, period, epoch, and age, the two highest levels are the Phanerozoic and Precambrian. The Phanerozoic are made of three types of era, they are, Cenozoic, Mesozoic, and Paleozoic. The Precambrian is only made up of three era, they are, Hadean, Archean, and Proterozoic. The first one that came first to start the earth was the Precambrian. The Hadean Eon was names from the mythological Hades. This part of the Geologic time was when there was no earth and

of rock. The first layer, Precambrian Canadian Shield rocks, is composed of mainly igneous and metamorphic rocks from the Precambrian Eon. This layer is the eldest at approximately 3-0.8x109 years old and is therefore the bottom-most layer (L). Although this layer is largely found in the Canadian Shield region of Ontario, glacial erratics from the Precambrian layer can be found at the Don Valley Brickyard (L). In the GTA, younger sediments and rocks cover the Precambrian rock layer (L). The second

Introduction Currently residing in the state of Vermont the bioregion to which I’ve been informally assigned to is commonly known as the Laurentia bioregion. This assignment of bioregion is widely accepted, but when looked at more deeply assigning Vermont to the Laurentia bioregion becomes problematic. There are seemingly, an endless number of variables that contribute to the characteristics and difference that vary from bioregion to bioregion. Geologic makeup, weather variance, soil type, biologic

Earth’s time has been divided up into different eras which are, Precambrian 4.6 billion-544 million years ago, Paleozoic 544-245 million years ago, Mesozoic, 245-66 million years ago, and Cenozoic 66 million years ago- present day. In each of these eras, many organisms were created, and evolved. In Precambrian, bacteria were the main living organism. But the Precambrian also includes the seapen and the jellyfish. In the Paleozoic era, also known as the age of ocean