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Cambrian

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The Cambrian time period (named for Cambria - the Latin name for Wales) was the first time period in the Palaeozoic era - the first time period when life existed on the planet. It lasted on average from 541 MYA to 490 MYA. Nothing yet had lived on land at this time, but in the ocean, it was a different story. Life had already been evolving for millions of years at a slow and steady pace. The seas were full of simply, soft-bodied creatures blindly drifting in the currents. Though, in the coastal shallows below, evolution had stepped onto the accelerator. Predators had taken their first bite. The Cambrian is a major division of the geologic timescale that begins about 542 ± 1.0 Ma (million years ago). Cambria is the Latin name for Wales, where crucial specimens were found. The Cambrian is the earliest period in whose rocks are found numerous large, distinctly fossilizable multicellular organisms that are more complex than sponges or medusoids. This sudden appearance of hard body fossils is referred to as the Cambrian explosion. The Cambrian is a geologic period and system that began about 542 ± 0.3 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 ± 1.7 Ma with the beginning of the Ordovician period. It is the first period of the Paleozoic era of the Phanerozoic eon. The Cambrian takes its name from Cambria, the classical name for Wales, the area where rocks from this time period were first studied. Image:Mantell's Iguanodon restoration.jpg This article is a . You can help My English Wiki by expanding it. The Cambrian is a major division of the geologic timescale that begins about 542 ± 1.0 (million years ago) at the end of the Proterozoic eon and ended about 488.3 ± 1.7 Ma with the beginning of the Ordovician period (ICS, 2004). It is the first period of the Paleozoic era of the Phanerozoic eon. This immense vessel is the Polaris counterpart to the Leviathan. Plying its way through hyperspace via massive Etheric Wave hyper-engines (mounted as part of its bio-organic skin in its nose and tail), the Cambrian transfers huge amounts of raw materials for the construction of new worlds and the upkeep of old ones. These ships are usually assigned to a particular caste for a period of twenty years or so before rotation, but these timetables are quite flexible, and reflect the Polaran distaste for inefficient bureaucracy.

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The Cambrian is a geologic period and system that began about 542 ± 0.3 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 ± 1.7 Ma with the beginning of the Ordovician period. It is the first period of the Paleozoic era of the Phanerozoic eon. The Cambrian takes its name from Cambria, the classical name for Wales, the area where rocks from this time period were first studied. The Cambrian is the earliest period in whose rocks are found numerous large, distinctly fossilizable multicellular organisms. This sudden appearance of hard body fossils is referred to as the Cambrian explosion. Despite the long recognition of its distinction from younger Ordovician rocks and older Precambrian rocks it was not until 1994 that this time period was internationally ratified. The base of the Cambrian is defined on a complex assemblage of trace fossils known as the Trichophycus pedum assemblage. This assemblage is distinct from anything in the Precambrian as it has ecologically tiered vertical burrows which are absent from the Precambrian. Image:Mantell's Iguanodon restoration.jpg This article is a . You can help My English Wiki by expanding it. This immense vessel is the Polaris counterpart to the Leviathan. Plying its way through hyperspace via massive Etheric Wave hyper-engines (mounted as part of its bio-organic skin in its nose and tail), the Cambrian transfers huge amounts of raw materials for the construction of new worlds and the upkeep of old ones. These ships are usually assigned to a particular caste for a period of twenty years or so before rotation, but these timetables are quite flexible, and reflect the Polaran distaste for inefficient bureaucracy. The Cambrian time period (named for Cambria - the Latin name for Wales) was the first time period in the Palaeozoic era - the first time period when life existed on the planet. It lasted on average from 541 MYA to 490 MYA. Nothing yet had lived on land at this time, but in the ocean, it was a different story. Life had already been evolving for millions of years at a slow and steady pace. The seas were full of simply, soft-bodied creatures blindly drifting in the currents. Though, in the coastal shallows below, evolution had stepped onto the accelerator. Predators had taken their first bite. The Cambrian period was marked by the rise of the sea levels on the planet in the first part of the period, followed by its fall in the second half. By the end of the period, the seas dominated in the northern hemisphere of the planet, the continent of Gondwana - in the south. The Cambrian period is marked by the appearance of the first creatures with a backbone, but the majority of its animals were the invertebrates: the trilobites, the anomalocarids, etc. When the Cambrian period ended, the Ordovician time period began. The Cambrian is a major division of the geologic timescale that begins about 542 ± 1.0 Ma (million years ago). Cambria is the Latin name for Wales, where crucial specimens were found. The Cambrian is the earliest period in whose rocks are found numerous large, distinctly fossilizable multicellular organisms that are more complex than sponges or medusoids. This sudden appearance of hard body fossils is referred to as the Cambrian explosion. The Cambrian is a major division of the geologic timescale that begins about 542 ± 1.0 (million years ago) at the end of the Proterozoic eon and ended about 488.3 ± 1.7 Ma with the beginning of the Ordovician period (ICS, 2004). It is the first period of the Paleozoic era of the Phanerozoic eon. The Cambrian is the earliest period in whose rocks are found numerous large, distinctly fossilizable multicellular organisms that are more complex than sponges or medusoids. During this time, roughly fifty separate major groups of organisms or "phyla" (a phylum defines the basic body plan of some group of modern or extinct animals) emerged suddenly, in most cases without evident precursors (Gould, 1989). This radiation of animal phyla is referred to as the Cambrian explosion.

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