What is the Cambrian period?
The Cambrian period is a geological period that extends 542 to 488 million years ago. For many decades, it has been known for being considered the first geological period to contain multicellular life. Since 1967, however, scientists have determined that multicellular life has existed before the Cambrian period (in the Ediacaran period), although most of it was quite simple and non -motivated, consisting of leaves and bags with a significant quilted look. But the Cambrian era was the first to contain a truly complex life - including the precursors of the most modern animal. On the other hand, there are only a few representatives of modern phyles in Ediacaran. Small fauna and shella trilobites are among the earliest hard animals in a vfoster record, and for centuries the well -known fossils of multicellular animals have been first known. Archaeocyathids ("ancient cups") are another feature of the beginning of Cambrian, probable mushrooms that resemble corals. Archaeocyathids were the first cliff builders on the planet and prospered for about 23 million years until withE got a steep decline 520 million years ago.
As the Cambrian period progressed, many amazing fossils appeared. So many fascinating new organisms appear in such an evolutionary short time (10-15 million years) that the period has been dubbed "Cambrian explosion". There is Marella , the odd trilobite member; five eyes Opabina , with claw on a stem protruding from the head; "Slig Slig" wiwaxia , whose phylum is unknown; Early echidnoderms; tribal groups; Spiny-limbed kerygmachela with its long ceremony; earlyjawless fish myllocunmingia , which is the earliest known vertebral or years; Velvet worms mushroom; Hyolites, mysterious animals of conical shell; Monoplacorans, simple disposable molluscs; Brachiopods, stationary persecuted animals, which are superficially similar to the bings; and the "King of the Jungle" of the Cambrian period, huge (for his time - wasone meter long) "Strange Shrimp" anomalocaris with his huge eyes and dual feeding on his head. Before this point, the life of animals was quite boring and simple.
Cambrian is characterized by the fact that he had a unique class Faun, sometimes called "trilobite fauna" that never dominated the Earth at any time. In the Ordovice period, immediately afterwards, new animals appeared, including more advanced molluscs such as puzzles that swept the old order. The animals also grew; While most of the animals in Cambria were no greater than a few centimeters, long leg and longer ones became much more common in Ordovik and the following periods.
Another thing known to Cambrian's period is the first known trace fossils of animals that go to the ground- curly and climatichnites, Chevron shaped traces up to 6 inches in diameter produced either by large arthropod or servant organism. These animals probably did not spend much time on the ground butPerhaps for a moment the coast moved through wet sands to clean up the particles of food that would otherwise remain unaffected.