Sturtian glaciation

The stubbornness or obstinacy Tables Tables Ice Age glaciation was widespread, potentially global ice age or a phase with several ice ages in the geological age of Cryogeniums. She was one of at least three major glaciations in the Neoproterozoic era. Evidence of this ice age were provided, among other things based on the tillite rock from the eponymous South Australian Sturt Valley. Also glacial deposits from other parts of the world, including northern Australia ( Kimberley region ), northwestern Canada ( Ogilvie Mountains, Mackenzie Mountains and Victoria Island ), Namibia ( Otavi Group), South China ( Yangtze craton ) and Oman ( Huqf group) are assigned to the stubbornness tables ice age type.

Geology

Information on the exact time of stubborn ice age tables vary greatly and are dependent on the used method of determination and the examination site. They range from about 760 million years ago to about 640 million years ago. Due to the large time differences and the existence of several stubbornness Phonetic ice ages is discussed. Current regulations require that a stubbornness tables ice age is said to have occurred before about 715 million years ago and lasted for at least five million years.

The extent of stubbornness tables ice age is the subject of scientific debate. After the Snowball Earth hypothesis, it led to an almost complete freezing of the entire Earth. As a reminder, among others, the South Australian rocks of glacial origin of Precambrian age, their paleomagnetism suggesting a deposition in the vicinity of the equator apply. According to other theories, the glacial sediments that are to be attributed to several local glaciations without a global glaciation.

Flora and Fauna

The stubbornness Tables Ice Age had a significant impact on the development of life on Earth. Before the Ice Age stubbornness tables differentiation of eukaryotic life forms began. Micro -and macro- fossils prove the existence of Amoebozoen, Rhizarien, red algae, green algae and Chromalveolaten. With the beginning of the stubbornness tables ice age a numerically dramatic decline of life on earth is recorded. For the period from the beginning of the stubbornness tables ice age until the end of Cryogeniums only isolated microfossils come. The time between the stubbornness tables and the subsequent Marinoischen Ice Age is predicted based on genetic studies, as the date of the first appearance of multicellular animals ( Metazoa ). Molecular evidence from this period indicate the occurrence of the first sponges.