There are many parts of the railway business which are interesting in their own right and which questions are asked about from time to time. This page looks at detailed parts of equipment, systems, standards, dimensions, procedures and infrastructure in no particular order. New items will be added from time to time.
The Ediacaran Period ( /iËdiËÃ¦kÉrÉn/), spans 94 million years from the end of the Cryogenian Period 635 million years ago (Mya), to the beginning of the Cambrian Period 541 Mya. It marks the end of the Proterozoic Eon, and the beginning of the Phanerozoic Eon. It is named after the Ediacara Hills of South Australia.
For example, coelacanth fish exist in the fossil record for what are thought to have been 400 million years. Then they suddenly disappear from the fossil record some 80 million years ago only to reappear alive an well swimming around in oceans today.nts 40 million years older than previously thought (Link). Animal fossils associated with the Ediacaran Period (635 to 543 million years ago) have been found in sediments that date squarely in the Proterozoic Eon, 1.6 billion years ago-a billion years older than previously thought (Link).