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.
The Cambrian Period (543 to 505 million years ago) is the first time period of the Paleozoic Era.It is preceded by the Precambrian. The Cambrian Period opened in the aftermath of a mass extinction. During the last 100 million years of the Precambrian, a unique fauna had developed.y Laura Klappenbach. The Cambrian Period (543 to 505 million years ago) is the first time period of the Paleozoic Era. It is preceded by the Precambrian.