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The lower boundary of the Vendian could have a biostratigraphic substantiation as well taking into consideration the worldwide occurrence of the Pertatataka assemblage of giant acanthomorph acritarchs. 635-542 Mya) represents the time from the end of global Marinoan glaciation to the first appearance worldwide of somewhat complicated trace fossils (Treptichnus pedum (Seilacher, 1955)).Although the Ediacaran Period does contain soft-bodied fossils, it is unusual in comparison to later periods because its beginning is not defined by a change in the fossil record.By contrast, the Canary and Madeira islands off the Atlantic coast of Morocco are much closer to, and usually grouped with, Africa (the Canary Islands are only 100 km (62 mi) from the African coast at their closest point, while Madeira is 520 km (320 mi) from Africa and 1,000 km (620 mi) from Europe).The Mediterranean island nation of Malta is approximately 81 km (50 mi) from the coast of Sicily in Europe - much closer than the 288 km (179 mi) distance to the closest African coast.
All of these Mediterranean islands are actually located on the African plate, and may be considered part of the continent of Africa.The boundaries between the continents of Earth are generally a matter of geographical convention. The number of continents is most commonly considered seven but may range as low as four when the Americas and Afro-Eurasia are each considered a single continent.According to the definition of a continent in the strict sense, an island cannot be part of any continent, but by convention and in practice most major islands are associated with a continent.More than 100 genera have been described, and well known forms include Arkarua, Charnia, Dickinsonia, Ediacaria, Marywadea, Onega, Pteridinium, and Yorgia.There is evidence that Earth's first mass extinction happened during this period when early animals changed the environment.