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Essay / Research Paper Abstract
This page paper looks at the evolution of the acritarch as evidenced by the fossil record and seeks to explain the sudden changes that took place over a period of fifteen million years during the Neoproterozoic, which long lasting implications into the Cambrian period. The bibliography cites 6 sources.
Page Count:
4 pages (~225 words per page)
File: TS14_TEacritar.rtf
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Unformatted sample text from the term paper:
able to create a record of those changes. One life form that has undergone significant change in the part are acritarchs. The change is recoded as starting in the Proterozoid
or Pre-Cambrian and into the Cambrian (Moczydlowska, 1991) However, the initial increased rate of evolution appears to take place in the Neoproterozoic, the changes are accepted as being due to
environmental factors, however as there are several to consider the role of radiation is not an automatic choice (Moczydlowska, 1991) but does appear to be a likely factor (Grey n.d).
The Neoproterozoic period was roughly 600 million years before the current time, to 344 million years before the current time. However, as with most of these definition the boundaries
are flexible and there is a cross over with the previous and later eras and as such the definitions may vary. This period is the final segment of the
Proterozoid or Pre-Cambrian. During the Neoproterozoic there were two glacial periods, these were the Sturtian and the Marinoan, with the Varanger taking place in the northern hemisphere (Grey n.d.). The
Marinoan glaciation was extensive in Australia (Grey n.d). This is relevant as there are often changes in the evolutionary patterns of organisms when there are major environment changes, such
as changing sea levels, tectonic movements, glacial events and climatic changes (Moczydlowska, 1991). During the Cambrian period there are major climatic changes, and these are assumed to be the
causes of both geo and bio events at this time, as the changes occur rapidly in a very short period (Moczydlowska, 1991). However, looking at the fossil record the acritarchs
indicate change prior to this and there is controversy regarding what has caused the changes. In Australia there is a very clear and extensive record of the Proterozoic acritarch.
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