Hey,
please look at the IR question posted here:
https://www.beatthegmat.com/graphics-in ... 09048.html
According to the solution in GMATPrep, the _beginning_ of the Cambrian Period marks the onset of a new era, eon and period.
While it is obvious that it marks the onset of a new period, it isn't clear to me why it should also mark the onset of a new eon and era. According to the provided graphic, its _end_ marks the onset of a new era and eon, but its beginning still lies within another era and eon.
Any thoughts?
Thank you,
Kevin
IR Question from GMATPrep
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- Junior | Next Rank: 30 Posts
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Hi All,
I am also curious about this question as I came to the same conclusion as Kevinst.
The answer I selected was Precambrian eon as it marks the end of the Paleozoic era which I equate with the start of another (unnamed?) era. It also marks the beginning of the of the Vendian period.
Any thoughts on this would be greatly appreciated!
I am also curious about this question as I came to the same conclusion as Kevinst.
The answer I selected was Precambrian eon as it marks the end of the Paleozoic era which I equate with the start of another (unnamed?) era. It also marks the beginning of the of the Vendian period.
Any thoughts on this would be greatly appreciated!
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- Junior | Next Rank: 30 Posts
- Posts: 11
- Joined: Sun Jul 29, 2012 1:37 pm
- Location: Los Angeles, CA
Hi All,
I just redid the problem and realize the reason the answer is the Cambrian period is because the timeline shows how far in the past each eon/era/period is. Therefore, what looked like the "end" of the Cambrian period is actually the beginning of the period that started ~550 years ago.
I guess I should've taken the hint that the PREcambrian era came before the cambrian period.
Hope this helps!
I just redid the problem and realize the reason the answer is the Cambrian period is because the timeline shows how far in the past each eon/era/period is. Therefore, what looked like the "end" of the Cambrian period is actually the beginning of the period that started ~550 years ago.
I guess I should've taken the hint that the PREcambrian era came before the cambrian period.
Hope this helps!