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amerikestrel wrote:In a book I got out of my school library, it says that the largest unit of time on the geologic time scale is the era. That contradicts what the wiki, wikipedia, and several others sites say. What is the correct answer to that?

I believe it is the eon, not the era.

Also, the same book says that the Precambrian is either a era or a period (I can't remember which), but according to wikipedia it's a supereon.

I checked the internet, and the general consensus seems to be that it is just called "Precambrian time" and is divided into the Hadean, Archean, and Proterozoic eons. But sometimes, it is called the Precambrian eon.

AlphaTauri wrote:I checked the internet, and the general consensus seems to be that it is just called "Precambrian time" and is divided into the Hadean, Archean, and Proterozoic eons. But sometimes, it is called the Precambrian eon.

Then what about supereon? Because a lot of websites (wikipedia included) say that the Precambrian is the only supereon, which is divided into the smaller eons.

And this place calls it an era.

umm...i just noticed this, but on the list it says "Genus- Spetastraea" under phylum cnidaria. Is it supposed to be "Genus- Septastrea" or am i just confused...?

it is most definitely septastraea, and has been used as such in competition. at most, the names are interchangeable, if not, stick with septastraea.

amerikestrel wrote:

AlphaTauri wrote:I checked the internet, and the general consensus seems to be that it is just called "Precambrian time" and is divided into the Hadean, Archean, and Proterozoic eons. But sometimes, it is called the Precambrian eon.

Then what about supereon? Because a lot of websites (wikipedia included) say that the Precambrian is the only supereon, which is divided into the smaller eons.

Wikipedia implies that eventually "the Precambrian eon/supereon" will be replaced with the Hadean, Archean, and Proterozoic eons. I'm not sure what this will mean answer-wise at competition, but I think that right now, it's considered a supereon since the other terms haven't become that widely accepted yet.

And this place calls it an era.

It's definitely not an era. The website actually contradicts itself- the diagram calls the Precambrian an eon and the text says that the Precambrian is divided into three different eras, therefore it can't be an era.

soobsession wrote:umm...i just noticed this, but on the list it says "Genus- Spetastraea" under phylum cnidaria. Is it supposed to be "Genus- Septastrea" or am i just confused...?

I doesn't say spetastraea, it says septastraea. But septastraea and septastrea probably are interchangeable, with the former used more commonly. Is there a way to submit a rules clarification for something on the list, just in case?

soobsession wrote:umm...i just noticed this, but on the list it says "Genus- Spetastraea" under phylum cnidaria. Is it supposed to be "Genus- Septastrea" or am i just confused...?

I bet they are interchangeable.

I am new to this event this year..
Any pointers?

AlphaTauri wrote:

amerikestrel wrote:

AlphaTauri wrote:I checked the internet, and the general consensus seems to be that it is just called "Precambrian time" and is divided into the Hadean, Archean, and Proterozoic eons. But sometimes, it is called the Precambrian eon.

Then what about supereon? Because a lot of websites (wikipedia included) say that the Precambrian is the only supereon, which is divided into the smaller eons.

Wikipedia implies that eventually "the Precambrian eon/supereon" will be replaced with the Hadean, Archean, and Proterozoic eons. I'm not sure what this will mean answer-wise at competition, but I think that right now, it's considered a supereon since the other terms haven't become that widely accepted yet.

And this place calls it an era.

It's definitely not an era. The website actually contradicts itself- the diagram calls the Precambrian an eon and the text says that the Precambrian is divided into three different eras, therefore it can't be an era.

Stratigraphic units are not completely standardized, but use this, it is the closest thing to standard as you will ever find.
http://www.stratigraphy.org/upload/ISChart2009.pdf

Hang on... is there any difference between permineralization and petrification? If there is, what is it?

The main difference is just in usage, petrification is more often in reference to wood.