Scioly.org

I've always though of petrification as a subset of permineralization.

Better explaination...
"Permineralized fossils have their original pore space infilled with minerals. Permineralization is commonly confused with petrification, in which the original material of an organism is replaced with minerals, and the pore space is infilled with minerals. In other words, petrification is a combination of permineralization and replacement."

Im gettin really annoyed with google right now....

So a lot of sites say that the Precambrian super eon began 4500 BILLION years ago. Then others say it began 4500 MILLION years ago.

Im confused...

Also, is the Hadean Eon Before 3800 MYA or 3800 BILLION YEARS AGO.

Lol so annoying.

lllazar wrote:Im gettin really annoyed with google right now....

So a lot of sites say that the Precambrian super eon began 4500 BILLION years ago. Then others say it began 4500 MILLION years ago.

Im confused...

Also, is the Hadean Eon Before 3800 MYA or 3800 BILLION YEARS AGO.

Lol so annoying.

The Hadean eon is the first eon contained within the Precambrian supereon. They both began at the same time, the time of the Earth's formation. Estimates may vary slightly, but a good number is 4600MYA, which is equivalent to 4.6 billion years ago. I prefer saying 4.6 billion years ago and writing 4600MYA. If you say 4600 million years ago, you sound British.

The Hadean eon ENDED 3800MYA or 3.8 billion years ago (same thing).

Also, depending on estimates of Hubble's constant, the age of the universe is estimated to be between 13.5 and 14 billion years old. Nothing (at least nothing scientific) is thousands of billions (aka trillions) of years old.

FYI the universe is only 14 billion years old so that will automatically rule out one of those numbers.

rfscoach wrote:FYI the universe is only 14 billion years old so that will automatically rule out one of those numbers.

And the Earth is only 4.5 billion years old anyway.

Sigh, im having a lot of trouble with finding info on fossils from the list, can anyone help me out?

Any sites or books?

BTW wat do we have to know about the fossils? Taxonomic hierarchy? Modes of Preservation?

Also, do we have to learn ALL dinosaurs or just the ones on the list?

lllazar wrote:Sigh, im having a lot of trouble with finding info on fossils from the list, can anyone help me out?

Any sites or books?

BTW wat do we have to know about the fossils? Taxonomic hierarchy? Modes of Preservation?

Also, do we have to learn ALL dinosaurs or just the ones on the list?

I too was wondering if anyone had any really good books on fossils that they found helpful. I don't mean like a field guide but more like a real informational book with detailed explanations. It would be great if people could share their finds and suggest some books!

Could anyone help me with 'n' on the event list (Adaptations and morphologic features of major fossils groups)? Other than the example they gave, I have no idea what else to look up.

gneissisnice wrote:]
And the Earth is only 4.5 billion years old anyway.

Yup, only 4.5 billion years old.

katzmeow wrote:Could anyone help me with 'n' on the event list (Adaptations and morphologic features of major fossils groups)? Other than the example they gave, I have no idea what else to look up.

For this topic, you just need to know how organisms adapted to survive. You probably don't need to get too specific, hence the inclusion of "major fossil groups".