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I've already added this to the Phanerozoic article, and I'm thinking that I should add it here as well. If you have anything you want to change, either change it directly, or tell me on my talk page. I'd appreciate your input! I'll be adding it tomorrow, but you're still free to edit it further (but if you're going to delete, please tell me why)... Dunkleosteus77 (talk) 03:09, 5 May 2015 (UTC)
Since this is a copy of the Phanerozoic article as it stood a few days ago, I have taken the liberty of putting it in a collapsible box so people can find the discussion. RockMagnetist(talk) 03:40, 7 May 2015 (UTC)
Thank you for your offer. You are welcome to add some material, but you should bear in mind a few things:
We have a lot of material on the Phanerozoic already, so you'll need to be careful how you blend the new stuff in.
Aside from the largest time divisions, this article is organized by theme, not period, and it would be best to stick to that organization. You might want to look at Geological history of Earth, which is organized more like Phanerozoic.
This article is a failed Good Article nominee, but it has been much improved since then, so you need to maintain the high standards. In particular, bare urls for citations will not do. I see that someone has cleaned up your citations in Phanerozoic.
I don't know how those bear URL's got in there, but I've added the original copy from my sandbox which (to my knowledge) has no bare URL's. If you wish to edit that section, please do, and then tell me what you did because I'd like to keep my sandbox copy up-to-date. If you wish to delete it, please tell me why (and it better be a good reason...) Dunkleosteus77 (talk) 01:49, 8 May 2015 (UTC)
Remember my points about thematic organization and blending the material in? Please don't just paste it in. You need to read the existing material and see where (and if) your material fits. Much of your text duplicates existing material. RockMagnetist(talk) 02:04, 8 May 2015 (UTC)
I guess I could add the Cenozoic section because the existing one is lacking in information. I don't really know if I can merge the rest though, but I'd appreciate it if anyone could find a spot for it in this article. I also added it to the Mesozoic, but if you want to delete that one, I'd understand. Dunkleosteus77 (talk) 02:17, 8 May 2015 (UTC)
I didn't add the entire "Mesozoic" section, just the Triassic, Jurassic and Cretaceous subsections. You deleted too much and someone's going to have to re-write it... Dunkleosteus77 (talk) 01:46, 9 May 2015 (UTC)
I've re-written the section titled "Diversification of Mammals". Before I add it (in about a week or so), tell me what you think. Dunkleosteus77 (talk) 02:38, 9 May 2015 (UTC)
One last comment here, then I'll move on to diversification of mammals. If you look at the edit summaries, you'll see that I did some work after deleting your material. Some years ago, I pointed out that the organization of the article was inconsistent, with most sections being organized thematically but the Phanerozoic being organized by era. There was some support for changing this, but I never got around to doing it. Now I have done it. RockMagnetist(talk) 02:54, 9 May 2015 (UTC)
Actually, another comment. Would you mind if we deleted the copy of Phanerozoic? We can always look at the article, and the copy puts a large table of contents at the top of this discussion. RockMagnetist(talk) 02:58, 9 May 2015 (UTC)
The first true mammals evolved in the shadow of the giant reptiles that filled the world during the mid-Mesozoic. Probably the first mammals were nocturnal to escape predation, and rather small. Mammals only began to diversify after the K-T extinction event when the world was left empty of anything over 10 kilograms. The early Eocene was when earth recovered from the extinction, but mammals were still quite small and living in the shadow of the dinosaurs' descendants: birds. Birds, like Gastornis, ruled the earth, and forced some mammals to evolve to escape predation. Creatures like Ambulocetus took to the oceans to eventually evolve into whales , whereas some creatures, like primates, took to the trees . This all changed during the mid to late Eocene when the circum-Antarctic current formed between Antarctica and Australia which disrupted weather patterns on a global scale. Prairies (without grass) set out to rule much of the earth, and mammals such as Andrewsarchus rose up to become the largest mammalian predator ever  and early whales like Basilosaurus took control of the seas. The Oligocene saw the evolution of grass, and the beginnings of its conquest to rule the world's flora.
The evolution of grass brought a remarkable change to the planets landscape, and the new open spaces created pushed mammals to get bigger and bigger. Grass started to expand in the Miocene, and the Miocene is where many modern day mammals. Perissodactyls like Paraceratherium and Deinotherium (rhinos and elephants) evolved to rule the grasslands. The evolution of grass also brought primates down from the trees, and started the human branch. The first big cats evolved during this time as well, and will eventually branchiate into lions and other large felids . Major tectonic events were occurring alongside these events. The Tethys Sea was closed off by the collision of Africa and Europe , and the Isthmus of Panama form between North and South America.
The formation of Panama was perhaps the most important geological event to occur in the last 60 million years. Atlantic and Pacific current were closed off from each other, which caused the formation of the Gulf Stream, which made Europe warmer (winters wouldn't get colder than 10 degrees Celsius). The land bridge allowed the isolated creatures of South America to migrate over to North America, and vise versa . The ancestors of bears, cats, dogs, horses, llamas, and raccoons all migrated across, which is why we have the Spectacled Bear, the Puma (in both of the Americas), and the Llama (which evolved in North America).
Three million years from today was the Pleistocene epoch, probably one of the most famous epochs in geological history. This epoch featured a roller coaster of climactic changes due to the ice ages. The ice ages led to the evolution of modern man in Saharan Africa (which formed due to the Ice Ages) and expansion. The mega-fauna that dominated fed on grasslands that, by now, had taken over much of the subtropical world. The large amounts of water held in the ice allowed for various bodies of water to shrink and sometimes disappear such as the North Sea and the Bering Strait. It is believed by many that a huge migration took place along Beringia which is why, today, there are camels (which evolved and went extinct in North America), Horses (which evolved and went extinct in North America), and Native Americans. The ending of the last ice age coincided with the expansion of man, along with a massive die out of ice age mega-fauna. This extinction, nicknamed "the Sixth Extinction", has been going ever since. In present day, mammals have come a long way from shrews living in the shadows of the Mesozoic forests.
Good choice of subject. It's the part of the existing article that is most in need of help. I think that, with a little cleanup, it would be quite a suitable addition. I'll try to get to it soon. RockMagnetist(talk) 03:00, 9 May 2015 (UTC)
Should I work on a Mesozoic version, or would that be too much? Dunkleosteus77 (talk) 14:06, 9 May 2015 (UTC)
Not much point in that, since the Mesozoic no longer has its own section. RockMagnetist(talk) 23:51, 9 May 2015 (UTC)
Should we re-add the section because that's a fairly important time in earth's history (involving life)? Dunkleosteus77 (talk) 00:20, 10 May 2015 (UTC)
Please read the previous section again. As I mentioned there, that is not the way the rest of the article is organized, and there was a discussion some time ago in favor of using the same organization for the Phanerozoic. I do describe the time divisions at the top of History of Earth#Phanerozoic. RockMagnetist(talk) 14:26, 10 May 2015 (UTC)
The first two paragraphs of this section; the writing in the collapsible box Dunkleosteus77 (talk) 23:11, 12 May 2015 (UTC)
It does need significant revision to look more encyclopedic, but it is still an improvement over the existing material in that section, so I'd be o.k. with your adding it. RockMagnetist(talk) 02:48, 13 May 2015 (UTC)
Should this article be reorganized by geological divisions?
I don't know if you've noticed, but everything talking about geological time (which makes up over half of the articles info) is not organized thematically, but rather chronologically. When speaking in terms of geological time, it is natural to order them chronologically, which is why I strongly suggest reorganizing the rest of the article chronologically rather than thematically. Dunkleosteus77 (talk) 17:20, 11 May 2015 (UTC)
By "chronologically" you mean by geological time units. Of course, it is divided into eons. I have some reasons for preferring this organization:
There is no single right or wrong approach. This article is intermediate between Geological history of Earth, which organizes time by epoch, and Evolutionary history of life, which is entirely thematic. It seems to me that when there are articles with overlapping contents, it is good to vary the presentation.
Since we're trying to cover all of Earth's history, we need to paint with a very broad brush. The article size is already 52kb of readable prose size, with some sections still needing expansion (see the size guideline). I think it is easier to be concise if we keep the time divisions large.
This is the way the article has developed, and we have been working section by section to raise it to a Good Article level (see the to-do list at the top of this page for progress so far). You're still relatively new to Wikipedia, so I don't think you realize how much work this involves. A major reorganization would set this effort back.
I have provided a separate section heading for this discussion. RockMagnetist(talk) 19:13, 11 May 2015 (UTC)