Dino's First?

[us.2u]

Does anyone know; were the Dinos the first walking animals on this planet? I believe they survived about 50 million years is that right? And I'm really confused to as how long have we've been around... some say only a million years yet fossils say we've been around for about 4 million years does anyone out-there know for sure?...us.2u

[[Tycho?]]

I dont see how this is an astronomy related question.

 

And use google. It isn't hard.

[us.2u]

I thought the Earth was just another planet in space like Mars Jupiter etc.. so I presumed any planet especially Earth which we know supports life! Has everything to do with Astronomy as I believe we are just another planet orbiting in the Astrological system or have I got my facts incorrect? And Earth is nothing to do with space?...us.2u

[AzurePhoenix]

Dinosaurs first sprang up about 230 million years ago I believe. Only one species I've heard about survived for longer than one of it's three periods (Jobaria, I believe, a primitive sauropod)

 

Dinos were predated by the first known reptiles by 70 million years. Before them were amphibeans, and before them, insects, before them, scorpians, I think.

 

The oldest homo sapian fossils are between 190 and 200 thousand years old (http://www.livescience.com/humanbiology/050216_oldest_humans.html)

 

Erect hominids on the other hand, have recently been found to have existed around 3.8 million years ago (our ancestors probably, or close to um') (http://edition.cnn.com/2005/TECH/science/03/05/ethiopia.hominid.ap/)

 

I believe the typical lifespan for a specific species is between five and ten million years. I'll see if I can find a link. Jobaria may have survived ten times that, I'll have to check. It seems like dinos lived along time because there were hundreds of known species. It's like saying "mammals have been around for over three hundred million year!!" But almost never the same species for very long

[[Tycho?]]

I thought the Earth was just another planet in space like Mars Jupiter etc.. so I presumed any planet especially Earth which we know supports life! Has everything to do with Astronomy as I believe we are just another planet orbiting in the Astrological system or have I got my facts incorrect? And Earth is nothing to do with space?...us.2u

 

Yes, you have several "facts" incorrect, and your reasoning is flawed as well.

[AzurePhoenix]

Found it, scorpians predated the first herps by over 100 million years,

still lookin' for Jobaria.... okay, jobaria (the perfect sauropod) may have survived as a species as long as 50 million years, and the average species survives for nine million. Homo hasn't been around for nearly that long, so if your worried, mellow out, we still got some time. Event he shortest lived survive around a million years, in which case, we're still young adults, relishing in our twenties.

[us.2u]

Thank-you Azure-Phoenix I really appreciate the knowledge you have shared & the links are extremely 'informative' I've logged them to favourites & I feel all those 'astronomical' events which occured all those millions of years ago; just amazing! Once again Azure'Phoenix thanks for your knowledge...us.2u

[AzurePhoenix]

i feel dirty for some reason....

 

Don't tell me ----- 2u is some freako villain who will use the info I passed along to destroy the world.

[us.2u]

Well you never know Az' but what is Jobaria? & be careful of the scorpions from Jupiter...2u

[AzurePhoenix]

Jobaria, a primitive cretaceous / jurassic sauropod, i forget where from

[Ophiolite]

I believe the typical lifespan for a specific species is between five and ten million years.

I was going to post a remark about one of the more famous exceptions to this general tendency, the brachiopod Lingula. I decided to check on whether it was merely the genus that had survived 500 million years from the Cambrian, or had one or more species remained unchanged since then. Instead I found this interesting paper that rejects the notion that Lingula can be considered a 'living fossil'. One is reminded of the idea that you cannot step into the same river twice.

 

Edit: Oops. Forgot to post the link yesterday and now I am having trouble relocating it.