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New Dactyl
Posted: Thu Jun 24, 2010 12:15 pm
by Digit
http://www.telegraph.co.uk/science/dino ... frica.html
Well at least they think this one could fly! Progress at last.
Roy.
Re: New Dactyl
Posted: Thu Jun 24, 2010 2:43 pm
by Minimalist
Ibrahim said: ''It's amazing to think that millions of years ago the Sahara was in fact a lush green tropical paradise, home to giant dinosaurs and crocodiles and nothing like the dusty desert we see today.
Yup. Millions of years can do that!
Re: New Dactyl
Posted: Fri Jun 25, 2010 11:36 pm
by Rokcet Scientist
Minimalist wrote:Ibrahim said: ''It's amazing to think that millions of years ago the Sahara was in fact a lush green tropical paradise, home to giant dinosaurs and crocodiles and nothing like the dusty desert we see today.
Yup. Millions of years can do that!
In fact the Sahara was lush and green up until 6,000 or 7,000 years ago...
Re: New Dactyl
Posted: Sun Jun 27, 2010 1:32 pm
by dannan14
RS, the Sahara has been in flux for much longer than that. 6 or 7kya is just the most recent pluvial period for the Sahara.
Re: New Dactyl
Posted: Mon Jun 28, 2010 5:32 am
by Rokcet Scientist
In fact the Sahara was lush and green up until 6,000 or 7,000 years ago...
dannan14 wrote:RS, the Sahara has been in flux for much longer than that.
No, dannan, the Sahara hasn't been green since.
Re: New Dactyl
Posted: Mon Jun 28, 2010 3:16 pm
by dannan14
RS, you must've misread my reply. i agreed with you that the last time the Sahara was green was 6 or 7kya, but it wasn't green for millions of years straight up until 6kya.
Re: New Dactyl
Posted: Wed Jun 30, 2010 7:46 pm
by Rokcet Scientist
dannan14 wrote:RS, you must've misread my reply. i agreed with you that the last time the Sahara was green was 6 or 7kya, but it wasn't green for millions of years straight up until 6kya.
Are you saying the Sahara was only green for one or two millennia in the past X million years?
Re: New Dactyl
Posted: Thu Jul 01, 2010 11:57 am
by dannan14
No, i'm saying the amount of rainfall in the Sahara has been oscillating for many millennia. When it gets wet, people and other animals move in. As it dries out, they get pushed to the periphery again. Check out Brian Fagan's "The Long Summer: How Climate Changed Civilization". Lots of great stuff in there and an interesting read.