The iridium layer, or K/T Boundary
The thin, grey claystone layer contains 1,000 times more iridium (REE) than the layers above and below, along with shocked quartz. Iridium is extremely rare on Earth, but a very common/abundant element in asteroids. This layer has been identified in 100+ places around the Earth.
This boundary marks the extinction of the non-avian dinosaurs.

" It surprises me how disinterested we are today about things like physics, space, the universe and philosophy of our existence,
our purpose, our final destination. It's a crazy world out there. Be curious. " ― Stephen Hawking
Tumblr Palaeontologists!
Stop the auction of illegally collected Mongolian dinosaur fossils.
“On May 20th, 2012 Heritage Auctions will place illegally collected fossils from Mongolia, including a scientifically important Tyrannosaurus (also known as Tarbosaurus) bataar skeleton (lot 49315), on the auction…
Signal boost!
Issues like this are such a huge deal these days, so spread this around!
My pet zebra finch bothering me at work by rudolphsteinkampf.
Heee I wish I had a pet to bother me like this!
(via mscrawleys)
After a 16-month gestation period, Kendi delivered her fourth calf Friday, May 4. The healthy male, which has not yet been named, is the ninth white rhino born at Disney’s Animal Kingdom; his mother, 13-year-old, Kendi, was the first. (via zooborns)
Postosuchus illustration by Christian Jegou | And I must add this surprisingly good Postosuchus rubber toy (I look forward for Stella’s critique).
From BBC Nature:
A cousin of modern crocodiles, Postosuchus was an archosaur - the lineage of reptiles that include the crocodiles, dinosaurs and birds. Reaching lengths of five metres, Postosuchus was the top predator during the Late Triassic in what’s now the southern USA. Since its front limbs were shorter than its hind limbs, there is debate as to whether it walked on two legs or four, but most palaeontologists favour the latter. Its stance, with the legs under the body, would have made it a faster and more efficient runner than a modern crocodile. Most Postosuchus fossils have been found in Texas’ Post quarry, hence the name.
Let me just confess my love for Postosuchus right here.
(via gastornis)
The mechanism of grasp
While looking at the little screech owl, I took a series of photographs and made this gif to illustrate the of the automatic grasping action of the talons.
The structure of bird feet is set up so that the foot automatically grasps when the ankle joint is bent.
This automatic grip allow birds to sleep while perching, and for raptors clench/grasp prey as the leg is folded on impact.
The mechanism of the foot is ingenious…. there’s no muscle in there at all.
The foot is powered entirely by a pulley system of tendons.
Two tendons that run along the back of the leg, Flexor Digitorum Longus and Flexor Hallucis Longus are responsible for the automatic grasp. The former pulls the forward facing toes, and the latter pulls on the hallux, or back toe.
I drew a schematic diagram of these two tendons here:
It’s particularly interesting in raptors.
Raptors swoop down on prey with talons/legs outstretched. The impact with the prey folds the raptor’s legs against its body, causing the talons to clench automatically, tearing into the prey. The automatic grip is strong enough to kill, and is what allows many hawk species to catch and kill other birds in midair.
The ingenuity and perfection of this mechanism is mind-blowing.
By Adrián Villar Rojas, a most fascinating environmental sculpture, a to scale blue whale situated in Ushuaia, Ukraine. The subtle addition of the tree stumps to make it look like it is already being assimilated by nature, brilliant touch.
Humanity and nature become one in these beautiful metamorphic illustrations.
“It’s easy to regard humankind as a species that exists apart from the rest of the natural world. Dwell on that idea too much, however, and it can grow into an unsettling feeling of detachment.”
“The next time you’re feeling isolated from nature, let these breathtaking illustrations, which seamlessly weave the bodies of humans with those of plants and other animals, serve as a compelling reminder that even when humanity and nature seem separated from one another, the two are, in fact, inextricably linked.”
“The pieces you see here are the work of Madrid-based artist Gabriel Moreno, who created them using an arresting combination of pen, ink and watercolor. What’s really mindblowing is how much detail Moreno manages to include in every illustration. It’s difficult to see in the pictures as they appear here, but many of his pieces are actually several square meters in area. Using finely crafted line work to depict images at such a large scale allows for a variety of aesthetic features to emerge depending on your proximity to the piece. The first two images illustrate this attention to detail particularly well.”
You’ll find more of Moreno’s work on his website and facebook page. (via io9.com)
Pit bull rescues owner by pulling her from train tracks.
Lilly, an adopted pit bull, saved her owner’s life by pulling her away from an oncoming train.




