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TOPIC: Dinosaurs


L

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RE: Dinosaurs
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Deep in the Petrified Forest formation on New Mexico's Ghost Ranch, a group of palaeontologists have come across the fossil remains of a surprising creature whose existence could rewrite the books on how dinosaurs came to be.
The story, as it is being rewritten, is that the first dinosaurs on Earth were relatively pint-sized animals and spent 15 million to 20 million years low in life's pecking order before they became the planet's dominant animal form. This idea runs counter to the prevailing theory that after dinosaurs first evolved, their numbers and their size exploded, quickly making them the dominant animal on Earth.
The newly discovered fossil shaking up old theories is not a dinosaur but a very close cousin, named Dromomeron romeri (dro-MO-mer-on RO-mer-eye) by those who discovered him. It belonged to an archaic group of animals called "basal dinosauromorphs," or pre-dinosaurs.

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The dinosaurs might have gone out with a sudden bang, but their rise to dominance was a gradual ascent, not a sudden takeover, a study suggests.
It shows that dinosaurs co-existed with a more primitive group of reptiles for millions of years before becoming the most common land animals on Earth.
Experts had assumed that once dinosaurs emerged, they swiftly replaced their predecessors the dinosauromorphs.
But the latest study in Science journal questions this theory.

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Juvenile sauropod
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A new fossil of a juvenile dinosaur that lived 140 million years ago is shedding light on how the ancient reptiles grew from youngsters to enormous adults.
Archaeologists unearthed the dinosaur in 1999 from the Lower Morrison Formation of the Howe Ranch in Bighorn County, Wyoming. They estimate the dinosaur was about 1 year old when it died toward the end of the Jurassic Period (206 million to 144 million years ago).

Its the only complete skeleton of a juvenile sauropod we know of -  lead researcher Daniela Schwarz of the Natural History Museum in Basel, Switzerland.

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Dragon bones
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After nearly two years of efforts, the tallest, heaviest and largest dinosaur fossil - of the Ruyang Yellow River dinosaur- has been found by geological excavators in Ruyang County, Henan Province.
Archaeologists in central China's Henan Province unearthed  the heaviest dinosaur fossils in Asia in an area where local residents kept on digging up what they called "dragon's bones" to use as traditional Chinese medicine.
The calcium-rich 'Dragon bones' were sometimes boiled with other ingredients and fed to children as a treatment for dizziness and leg cramps. Other times they were ground up and made into a paste that was applied directly to fractures and other injuries.
Scientists studied the "dragon's bones" and identified them as fossils of dinosaurs that lived between 85 to 100 million years ago in the Cretaceous period of the Mesozoic Era.
The Ruyang Yellow River Dinosaur (Huanghetitan liujiaxiaensis) measures 18 meters long and its sacrum - part of the vertebrae in the lower back - is as broad as 1.31 meters, making it broader than that of the dinosaur fossil unearthed in Gansu in 2006, which was then identified as Asia's heaviest dinosaur.
Experts from The Institute of Vertebrate Palaeontology and Paleoanthropology (IVPP) with the Chinese Academy of Sciences, believe that discovery of this dinosaur fossil not only incorrectly identified the Ruyang Basin area as being of the early Cainozoic stratum, but also has important scientific value for the study of the huge, sauropod dinosaurs' distribution, migration patterns and evolution.

Qingdaonews

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Villagers in central China dug up a ton of dinosaur bones and boiled them in soup or ground them into powder for traditional medicine, believing they were from flying dragons and had healing powers.
Until last year, the fossils were being sold in Henan province as "dragon bones" at about 4 yuan  per kilogram.
Professor Dong Zhiming , with the Institute of Vertebrate Palaeontology and Paleoanthropology of the Chinese Academy of Sciences, said when the villagers found out the bones were from dinosaurs they donated 200 kilograms  to him and his colleagues for research.

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Apatosaurus
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Down three miles of dirt road, on a farm outside Ten Sleep lay the final resting place of several dinosaurs that met their end in a mud hole 140 million years ago.
Today, palaeontologists are slowly and carefully scratching away at the dinosaur graveyard and have recently unearthed the fossilised remains of an apatosaurus, better known as brontosaurus. The specimen has been endearingly nicknamed "Einstein, the brontosaurus with a brain," because of the complete and intact braincase.
Henry Galiano, founder and owner of Maxilla & Mandible International, LLC, the company responsible for the dig site, said this is a rare and exciting find. The Ten Sleep specimen is 80 percent complete, and 70 feet in length. It has been gathered over the past two years by palaeontologists from around the world. Two from Germany are at the site now.
Generally speaking, apatosaurus skeletons more than 50 percent complete are rare, Galiano said. There exist only 10 unearthed adult skeletons and two other fragmentary skulls, making this find an "extreme rarity."

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RE: Dinosaurs
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A rare glimpse into life on Earth more than a 100 million years ago is soon to open at the Shanghai Science and Technology Museum. Ancient fossil remains of some of the greatest beasts ever to roam our planet go on display at a free exhibition from early July to late August. Some of the exhibits never have been publicly seen before.

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Eocursor parvus
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Scientists have described a new primitive dinosaur species, Eocursor parvus, which lived in the Late Triassic - about 210 million years ago.
Unearthed in South Africa's Free State, the creature appears to have been a small, agile plant-eater.
The team tells a Royal Society journal that Eocursor sheds light on the early evolution of the Ornithischia.
This important group included the well known herbivororous dinosaurs Triceratops and Stegosaurus.
The fossil specimen was first identified in 1993 but only recently appraised.

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What did dinosaurs hear? Probably a lot of low frequency sounds, like the heavy footsteps of another dinosaur, if University of Maryland professor Robert Dooling and his colleagues are right. What they likely couldn't hear were the high pitched sounds that birds make.
Yet, it was what Dooling knows about bird hearing that led him and research collaborators Otto Gleich and Geoffrey A. Manley to determine what might have been in the extinct animal's world of sound 65 million years ago. It seems that dinosaurs and their archosaur descendants, including birds and crocodiles, have very similar ear structure. By comparing those structures and applying other rules of hearing, the scientists have devised an idea of the dinosaur's hearing range.

"The best guess is that dinosaurs were probably somewhat similar to some of the very large mammals of today, such as the elephants, but with poorer high frequency hearing than most mammals of today. As a general rule, animals can hear the sounds they produce. Dinosaurs probably also could hear very well the footsteps of other dinosaurs. Elephants, for instance, are purported to be able to hear, over great distances, the very low frequency infrasound generated by the footsteps of other elephants" - Robert Dooling.

Dooling will present the team's findings at the Acoustical Society of America annual meeting, Tuesday, June 5, in Salt Lake City.

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Fossil bones from the largest dinosaurs ever known to walk Australia were on Thursday unveiled in a find, which scientists said, shed new light on the country's prehistoric past.
The remains of two Titanosaurs, nicknamed Cooper and George, were uncovered by farmers near the outback town of Eromanga in south-west Queensland state in 2005 and 2006, but were kept secret to allow investigation by dinosaur-hunting scientists.

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