dinosaurs
bioephemera | April 29, 2009
Check out Brian's new review of A History of Paleontology Illustration (Life of the Past) by Jane Davidson, in Palaeontologia Electronica:
It is rare for fossils to be featured in fine art, but in the 15th century painting A Goldsmith in His Shop, Possibly Saint Eligius by the Flemish master Petrus Christus there is, if you look carefully, a fossil shark tooth among the objects scattered on the shop's table. The fossil plays a nearly insignificant role in the painting, but it reflects the general interpretation of such natural curiosities at the time. From this modest starting point,…
edyong | March 18, 2009What happens when you find a feathered dinosaur that really isn't meant to have feathers? That's the question set by a spectacular new fossil that adds a confusing dimension to the origin of feathers.
The concept of dinosaurs with feathers is no longer surprising. Birds certainly have them and they are now considered to be living dinosaurs. The infamous Velociraptor and its relatives were covered in plumes, which ranged from the simple quills of Sinosauropteryx to the flight-capable plumes on Microraptor's four wings. We know about these prehistoric feathers through the beautiful fossil…
gregladen | March 10, 2009Dino spoor, that is. A recently reported finding in PLoS ONE clarifies a number of questions about how certain dinosaurs held their front limbs (zombie/Frankenstein-position palm-down vs. huggie-wuggie palms-facing-each-other). This research confirms ...
that early theropods, like later birds, held their palms facing medially, in contrast to ... prints previously attributed to theropods that have forward-pointing digits. Both the symmetrical resting posture and the medially-facing palms therefore evolved by the Early Jurassic, much earlier in the theropod lineage than previously recognized…
gregladen | February 4, 2009Or, more accurately, did these dinosaurs either engage in intraspecific combat (such as territorial or mating contests among males) or fight predators such as Tyrannosaurs, like in the movies?
Well, one thing we know for sure: If any folklore, belief, or 'fact' related to a fossil species sits around long enough, eventually someone will come along and study it. This usually involves reformulating the idea as one or more testable hypotheses, then attacking the hypotheses ... much like Tyrannosaurus might or might not have attacked Triceratops, to see if it can be killed, or alternatively,…
edyong | January 27, 2009Thanks to its trinity of horns, Triceratops has become of the most recognisable of dinosaurs. The sight of two bulls charging at each other and jousting with their horns must have been an incredible one - geeky palaeontologists might get a small thrill just thinking about it. But did it ever really happen? Did Triceratops ever use its unmistakeable horns in combat, or were they simply for show?
Both theories have been put forward, but Andrew Farke from the Raymond M. Alf Museum of Palaeontology (who blogs at the Open Source Palaeontologist) thinks that both were probably right. By looking at…
edyong | January 12, 2009Beipaiosaurus was among the strangest of dinosaurs. It looked like a fusion of body parts taken from several other species and united in the unlikeliest of proportions. It had a stocky body, long arms adorned with massive claws, a long neck topped by an incongruously small head, and a beaked mouth. Bizarre as this cocktail of features is, it's the animal skin that has currently warrants attention.
Fossils of Beipaiosaurus include impressions of its skin and these clearly show long, broad filaments clumped around its head, neck, rump and tail. They are feathers, but most unusual ones. Traces…
clock | January 12, 2009From SCONC:
The next Sigma Xi Pizza Lunch is noon, THURSDAY. Jan. 22. The title: "Dinosaurs under the microscope: New ways to look at old bones."
Come hear NC State University paleontologist Mary Schweitzer explain why she rocked science not long ago with evidence that soft tissue survived in a 68-million-year-old dinosaur fossil. Not all fossil experts accept it, but many do. If Schweitzer is correct, she's found a whole new route to explore the biology and evolutionary lineage of extinct life.
Pizza Lunch is free and open to science journalists and science communicators of all stripes.…
grrlscientist | December 19, 2008tags: evolution, behavioral ecology, parental care, egg incubation, dinosaurs, birds
The Oviraptorid dinosaur, Citipati osmolskae,
on a nest of eggs that was unearthed in the Gobi desert
of Mongolia by the American Museum of Natural History.
Image: Mick Ellison, American Museum of Natural History.
Oviraptors ("egg seizer") were given their name because their fossil remains were first discovered on top of a pile of eggs. Because of their close proximity to clutches of dinosaur eggs, it was initially assumed that these dinosaurs were eating them. However, in his 1924 paper, their…
grrlscientist | December 18, 2008tags: Austroraptor cabazai, dinosaurs, Dromaeosauridae, birds, fossils, taxonomy, evolution
The newly unveiled Austroraptor cabazai (left) attacks a juvenile sauropod dinosaur in an artist's interpretation.
The giant raptor, found in Argentina, measured between 16.5 and 21 feet (5 to 6.5 meters) long, making it one of the largest raptors to roam Earth 70 million years ago, a new study finds.
A dramatic new carnivorous dinosaur that was bigger than a car was unveiled yesterday in public at the Museo Argentino de Ciencias Naturales (the Argentine, or Bernardino Rivadavia, Museum of Natural…
edyong | December 18, 2008In 1995, a palaeontologist called Mark Norrell reported an amazing discovery - the fossilised remains of a dinosaur called Troodon, sitting on top of a large clutch of eggs. The fossil was so well-preserved and its posture so unmistakeable that it provided strong proof that some dinosaurs incubated their eggs just as modern birds do. And since then, two other small predatory species - Oviraptor and Citipati - have been found in brooding positions on top of egg clutches.
But a subtler look at these fossils reveal much more about dinosaur parenting than the simple fact that it existed. To…
gregladen | October 1, 2008Welcome to the Third Edition of the Carnival of Evolution. The previous edition of this web log 'carnival of the vanities' was at Jason Rosenhouse's Evolution Blog. The next edition will be written by Mike (TUIBG) and hosted here, at Clashing Cultures.
Please submit your web posts on Evolution for the next carnival, which is slated for Mid October! Use this handy dandy submission form. And now, on with the show:
Newly reconstructed Neanderthal female. (View larger image) A Very Remote Period Indeed presents Fear and Loathing in the Pleistocene.
"... [the] narrator announces "Today,…
gregladen | September 29, 2008Fossils of a newly discovered species of dinosaur -- a 10-meter-long, elephant-weight predator -- were discovered in 1996 along the banks of Argentina's Rio Colorado, and are now being reported after a long period of careful study. This dinosaur dates to about 85 million years (which falls within the Cretaceous period).
Perhaps the most interesting feature of Aerosteon riocoloradensis is that it demonstrates the evolution of a bird-like respiratory system in an animal that is definitely not bird-like in most other ways. Indeed, the authors of this paper imply that this dinosaur's…
gregladen | July 29, 2008 An ugly fact killing a beautiful hypothesis I'm not mentioning any names, and don't ask me any details. In fact, don't repeat this story.
Some years ago, when I was a mere graduate student, a fellow student working in an unnamed country in Africa discovered a very very old stone artifact. To this day, this bit of chipped stone debris, representing the activities of an ancient very pre-human hominid, is one of the oldest well dated, in situ objects of its kind known.
The stone had some yeck on it, and for giggles, this stone got passed on to a physicist who had invented a new way of…
gregladen | July 24, 2008Notice how I put "complete skeleton" in quotes. A paleontologist's idea of complete is not exactly the same as everyone else's.. But this Gobi Desert Tyrannosauris-like Tarbosaurus has a lot of its bone. It was recently extracted from sandstone blocks dug up a couple of years ago.
Another nice thing about this fossil is that it is a youngster, roughly the size of Barny the Dinosaur. The five year old dinosaur dates to about 70 million years ago. (more info)
What is even more intereting is that the research was conducted by a natural history museum owned by a private high tech company,…
grrlscientist | July 10, 2008tags: researchblogging.org, melanosomes, plumage color, feather color, fossil preservation, birds, dinosaur, Jakob Vinther
Male Red-bellied woodpecker, Melanerpes carolinus.
Image: Ken Thomas (Wikipedia) [larger view].
When looking at paintings and reconstructions of fossil birds and dinosaurs, people often ask "how do you know what color they were?" Well, we didn't. However, a new paper was just published in Biology Letters that explores the possibility of deciphering the actual color of fossilized plumage and makes a startling discovery: scientists can identify at least some of the…
gregladen | June 16, 2008The first dinosaur bones (that we know of) to have been discovered in British Columbia, Canada, are now being reported. These are bones found in 1971, eventually making their way to the Royal British Columbia Museum, and now being reported by V.M. Arbour and M.C. Graves. The bones were initially found by Kenny Flyborg Larsen, a geologist prospecting for thorium. He was drawn to these bones because the bones themselves are radioactive, and his instruments led him to them.
(This is an update on this, as Arbour kindly sent me a copy of the original paper.)
Arbour and Graves go through great…
gregladen | June 16, 2008All I have is a lousy press release, since my University does not subscribe to this journal. (Well,we get it but I am not allowed to see the most recent six months!). So here it is:
Edmonton - A partial dinosaur skeleton unearthed in 1971 from a remote British Columbia site is the first ever found in Canadian mountains and may represent a new species, according to a recent examination by a University of Alberta researcher.
Discovered by a geologist in the Sustut Basin of north-central British Columbia 37 years ago, the bones, which are about 70 million years old, were tucked away until…
gregladen | June 12, 2008Giant Dinosaurs of the Jurassic is a children's book for kids in third to fifth grade or, in my opinion, a little younger. Certainly this is an excellent choice, because of the cool illustrations, of a book to read aloud to the pre-literate little ones.
Author Gregory Wenzel does a good job in few words explaining life in the Jurassic, how bones get to become fossils, and something about how they are found. Most of the riveting several hundred words in this 32 page book are about the real stars of the show, the dinosaurs themselves.
Not every single dinosaur in this book is truly giant, but…
sporte | June 9, 2008What are you learning in school?
xkcd has the inside track on the really important stuff.