[QODLink]
Archive
When dinosaurs grazed
Fossilised dinosaur droppings found in central India show that giant dinosaurs known as titanosaurs ate grass, reports an international team of researchers.
Last Modified: 17 Nov 2005 20:10 GMT
The find was made by an institute in India
Fossilised dinosaur droppings found in central India show that giant dinosaurs known as titanosaurs ate grass, reports an international team of researchers.

Few scientists had ever thought that dinosaurs grazed, because there was no evidence that grasses existed that long ago.

They believed that the grinding teeth found in some dinosaur fossils were used for munching other plant matter, perhaps trees, like modern beavers chew on today.

'Very exciting'

So when Caroline Stromberg of the Swedish Museum of Natural History received photographs of fossilised dinosaur droppings from Vandana Prasad of the Birbal Sahni Institute of Palaeobotany in Lucknow, India, she hardly expected to see
pieces of grass in them.

Fossils of rodents who may have
grazed have been found

"I was very surprised to see them and even more surprised to see that there was quite a diversity," Stromberg said in a telephone interview. "It was shocking but very exciting."

Prasad's team had been analysing 65-million-year-old coprolites - fossilised droppings - that they believe were left by giant plant-eating sauropod dinosaurs.

They found the expected plant matter - cycads and conifers and other plants known to have grown during the Cretaceous
period.

Grass eaters

Prasad's team sent some photographs and then samples to Stromberg, who spotted tiny silica structures called phytoliths.

 "It was shocking but very exciting"

Caroline Stromberg,
Swedish Museum of Natural
History

"It's indisputable that these are from grasses. The shape of these phytoliths indicate that they are from grasses," said Dolores Piperno, a paleobotanist at Washington's Smithsonian Institution who reviewed the study, published in the journal Science.

Not only that, but they clearly came from very different species of grass.

"It's certainly the first unambiguous evidence that grasses had originated by the late Cretaceous period and also that they had considerably diversified," Piperno said in a telephone interview.

Forest dwellers

That suggests that grasses had been around for a long time even back then.

Stromberg said some of the grass phytoliths look like those found in modern day rice.

"One could imagine that at least some of them lived in rather humid areas perhaps, probably forest-living grasses," she said in a telephone interview.

"Those tend to have broader leaves than the grasses in your lawn, for example. They are not grasses that you normally associate with open habitat like the prairie. A guess would be that they looked more like herbaceous bamboos, but it's very much a guess."

Mammals

The only other hints of such old grasses had come from pollen fossils, which are much more difficult to identify.

The findings also suggest that early mammals may have grazed. The few fossils that have been found from the rodent-like mammals that lived alongside dinosaurs have mystified scientists - especially the teeth.

"They look very much like teeth of animals that grazed today like horses, but much smaller of course," Stromberg said.

"This may explain it."

Source:
Reuters
Topics in this article
People
Country
Featured on Al Jazeera
UNHCR says hundreds of people trapped in Yaloke town risk death if they are not evacuated to safety urgently.
'Justice for All' demonstrations swell across the US over the deaths of African Americans in police encounters.
Six former Guantanamo detainees are now free in Uruguay with some hailing the decision to grant them asylum.
Disproportionately high number of Aboriginal people in prison highlights inequality and marginalisation, critics say.
Featured
Long-standing dispute over Christian use of the word 'Allah' raises concerns about a very un-Merry Christmas.
The threat posed by ISIL has prompted thousands of young Kurds to join the PKK.
Baja California - with its own grim history of disappeared people - finds a voice in the fight against violence.
Russian feminist rockers fight system holding 700,000 - the world's largest per capita prison population after the US.
Weeks of growing protests against Muslims continue in Dresden with 15,000 hitting the streets last Monday.