久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Society

Fossilized tracks show dinosaurs could swim

By Cheng Yingqi | China Daily | Updated: 2013-04-12 00:27

One hundred million years ago, a fierce carnivorous dinosaur chased a smaller dinosaur all the way to the river bank. Because of its fear of water, the predator stopped, as its prey jumped into the water and swam away.

So the story would go in popular science literature, but a carnivorous dinosaur that lived somewhere in the mountainous area of southwestern Sichuan province did not stop. It jumped into the water and left a 15-meter track of claw marks.

On Monday, Chinese scientists announced that they found swim tracks of a carnivorous dinosaur, producing strong evidence that two-legged dinosaurs were good swimmers.

Fossilized tracks show dinosaurs could swim

Paleontologists make a mold of claw marks that might have been left by a swimming dinosaur in Zhaojue county, Sichuan province. XING LIDA / FOR CHINA DAILY

The swim tracks found on a mountain in Zhaojue county, Sichuan, are the first well-preserved example of a swimming carnivorous dinosaur in Asia, and an addition to the scant examples of such tracks being found anywhere.

The research was published in Chinese Science Bulletin on Monday.

"Dinosaur swim tracks have been found in Britain, Poland, the United States and Spain. Compared with earlier tracks, ours is special because it is well preserved and rather long," said Xing Lida, an author of the research.

"I suddenly had a flash when I saw the claw prints: every footprint was formed of three parallel claw marks, which extend all the way up along the rock ledge," Xing said.

"The dinosaur's claw marks show it was swimming along in this river and just its tiptoes were touching bottom," said Scott W. Persons IV, a co-author of the paper.

Based on the claw marks, which cover a distance of 15 meters, the researchers infer that the dinosaur swam with coordinated leg movements.

"The dinosaur swims by alternating movements of its hind legs, which push it forward like oars," said Martin Lockley, a co-author from the US.

"Swimming could be the born ability of dinosaurs, just like dogs'," he said.

Worldwide, the first compelling evidence of dinosaurs being able to swim was discovered in 2007, when 12 footprints were found in the bed of an ancient lake in northern Spain.

Fossilized tracks show dinosaurs could swim

A computer-generated image of a swimming dinosaur. PROVIDED TO CHINA DAILY

China could have found more dinosaur tracks of this kind though, the latest being found is just a lucky survival.

Some tracks in the same mountain region had been exposed during a mining operation in 2003, when a miner found hundreds of indentations on the surface of a slope where a charge had been detonated.

At least 12 tracks were clearly visible. But before anyone could look closely at them, another charge was detonated and the tracks were gone.

In 2006, paleontologists researched other indentations in nearby area and found they were fossil-footprints of Jurassic age dinosaurs.

With the hope of finding remaining dinosaur footprints, Xing and his team arrived at the mining site in 2012 and found the tracks.

"The protection of ancient remains of dinosaurs is not enough. Most people only care about the fossilized skeletons of dinosaurs, but the trace fossils, like footprints, should be protected too," Xing said.

Editor's picks
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    26uuu亚洲| 欧美激情一区二区三区四区| 天堂成人国产精品一区| 欧美男男青年gay1069videost| 亚洲伊人伊色伊影伊综合网| 欧美性生活一区| 日本三级韩国三级欧美三级| 精品免费一区二区三区| 国产成人午夜精品5599 | 精品国产自在久精品国产| 九九热在线视频观看这里只有精品| 精品国产三级a在线观看| 国产福利一区二区三区| 亚洲视频小说图片| 欧美日韩免费视频| 狠狠v欧美v日韩v亚洲ⅴ| 国产蜜臀av在线一区二区三区| 色综合久久天天| 日韩av成人高清| 国产日韩欧美激情| 色成年激情久久综合| 蜜桃视频第一区免费观看| 国产精品网站在线| 欧美日韩免费视频| 国产成人综合在线播放| 亚洲在线中文字幕| 欧美tk—视频vk| 91在线观看地址| 日韩专区在线视频| 欧美国产精品一区| 欧美日韩一区小说| 国产精品一区在线观看乱码| 亚洲精品乱码久久久久久黑人| 欧美一区二区免费| 不卡一区二区中文字幕| 五月综合激情网| 欧美经典一区二区三区| 亚洲婷婷在线视频| 制服丝袜中文字幕一区| 成人一区二区三区| 日日摸夜夜添夜夜添亚洲女人| 国产婷婷色一区二区三区| 欧美在线不卡视频| 国产又黄又大久久| 亚洲一级片在线观看| 国产亚洲成av人在线观看导航| 欧美亚洲国产一卡| 国产99精品在线观看| 日本免费新一区视频| 亚洲视频一区在线| 久久人人爽人人爽| 欧美精品高清视频| 99精品偷自拍| 国内精品视频一区二区三区八戒| 夜夜精品浪潮av一区二区三区| 国产视频一区不卡| 777精品伊人久久久久大香线蕉| av亚洲精华国产精华精华| 麻豆精品国产91久久久久久| 亚洲一区国产视频| 国产精品女人毛片| 精品国产髙清在线看国产毛片| 欧美系列亚洲系列| 成人av电影在线播放| 极品瑜伽女神91| 视频在线观看国产精品| 亚洲乱码国产乱码精品精小说 | 91精品国产aⅴ一区二区| 91免费国产在线| 国产成人综合在线| 久久精品国产77777蜜臀| 亚洲国产欧美日韩另类综合 | 亚洲成a天堂v人片| 自拍偷自拍亚洲精品播放| 久久精品人人爽人人爽| 欧美一级二级在线观看| 欧美日韩中文字幕精品| 91日韩在线专区| 成人在线视频一区二区| 激情图片小说一区| 欧美96一区二区免费视频| 亚洲国产成人av| 亚洲美女区一区| 国产精品福利一区二区三区| 国产日韩在线不卡| 欧美精品一区二区三区在线播放 | 欧美日韩国产综合一区二区| 一本久久a久久精品亚洲| 不卡视频在线看| 粉嫩久久99精品久久久久久夜| 久久99国产精品尤物| 日本91福利区| 日本中文字幕不卡| 午夜视频一区二区三区| 亚洲成在线观看| 亚洲一区在线电影| 亚洲黄色在线视频| 亚洲美女少妇撒尿| 亚洲蜜臀av乱码久久精品| 亚洲免费观看高清| 一区二区三区欧美视频| 亚洲最大的成人av| 一区二区三区蜜桃网| 一区二区三区欧美| 亚洲一区二区在线视频| 一级特黄大欧美久久久| 亚洲一区二区在线免费观看视频 | 久久成人久久鬼色| 精一区二区三区| 久久99久久精品欧美| 紧缚捆绑精品一区二区| 国产精品亚洲а∨天堂免在线| 国产精品99久| 粉嫩av一区二区三区在线播放| 成人午夜视频在线观看| 国产不卡视频一区| 99久久免费视频.com| 色综合久久88色综合天天免费| 色天使色偷偷av一区二区| 欧洲av一区二区嗯嗯嗯啊| 欧美综合天天夜夜久久| 欧美日韩极品在线观看一区| 91精品麻豆日日躁夜夜躁| 日韩精品一区二区三区蜜臀| 亚洲精品一区二区三区影院 | 91老师国产黑色丝袜在线| 日本电影欧美片| 欧美片在线播放| 欧美大黄免费观看| 国产偷v国产偷v亚洲高清 | 成人欧美一区二区三区在线播放| 日韩毛片视频在线看| 亚洲午夜精品在线| 奇米精品一区二区三区在线观看一 | 亚洲一区二区美女| 日韩av网站在线观看| 紧缚奴在线一区二区三区| 北岛玲一区二区三区四区| 91久久免费观看| 91麻豆精品国产91久久久| 久久久久国产一区二区三区四区| 国产精品乱码人人做人人爱 | 激情综合一区二区三区| 成人手机电影网| 欧美日韩国产三级| 久久色在线视频| 亚洲免费观看高清完整版在线观看熊| 日韩精品电影在线观看| 国产精品小仙女| 色吧成人激情小说| 欧美大片在线观看| 综合久久一区二区三区| 日本欧美韩国一区三区| 丁香激情综合五月| 欧美人妖巨大在线| 国产日韩在线不卡| 亚洲成av人片在www色猫咪| 国产一区日韩二区欧美三区| 一本一道久久a久久精品综合蜜臀 一本一道综合狠狠老 | 懂色一区二区三区免费观看| 91麻豆产精品久久久久久| 欧美日韩国产免费| 国产欧美日韩一区二区三区在线观看| 亚洲欧美区自拍先锋| 国产精品福利影院| 美腿丝袜亚洲综合| 成人网在线播放| 欧美日韩激情一区| 国产精品网站导航| 天堂成人国产精品一区| 国产91富婆露脸刺激对白| 色综合天天狠狠| 精品sm在线观看| 亚洲少妇中出一区| 奇米888四色在线精品| 色天天综合久久久久综合片| 久久久亚洲午夜电影| 亚洲午夜精品久久久久久久久| 激情深爱一区二区| 欧美四级电影在线观看| 久久精品欧美日韩| 亚洲成人av一区二区| 成人免费黄色在线| 69av一区二区三区| 亚洲色图欧美在线| 极品少妇一区二区| 欧美影视一区在线| 久久日韩粉嫩一区二区三区| 婷婷开心久久网| 波多野结衣在线aⅴ中文字幕不卡| 4438成人网| 亚洲黄网站在线观看| 国产高清成人在线| 欧美日韩高清一区二区不卡| 亚洲精品一二三区| 国产福利不卡视频| 日韩一区二区麻豆国产| 亚洲国产日韩综合久久精品| 成人av资源下载| 精品国产1区二区|