北美洲发现有1.3万年历史的野牛骨骼化石
文章来源:未知 文章作者:enread 发布时间:2016-05-12 07:51 字体: [ ]  进入论坛
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In what is considered one of the oldest and most important archaeological digs in North America, scientists have uncovered what they believe are the bones of a 13,000- to 14,000-year-old ancient, extinct species of bison at the Old Vero Man Site in Vero Beach, Fla. Archaeologists from Florida Atlantic University's Harbor Branch Oceanographic Institute made this discovery just 10 feet below the ground's surface during the final stretch of the 2016 excavation1 efforts at the Vero Beach site. The bone was found below a layer that contained material from the Pleistocene period when the last ice age was thought to have occurred. The archaeologists identified the bison using an upper molar, which is thought to be representative of a Bison antiquus, a direct ancestor of the American bison that roamed North America until it became extinct. Because bison was a grassland-adapted animal, nearly 100 percent of their bones disintegrated2 after death unless they were preserved in some way.
 
"This finding is especially significant because of the meticulous3 documentation that has been involved," said James M. Adovasio, Ph.D., principal investigator4. "Along with the fact that bones like this have never been found on land as part of a calculated archaeological effort. Others like this have all been found underwater, in sinkholes or streams." 
 
Bison antiquus, sometimes referred to as the "ancient bison," was the most common large herbivore of the North American continent for more than 10,000 years, and is a direct ancestor of the living American bison. They were approximately 8 feet tall, 15 feet long and weighed close to 3,500 pounds. 
 
"We couldn't have asked for a better representative species from that era," said Andrew Hemmings, Ph.D., lead archaeologist. "We now know that people were here in Vero Beach at that time."


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1 excavation RiKzY     
n.挖掘,发掘;被挖掘之地
参考例句:
  • The bad weather has hung up the work of excavation.天气不好耽误了挖掘工作。
  • The excavation exposed some ancient ruins.这次挖掘暴露出一些古遗迹。
2 disintegrated e36fb4ffadd6df797ee64cbd05a02790     
v.(使)破裂[分裂,粉碎],(使)崩溃( disintegrate的过去式和过去分词 )
参考例句:
  • The plane disintegrated as it fell into the sea. 飞机坠入大海时解体了。
  • The box was so old;it just disintegrated when I picked it up. 那箱子太破旧了,我刚一提就散了。 来自《简明英汉词典》
3 meticulous A7TzJ     
adj.极其仔细的,一丝不苟的
参考例句:
  • We'll have to handle the matter with meticulous care.这事一点不能含糊。
  • She is meticulous in her presentation of facts.她介绍事实十分详细。
4 investigator zRQzo     
n.研究者,调查者,审查者
参考例句:
  • He was a special investigator for the FBI.他是联邦调查局的特别调查员。
  • The investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。
TAG标签: bones animal bison
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