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独特化石记录45.61.244,美国BGP优化服务器怎么选月付商家,小行星撞地球瞬间 美专家研究引热议
2019-04-06 03:18

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45.61.244.253  45.61.244.254  45.61.244.25

在佛罗里达大西洋大学担任地质学副教授的古生物学家罗伯特·德帕尔马表示,他可以解释地球历史上最灾难性的事件之一:一颗小行星撞向现在墨西哥海岸后几分钟和几小时的场景。

据法新社4月1日报道,6600万年前希克苏鲁伯小行星的撞击在地球上产生了一个巨大的陨石坑,造成陆地和海洋生物大量灭绝。

报道称,过去7年,德帕尔马一直在美国北达科他州的一处遗址进行挖掘,他和其他科学家认为,这处遗址为当时所发生的一切的提供了独特化石记录。

37岁的古生物学家德帕尔马和另外11名共同作者4月1日在美国《国家科学院学报》杂志上发表了一篇关于这一发现的初步研究报告,在科学界引发热议。

德帕尔马首次开始在北达科他州“地狱溪地层”一处名为“塔尼斯”的化石遗址挖掘时还是在美国堪萨斯大学当研究生时。

过去几年,德帕尔马和几位助手在一个约四英尺(约1.3米)厚的沉积物层里发现了鱼、植物、树和软体动物混杂在一起的化石。“这些沉积物几乎是瞬间凝固的,”德帕尔马说。

德帕尔马将其比作庞贝古城,公元79年罗马的庞贝古城被火山喷发埋葬,从而使得该城被完好地保存下来。他说,“与庞贝古城非常相似”,“许多不同的东西被瞬间保存下来。”

报道称,科学家们一直以来都把恐龙的灭绝以及包括人类在内的哺乳动物的崛起指向希克苏鲁伯陨石的撞击。

火焰、浓烟、灰烬和残骸吞噬了大气,最终摧毁了几乎所有的植物,并灭绝了地球上75%的物种。

科学家们认为,希克苏鲁伯撞击引发了强烈的地震,地震波在13分钟后抵达了塔尼斯。地震海啸还引发了裹挟着各种残骸的巨大洪流。

德帕尔马说,塔尼斯化石遗址中依稀可见海啸过后扭曲纠缠在一起的淡水鱼、陆生脊椎动物、树、树枝、断木、鹦鹉螺和其他海洋生物遗骸。

报道称,此外,在塔尼斯遗址中发现的许多化石都是三维保存下来的,而不是平面的。(编译/许燕红)

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