Board logo

標題: Photo Gallery: Permian Period [打印本頁]

作者: 路人甲    時間: 2008-4-24 08:05 PM     標題: Photo Gallery: Permian Period

A sail-backed dimetrodon forages amid a Permian landscape in this artist's depiction. These primitive predators, though dinosaur-like in appearance, are actually considered the forerunners of mammals. Scientists think their large back fins were used to regulate body temperature.

The Permian period saw the creation of the supercontinent Pangaea, where shallow seas in and around the huge landmass offered a home to an abundance of life. This diorama at the University of Michigan's Museum of Natural History shows some of the flora and fauna that thrived in Permian seas, including trilobites, gastropods, clams, nautiluses, and corals.

Nautiluses, like this one swimming in the waters off Palau, Micronesia, have changed little in their 270-million-year history. The first nautiluses appeared during the Permian period and were among only a handful of organisms to survive the widespread extinctions that wiped out nearly 95 percent of life on Earth about 250 million years ago.

Paleontologists (from left) Stuart Sumida, David Berman, and Thomas Martens examine the fossilized remains of a young Orobates pabsti, an ancient herbivorous reptile that lived some 290 million years ago at the beginning of the Permian. The remains were found in 2006 at Germany's Bromacker Quarry, one of the world's most productive sites for Permian-era fossil finds.

An artist's depiction shows lystrosaurs foraging near a stream. Flat-faced with a beak and two teeth that resembled tusks, lystrosaurs were synapsids, animals that arose in the Permian and eventually gave rise to mammals.

A quarter of a billion years ago, long before dinosaurs or mammals evolved, the 10-foot (0.3-meter) predator Dinogorgon, whose skull is shown here, hunted floodplains in the heart of today's South Africa. In less than a million years Dinogorgon vanished in the greatest mass extinction ever, along with about nine of every ten plant and animal species on the planet.

From : Nationalgeographic
作者: Franco仔    時間: 2008-4-24 10:06 PM

290 million years ago 二疊紀時代


[ 本帖最後由 Franco仔 於 2008-4-24 10:14 PM 編輯 ]
作者: rock-tw    時間: 2008-4-25 06:58 AM

作者: nelsonkeung    時間: 2008-4-26 11:24 AM

原帖由 rock-tw 於 2008-4-25 06:58 AM 發表


二疊紀期間,看到創造了超盤古大陸,其中淺海和周圍的巨大的地塊提供了回家了豐富的生活。這diorama在密西根大學的自然歷史博物館表明,一些動植物指出,蓬勃發展,在二疊紀公海,包括三葉蟲,腹足類,蛤, nautiluses ,和珊瑚。

nautiluses ,就像這一次游泳在對開水域帕勞,密克羅尼西亞,有變化不大,在其270萬年的歷史。第一nautiluses出現在二疊紀時期,其中只有極少數的生物體生存的廣泛的物種滅絕消滅了近95 %的地球上的生命大約2.5億年前。

古生物學家(左起)斯圖爾特隅田川,大衛伯爾曼,和托馬斯馬爾頓研究化石仍然是一個年輕orobates pabsti ,一個古老的爬蟲類動物的草食性生活的一些2.9億年前,在開始二疊紀。遺體被發現於2006年在德國的bromacker石礦場,世界上其中一個最有生產力的網站為二疊紀時代的化石發現。

一個藝術家的寫照顯示lystrosaurs覓食附近的流。平板面臨著一個嘴和兩個牙齒認為,類似於象牙, lystrosaurs被synapsids ,動物出現在二疊紀,並最終引起了哺乳動物。

一季度的1億多年前,早在恐龍或哺乳動物的演變, 10英尺( 0.3米)捕食者dinogorgon ,其頭骨是在這裡顯示,打獵,在洪氾區的心臟,今天的南非。在不到一萬元,年dinogorgon消失在最大的絕滅以往任何時候都,隨著約9每10植物和動物物種在地球上。

來自: nationalgeographic

歡迎光臨 化石講場-Fossils Board ( Powered by Discuz! 4.1.0