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(連續圖畫的第五張)

EVOLUTION UNDER WAY  ~6 million years

Orrorin tugenensis is considered to be the second-oldest known hominin ancestor that is possibly related to modern humans and is the only species classified in genus Orrorin. The name was given by the discoverers who found Orrorin fossils in the Tugen Hills of Kenya. By using radiometric dating techniques, the volcanic tuffs and lavas, faunal correlation and magneto-stratigraphy, the strata in which the fossils were found were estimated to date between 6.1 and 5.8 million years ago, during the Miocene. This find is important because it is possibly an early bipedal hominin. (click to see all the article on Wikipedia)

Ardipithecus is a very early hominin genus (subfamily Homininae). Two species are described in the literature: A. ramidus, which lived about 4.4 million years ago during the early Pliocene, and A. kadabba, dated to approximately 5.6 million years ago (late Miocene). (click to see all the article on Wikipedia)

演化仍在進行中 ~6百萬年前

圖根原人被認為是已知第二古老的人族祖先,可能與現代人類有關,而且是原人屬當中的唯一種。這名字是發現者根據發現化石的地區,肯亞的圖根山區所命名的。透過放射性定年技術,火山熔灰岩及熔岩,動物群的關係以及磁地層學,估計發現化石的地層約介於61十萬年到58十萬年前,在中新世的時候。這發現相當重要,因為這可能是早期人族中使用雙足行走的證據。

地猿是人族當中非常早期的屬(人亞科)。文獻中已描述兩個物種:始祖地猿,存在於44十萬年前,於上新世早期。卡達巴地猿,存在於約56十萬年前(中新世晚期) 

(維基連結:圖根原人地猿)

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