Library guides and databases: Political Science and Public Policy: Literature Searching
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Library guides and databases: Political Science and Public Policy: Literature Searching
A subject guide for the Department of Political Science / School of Public Policy
2 months ago
PLoS期刊
古生物學家近日在期刊《PLOS One》刊登最新發現，在玻利維亞安地斯山脈的Carreras Pampas遺址發現高達16,000個獸腳類恐龍足跡，為目前全球已知數量最多的同類足跡絕錄，堪稱「恐龍高速公路」。 據報，這些足跡屬生活於6,600萬至1億年前的白堊紀晚期的三趾、雙足行走的獸腳類恐龍，包括與暴龍 Trex同屬的肉食性種類。腳印被保存於古代湖岸泥層，顯示牠們除行走、奔跑，還包括超過1300個「游泳痕跡」。 研究團隊表示牠們曾在泥濘的湖底沉積物中用爪子划動，隨後水位上升封存了這些痕跡，使其免受數百萬年的侵蝕。 古生物學家Richard Butler讚譽此次發現是「了解白堊紀末期恐龍生活的珍貴窗口」。雖然被發現的足跡數量眾多，但該區幾乎未發現恐龍骨骼、牙齒或蛋化石。 研究人員推測，該片高原曾連接南秘魯、玻利維亞與阿根廷北部的恐龍遷徙走廊，恐龍短暫穿越、飲水、覓食所留下的印記並未有長期定居。 儘管這些遺跡存留了數千萬年，但亦曾因公路工程催毁主要遺跡。目前國家公園已介入保護，科學家預期在現有挖掘區域的邊緣，還將發現更多未出土的足跡。 (新聞來源：AP News) | 香港討論區
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古生物學家近日在期刊《PLOS One》刊登最新發現，在玻利維亞安地斯山脈的Carreras Pampas遺址發現高達16,000個獸腳類恐龍足跡，為目前全球已知數量最多的同類足跡絕錄，堪稱「恐龍高速公路」。 據報，這些足跡屬生活於6,600萬至1億年前的白堊紀晚期的三趾、雙足行走的獸腳類恐龍，包括與暴龍 Trex同屬的肉食性種類。腳印被保存於古代湖岸泥層，顯示牠們除行走、奔跑，還包括超過1300個「游泳痕跡」。 研究團隊表示牠們曾在泥濘的湖底沉積物中用爪子划動，隨後水位上升封存了這些痕跡，使其免受數百萬年的侵蝕。 古生物學家Richard Butler讚譽此次發現是「了解白堊紀末期恐龍生活的珍貴窗口」。雖然被發現的足跡數量眾多，但該區幾乎未發現恐龍骨骼、牙齒或蛋化石。 研究人員推測，該片高原曾連接南秘魯、玻利維亞與阿根廷北部的恐龍遷徙走廊，恐龍短暫穿越、飲水、覓食所留下的印記並未有長期定居。 儘管這些遺跡存留了數千萬年，但亦曾因公路工程催毁主要遺跡。目前國家公園已介入保護，科學家預期在現有挖掘區域的邊緣，還將發現更多未出土的足跡。 (新聞來源：AP News) | 香港討論區
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