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白堊紀 攷 導覽選單baak6 ngok3 gei5充實

地質時代


粵拼英文侏羅紀古近紀恐龍銥墨西哥灣白堊紀-第三紀滅絕












白堊紀




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白堊紀
表達錯: 未預料嘅 round 運算符表達錯: 未預料嘅 round 運算符百萬年前

PreЄ

Є

O

S

D

C

P

T

J

K

Pg

N




全時期平均大氣O2含量

大概30 Vol %[1]
(家下嘅150% )


全時期平均大氣CO2含量

大概1700 ppm[2]
(係前工業時期6倍)


全時期平均地表溫度

大概18℃[3]
(高過家下4℃)



白堊紀(粵拼:baak6 ngok3 gei5;英文:Cretaceous)係6.5千萬至1.35億年前嘅一個地質時代,位於侏羅紀同埋古近紀之間,係恐龍時代中生代嘅最後一個紀。白堊紀呢個名來自喺呢個紀岩石層裏面常見嘅白堊。雖然呢段時間嘅岩石標誌非常明顯同清晰,但佢嘅準確開始時間就如同其他古遠嘅地質時代無法被非常精確咁確定。佢嘅誤差喺幾百萬年之間。


佢結束嘅時間定得比較準,係喺6,430萬年前左右,嗰時全地球嘅岩石層都含大量嘅銥。一般認為,嗰時有一粒巨大嘅隕石撞擊地球,喺而家墨西哥灣附近有一個大坑。呢個隕石造成大量生物滅絕,稱為白堊紀-第三紀滅絕事件。但呢個理論而家重有爭議。







  1. Image:Sauerstoffgehalt-1000mj.svg


  2. Image:Phanerozoic Carbon Dioxide.png


  3. Image:All palaeotemps.png











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