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عصر ما قبل الكامبريّ – The Precambrian هو الاسم الّذي يطلق على أعظم مدة زمنية من تاريخ الأرض.استمر حوالَي 4.6 مليار سنة ويتكوّن دهر ما قبلَ الكامبريّ من ثلاثِ حِقَبٍ، وهي: دهر (Hadean) أو الجهنميّة،(بين 4000-2500 مليون سنة). ودهر الأركيّة (بين Archean(ملييون سنة4600-4000) ودهر البروتيروزوي(Proterozoic) أو حقبة الحياة الأوّليّة(بين2500 إلى 538.8 مليون عام) . وتعرّف بعض العلماء إلى الحقبة الرّابعة الّتي يُطلق عليها Chaotian، وهو العصر الّذي سبق الآخرين، وهو الوقت الأول لأول تكوين لنظامنا الشّمسيّ.
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