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توثيق الفترة الزمنية (Info)


وثقت اللجنة الدولية للطبقات العصر البارد في عام 1990. وعلى عكس معظم العصور الزمنية الأخرى، فإن بداية العصر البارد لا يرتبط بأي حدث ملاحظ وموثق عالميا. في حين أنه تم تعريف قاعدة هذا العصر من خلال عمر الصخور الثابتة، التي تم تعيينها بالأصل في الفترة 850 مليون سنة مضت، ولكن تم تغييره في عام 2015 إلى 720 مليون سنة مضت. إن هذا الأمر مثير للمشاكل لأن تقديرات أعمار الصخور متغيرة وتخضع لأخطاء مختبرية. على سبيل المثال، العصر الكامبري لا يُحسب النطاق الزمني له بصخور أصغر من عمر معين (541 مليون سنة)، ولكن عن طريق ظهور الآثار الأحفورية لتجمع جحور تريبتكنوس (Treptichnus pedum). وهذا يعني أنه يمكن التعرف على الصخور عند فحصها في الحقل على أنها من الكامبري، ولا تتطلب إجراء اختبار مكثف في المختبر للعثور على تاريخ.

حاليا، لا يوجد اتفاق في الآراء حول الحدث العالمي المناسب والمرشح لبداية العصر البارد، لكن التجلد العالمي سيكون المرشح المحتمل.

Source: wikipedia.org
Points From The Lecture Meaning Of Period Time

Points From The Lecture Meaning Of Period Time

 
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The Victory Of The Period And The Age Of Instinct

The Victory Of The Period And The Age Of Instinct
2960 Hadith Book Issa Bin Hisham Or Period Of Time

2960 Hadith Book Issa Bin Hisham Or Period Of Time

 
Public Domain
History of the Jews in America From the Period of the Discovery of the New World to the Present Time

History of the Jews in America From the Period of the Discovery of the New World to the Present Time
Public Domain
The Book-Collector A General Survey of the Pursuit and of those who have engaged in it at Home and Abroad from the Earliest Period to the Present Time

The Book-Collector A General Survey of the Pursuit and of those who have engaged in it at Home and Abroad from the Earliest Period to the Present Time
Public Domain
A History Of Horncastle, From The Earliest Period To The Present Time

A History Of Horncastle, From The Earliest Period To The Present Time
  (1)
Critical Period

Critical Period

 
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The Hadith Of Isa Bin Hisham - Or - A Period Of Time

The Hadith Of Isa Bin Hisham - Or - A Period Of Time
Public Domain
All-Wool Morrison Time -- Today, Place -- the United States, Period of Action -- Twenty-four Hours

All-Wool Morrison Time -- Today, Place -- the United States, Period of Action -- Twenty-four Hours
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The Victory Of The Period And The Age Of Instinct

The Victory Of The Period And The Age Of Instinct
Public Domain
The Child's Pictorial History of England From the Earliest Period to the Present Time

The Child's Pictorial History of England From the Earliest Period to the Present Time
Public Domain
The Fixed Period

The Fixed Period
Public Domain
A History Of Germany: From The Earliest Period To The Present Time

A History Of Germany: From The Earliest Period To The Present Time
Public Domain
Developments During The Period, 1927-1941..

Developments During The Period, 1927-1941..

 
  (1)
Public Domain
A History Of Greek Philosophy From The Earliest Period To The Time Of Socrates

A History Of Greek Philosophy From The Earliest Period To The Time Of Socrates
Third Period Note

Third Period Note

 
Public Domain
A History Of Greek Philosophy From The Earliest Period To The Time Of Socrates

A History Of Greek Philosophy From The Earliest Period To The Time Of Socrates
Public Domain
The Every Day Book of History and Chronology Embracing the Anniversaries of Memorable Persons and Events in Every Period and State of the World, from the Creation to the Present Time

The Every Day Book of History and Chronology Embracing the Anniversaries of Memorable Persons and Events in Every Period and State of the World, from the Creation to the Present Time
Public Domain
Catalogue Of The Medals Of Scotland From The Earliest Period To The Present Time

Catalogue Of The Medals Of Scotland From The Earliest Period To The Present Time
  (1)
Public Domain
The Hadith Of Isa Bin Hisham - Or - A Period Of Time

The Hadith Of Isa Bin Hisham - Or - A Period Of Time
Public Domain
The Hadith Of Isa Bin Hisham - Or - A Period Of Time

The Hadith Of Isa Bin Hisham - Or - A Period Of Time
Public Domain
Anthology Of Russian Literature From The Earliest Period To The Present Time

Anthology Of Russian Literature From The Earliest Period To The Present Time
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Temporary Period

Temporary Period
The Phoenicians In Egypt During The Period 948 To 715 Bc

The Phoenicians In Egypt During The Period 948 To 715 Bc

 
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Germany : From The Earliest Period

Germany : From The Earliest Period
Public Domain
The Fixed Period

The Fixed Period
Public Domain
Germany : From The Earliest Period

Germany : From The Earliest Period
Public Domain
Germany : From The Earliest Period

Germany : From The Earliest Period
Public Domain
Germany : From The Earliest Period

Germany : From The Earliest Period
Public Domain
A History Of Germany; From The Earliest Period To The Present Time

A History Of Germany; From The Earliest Period To The Present Time
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Critical Period

Critical Period
Public Domain
Abridgement Of The History Of India From The Earliest Period To The Present Time

Abridgement Of The History Of India From The Earliest Period To The Present Time
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Test Period #7

Test Period #7
Public Domain
Anthology Of Russian Literature From The Earliest Period To The Present Time

Anthology Of Russian Literature From The Earliest Period To The Present Time
Public Domain
Anthology Of Russian Literature From The Earliest Period To The Present Time

Anthology Of Russian Literature From The Earliest Period To The Present Time
Public Domain
The Bible Period by Period A Manual for the Study of the Bible by Periods

The Bible Period by Period A Manual for the Study of the Bible by Periods

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Mustafa Mahmoud The Words Of God Almighty Ibrahim AlFiqi Muhammad Bin Saleh AlUthaymeen Ibn Qayyim Al-Jawziyya Ahmed Khaled Tawfiq Fahad Amer AlAhmadi Muhammad Metwally AlShaarawi Ali Bin Jaber AlFifi Dale Carnegie Islam Gamal Sayed Qutb Muhammad AlGhazali Omar AlHourani Agatha Christie Muhammad Bin Ismail AlBukhari Abbas AlAkkad Abu Hamid AlGhazali Najib Mahfouz Fyodor Dostoevsky Jalal AlDin AlSuyuti Bin Taymiyyah Ismail Bin Omar Bin Katheer AlQurashi Aldamashqiu Ibrahim Al-Sukran Mustafa AlAdawi More of Authors of books