{"id":88949,"date":"2025-06-01T07:25:24","date_gmt":"2025-06-01T07:25:24","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88949"},"modified":"2025-06-01T07:25:24","modified_gmt":"2025-06-01T07:25:24","slug":"which-one-of-the-following-is-the-oldest-era-in-geological-history-det","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/","title":{"rendered":"Which one of the following is the oldest era in Geological History det"},"content":{"rendered":"

Which one of the following is the oldest era in Geological History determining the age of various rock types ?<\/p>\n

[amp_mcq option1=”Precambrian” option2=”Mesozoic” option3=”Cenozoic” option4=”Paleozoic” correct=”option1″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC NDA-2 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nIn the geological timescale, the largest division is the Eon. The history of the Earth is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons together are often informally referred to as the Precambrian Supereon, preceding the Phanerozoic. The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Precambrian represents the vast majority of Earth’s history, from its formation about 4.5 billion years ago until the beginning of the Paleozoic era about 541 million years ago. Therefore, the Precambrian is the oldest era (or supereon encompassing the oldest eras) listed.
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\nThe Precambrian Supereon, comprising the Hadean, Archean, and Proterozoic Eons, represents the oldest and longest interval in Earth’s geological history, preceding the Phanerozoic Eon and its subdivisions (Paleozoic, Mesozoic, Cenozoic Eras).
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\nThe Paleozoic Era saw the “Cambrian explosion” of life, the Mesozoic is known as the age of dinosaurs, and the Cenozoic is the current era, known as the age of mammals. These are all significantly younger than the Precambrian.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is the oldest era in Geological History determining the age of various rock types ? [amp_mcq option1=”Precambrian” option2=”Mesozoic” option3=”Cenozoic” option4=”Paleozoic” correct=”option1″] This question was previously asked in UPSC NDA-2 – 2023 Download PDFAttempt Online In the geological timescale, the largest division is the Eon. The history of the Earth is … <\/p>\n

Detailed SolutionWhich one of the following is the oldest era in Geological History det<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1094],"tags":[1105,1422,1106],"class_list":["post-88949","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1105","tag-geological-history","tag-world-and-physical-geography","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is the oldest era in Geological History det<\/title>\n<meta name=\"description\" content=\"In the geological timescale, the largest division is the Eon. The history of the Earth is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons together are often informally referred to as the Precambrian Supereon, preceding the Phanerozoic. The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Precambrian represents the vast majority of Earth's history, from its formation about 4.5 billion years ago until the beginning of the Paleozoic era about 541 million years ago. Therefore, the Precambrian is the oldest era (or supereon encompassing the oldest eras) listed. The Precambrian Supereon, comprising the Hadean, Archean, and Proterozoic Eons, represents the oldest and longest interval in Earth's geological history, preceding the Phanerozoic Eon and its subdivisions (Paleozoic, Mesozoic, Cenozoic Eras).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following is the oldest era in Geological History det\" \/>\n<meta property=\"og:description\" content=\"In the geological timescale, the largest division is the Eon. The history of the Earth is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons together are often informally referred to as the Precambrian Supereon, preceding the Phanerozoic. The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Precambrian represents the vast majority of Earth's history, from its formation about 4.5 billion years ago until the beginning of the Paleozoic era about 541 million years ago. Therefore, the Precambrian is the oldest era (or supereon encompassing the oldest eras) listed. The Precambrian Supereon, comprising the Hadean, Archean, and Proterozoic Eons, represents the oldest and longest interval in Earth's geological history, preceding the Phanerozoic Eon and its subdivisions (Paleozoic, Mesozoic, Cenozoic Eras).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:25:24+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following is the oldest era in Geological History det","description":"In the geological timescale, the largest division is the Eon. The history of the Earth is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons together are often informally referred to as the Precambrian Supereon, preceding the Phanerozoic. The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Precambrian represents the vast majority of Earth's history, from its formation about 4.5 billion years ago until the beginning of the Paleozoic era about 541 million years ago. Therefore, the Precambrian is the oldest era (or supereon encompassing the oldest eras) listed. The Precambrian Supereon, comprising the Hadean, Archean, and Proterozoic Eons, represents the oldest and longest interval in Earth's geological history, preceding the Phanerozoic Eon and its subdivisions (Paleozoic, Mesozoic, Cenozoic Eras).","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following is the oldest era in Geological History det","og_description":"In the geological timescale, the largest division is the Eon. The history of the Earth is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons together are often informally referred to as the Precambrian Supereon, preceding the Phanerozoic. 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The Precambrian Supereon, comprising the Hadean, Archean, and Proterozoic Eons, represents the oldest and longest interval in Earth's geological history, preceding the Phanerozoic Eon and its subdivisions (Paleozoic, Mesozoic, Cenozoic Eras).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:25:24+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-oldest-era-in-geological-history-det\/","name":"Which one of the following is the oldest era in Geological History det","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:25:24+00:00","dateModified":"2025-06-01T07:25:24+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"In the geological timescale, the largest division is the Eon. 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