Geologic Time - Precambrian Period
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Questions and Answers

What are the three parts that the Precambrian Eon was broken into?

Hadean, Archean, Proterozoic

When did the Hadean Eon begin and end?

Began 4.6 billion years ago, ended 4 billion years ago

Who coined the term 'Hadean' and when?

Geologist Preston Cloud in 1972

What were Hadean rocks largely consisting of?

<p>Granular zircons from one locality in Western Australia</p> Signup and view all the answers

What did the Earth's atmosphere contain during the Archean period?

<p>Methane with little to no oxygen</p> Signup and view all the answers

What did the early Earth's atmosphere contain during the Hadean period?

<p>Carbon dioxide and methane</p> Signup and view all the answers

During which era did the oxygen level of Earth reach 3%, leading to the rise of multicellular organisms?

<p>Proterozoic Era</p> Signup and view all the answers

What are the three geologic eras that the Proterozoic Era is subdivided into?

<p>Paleoproterozoic, Mesoproterozoic, Neoproterozoic</p> Signup and view all the answers

What is the Phanerozoic Eon known as?

<p>Eon of visible life</p> Signup and view all the answers

How many parts is the Phanerozoic Eon broken into?

<p>Three</p> Signup and view all the answers

What marks the beginning of the Paleozoic Era?

<p>Cambrian explosion</p> Signup and view all the answers

What was formed during the middle Paleozoic Era?

<p>Marine life forms with shells</p> Signup and view all the answers

What began to appear during the late Paleozoic Era?

<p>Reptiles</p> Signup and view all the answers

What is the Mesozoic Era also known as?

<p>Age of Reptiles</p> Signup and view all the answers

Who introduced the phrase 'Age of Reptiles'?

<p>Gideon Mantell</p> Signup and view all the answers

What started to break apart during the Mesozoic Era?

<p>Pangaea</p> Signup and view all the answers

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