Australian Shield

Basic geological regions of Australia, by age.

The Australian Shield, also called the Western Australian Shield or Western Plateau, occupies more than half of the continent of Australia. The word shield is used because it refers to ancient, molten rock which has cooled and solidified. The Australian Shield has a characteristic depth of 4.5 km and an estimated age of 2.8 to 3.5 billion years. In places younger sedimentary rock covers the shield's Precambrian surface.

单词	Australian Shield
释义	Australian Shield 英语百科 Australian Shield The Australian Shield, also called the Western Australian Shield or Western Plateau, occupies more than half of the continent of Australia. The word shield is used because it refers to ancient, molten rock which has cooled and solidified. The Australian Shield has a characteristic depth of 4.5 km and an estimated age of 2.8 to 3.5 billion years. In places younger sedimentary rock covers the shield's Precambrian surface.
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