The largest division of geological time, counting as two or more eras, and considered to cover a span involving a hundred million to a billion years or more
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Tag: <span>E</span>
A deposit of minerals influenced by the wind
The Eocene epoch was a period in time, thought to be 58-37 million years ago, when mammals first emerged
A report that examines the effects of mining on its natural environment
A rock with a water filled cavity
A geological process that originates from within the earth
A coating or deposit of minerals formed on the surface of matter
Where the lowest point of a river meets a larger, tidal body of water
A suspension of one liquid type in another
Shared held in trust until conditions of fulfillment are met