Dolomite

End-Permian extinction happened in 60,000 years—much faster than earlier estimates, study...

Dioptase

Angara River

Researchers Uncover New Species of Prehistoric Reptile

The dinosaurs’ demise up close

‘Steak-knife’ teeth reveal ecology of oldest land predators

Substance in photosynthesis was in play in ancient, methane-producing microbes

Diopside

Is there an ocean beneath our feet?

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