Digging at the dolomite dilemma.

Science News | November 30, 1985| | Copyright

In geology, the present is often the key to the past. One curious exception to this rule is dolomite, a magnesium-calcium carbonate (limestone). The "dolomite problem," as it has come to be called, arises from data collected earlier this century indicating that considerably more dolomite formed on the ancient earth than is forming today. Why this is so, and how the mineral is created, even in modern settings, are subjects of lengthy debate.

A new paper by David N. Lumsden at Memphis (Tenn.) State University presents the first measurements of dolomite deposited in ...

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