Carbonate cemented dunite breccia
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Fact sheet
Description: 

Darwin wrote: “Veins or beds of conglomerate; matrix and base the same.”

A good example of Darwin collecting a rock that was interesting rather than representative of the Island. This sample is a breccia of dunite and other fragments cemented together in a carbonate matrix. Large fragments of considerably altered dunite and shell fragments are cemented by a carbonate-rich pelletoid matrix.

In Place
In Time
Location description: 
Saint Paul's Rock, Atlantic Ocean, off the coast of Brazil
Accuracy:
Location precision: 
Moderate
Timescale:
Not known
Ma = Millions of years ago
In Focus
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Type:
Type: 
sedimentary
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