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Marmorization of chalk beds by basalt. Island of Rathlin on coast of Antrim, Ireland.

Marmorization of Chalk Beds

Marmorization of chalk beds by basalt. Island of Rathlin on coast of Antrim, Ireland.

Section of volcanic plug (basalt) in chalk. Coast of Antrim, Ireland.

Volcanic Plug

Section of volcanic plug (basalt) in chalk. Coast of Antrim, Ireland.