![](http://www.alamy.com/thumbs/6/63778D97-6DA8-4FCF-B22E-B89F968FEB32/F7PD8Y.jpg)
Limestone dated 350 million years old, showing deposits of calcite and other minerals.
Limestone dated 350 million years old, showing deposits of calcite and other minerals.
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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 350, ancient, archival, archive, bc, bce, calcite, dated, historical, history, limestone, million, mineral, minerals, natural, nature, stone, years