This species is a clear example of Indirect intersexual selection.
Darwin distinguished between Intrasexual and intersexual sexual selection.
While Intrasexual selection happens when members of the same sex fight for mates, intersexual selection takes place when one sex selects the members of the opposite sex to mate with.
Interactions between a species' males and females lead to intersexual selection.
Males most often develop and exhibit features or behavioral patterns that appeal to the opposite sex.
Such characteristics include, for instance, a bird's plumage, a frog's mating cry, and a fish's courtship behavior.
Most limestones actually start as calcium carbonate mud or shells precipitated by organisms in reefs or shallow shelf regions - the biosphere. Over time, the limestone is broken down into its chemical parts and may come back to the surface as volcanic CO2 (in the atmosphere).
