Answer :
The thick sequence of limestone units beneath the Esplanade sandstone was likely deposited through a process known as sedimentation.
Limestone is primarily formed from the accumulation of marine organisms' skeletal remains, similar as coral, shellfish, and microorganisms with calcium carbonate shells, over long ages of time. These organisms prize calcium and carbonate ions from seawater to build their shells and skeletons. As they die, their remains settle on the ocean bottom and suffer contraction and cementation, transforming into limestone.
The presence of the limestone units suggests that the area was formerly submerged in a marine terrain conducive to the growth and deposition of these organisms.
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The correct question is:
What is the nature of the deposition of the thick sequence of limestone units located beneath the esplanade sandstone?
