This is a place where people can comment on the characteristics of what they view to be LIMESTONE.
...From weathered outcrop
To hill-top temple, from appearing waters to
Conspicuous fountains, from a wild to a formal vineyard,
Are ingenious but short steps that a child's wish
To receive more attention than his brother, whether
By pleasing or teasing, can easily take...
What I hear is the murmur of underground streams,
What I see is a limestone landscape.
W. H. Auden (1948)
A RECENT study of calcium carbonate, or CaCO3, provides important lessons
about the history of the Earth, since chalk, limestone and marble trace
their ROOTS to shallow water.
Thus, observation that large amounts of chalk deposits of the same age are
found on many continents led to the discovery that there existed a period
in which there was shallow water world-wide where shelled organisms
thrived. Some offer this as proof of the Biblical flood.
Nature returns the favor as calcium carbonate solutions from current
deposits provide living organisms today with the material they need to grow
their protective shells & skeletons. Eggshells, for example, are
composed of approximately 95% calcium carbonate.
Examples Etched in Limestone:I love the way limestone catches light, even on days when light is limited. The calcium in (sedimentary) limestone makes it water-soluble and easily eroded, yet limestone builds up over eons, one stratum at a time, out of organic matter.
Limestone takes on a life ALL its own. PLEASE ATTACH YOUR FAVORITE "CALCIUM CARBONATE IMAGES" HERE!!!