Natural Puka Shell Formation
The shell of a cone snail is cone-shaped, and closed at the larger end. When the dead shell is rolled for a long time by the waves in the breaking surf and coral rubble, the narrow end of the shell breaks off or is gradually ground off, leaving only the more solid top of the shell intact.
Given enough time, the tip of the spire of the shell usually also wears down, and thus a natural hole is formed from one side to the other. This shell fragment can be considered to be a sort of a natural bead, and is known as a "puka". Real puka shells are not flat: one side of the bead is slightly convex, the other concave. The concave side of the bead clearly shows the spiral form of the interior of the spire of the cone shell.
Read more about this topic: Puka Shell
Famous quotes containing the words natural, shell and/or formation:
“All is changed. All looks strange to me and gives me a feeling which I would rather get away from, although I know it to be the carrying out of natural laws. And I am not complaining. I am doing the same as many old people have done, I suppose, who have led an active life and suddenly find themselves living without a purpose. Oh, my heart is so full. I could write a big book on the subject of going out of this world gracefully.”
—Maria D. Brown (1827–1927)
“Billy: You dropped some shell in there.
Ted: It’s all right. Makes it crunchier that way. You like French toast crunchy, don’t you?”
—Robert Benton (b. 1932)
“Those who were skillful in Anatomy among the Ancients, concluded from the outward and inward Make of an Human Body, that it was the Work of a Being transcendently Wise and Powerful. As the World grew more enlightened in this Art, their Discoveries gave them fresh Opportunities of admiring the Conduct of Providence in the Formation of an Human Body.”
—Joseph Addison (1672–1719)