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Updated: May 13, 2025
The live part of the reef is just where the breakers come in and beyond. The gelatinous rock-building polypifers die almost at once, if exposed to the sun or if left uncovered by water.
The history of the discovery of these living Globigerinæ, and of the part which they play in rock-building, is singular enough. It is a discovery which, like others of no less scientific importance, has arisen, incidentally, out of work devoted to very different and exceedingly practical interests.
Two hundred carbon-lines were, through his comparisons, sifted out from sunlight, and it contains others significant of the presence of silicon a related substance, and one as important to rock-building on the earth, as carbon is to the maintenance of life.
As a general rule, however, the various sorts of rock-building have probably gone on together. This was not so well understood by early geologists as it is now. The difficulty is often great of disentangling the different strata, and saying which was earlier and which later formed.
If we can learn what it is and what are the conditions of its existence, we shall see our way to the origin and past history of the chalk. The history of the discovery of these living Globigerinæ, and of the part which they play in rock-building, is singular enough.
The history of the discovery of these living Globigerinæ, and of the part which they play in rock-building, is singular enough. It is a discovery which, like others of no less scientific importance, has arisen, incidentally, out of work devoted to very different and exceedingly practical interests.
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