Introductory Geology, a Text-Book for Colleges;
Introductory Geology, a Text-Book for Colleges;
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Digitized by Google DEEP-SEA DEPOSITS 199 they sink to the bottom and their secretions are mingled with the volcanic and other materials which are imiversal over the sea-floor.
Pelagic deposits of organic origin are named according to their characteristic constituents. Thus there are pteropod oozes, globi- gerina oozes, diatom oozes, radiolarian oozes, etc. Diatom ooze is an ooze in which the secretions of diatoms are abundant, and globigerina ooze is an ooze in which globigerina shells are abu...ndant, though in many cases the diatom and globigerina shells, respectively, do not make up the bulk of the ooze. • Between the various sorts of oozes there are all gradations, since pelagic life does not recognize boimdary lines.
It is a significant fact that with increasing depth the proportion of lime carbonate in the ooze decreases. Thus in tropical regions remote from land, where the depth is less than 600 fathoms, the carbonate of lime of the shells of pelagic organisms may constitute 80% or 90% of a deposit.
What to read after Introductory Geology, a Text-Book for Colleges;?
You can find similar books in the "Read Also" column, or choose other free books by Thomas C Thomas Chrowder Chamberlin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Digitized by Google DEEP-SEA DEPOSITS 199 they sink to the bottom and their secretions are mingled with the volcanic and other materials which are imiversal over the sea-floor.
Pelagic deposits of organic origin are named according to their characteristic constituents. Thus there are pteropod oozes, globi- gerina oozes, diatom oozes, radiolarian oozes, etc. Diatom ooze is an ooze in which the secretions of diatoms are abundant, and globigerina ooze is an ooze in which globigerina shells are abu...ndant, though in many cases the diatom and globigerina shells, respectively, do not make up the bulk of the ooze. • Between the various sorts of oozes there are all gradations, since pelagic life does not recognize boimdary lines.
It is a significant fact that with increasing depth the proportion of lime carbonate in the ooze decreases. Thus in tropical regions remote from land, where the depth is less than 600 fathoms, the carbonate of lime of the shells of pelagic organisms may constitute 80% or 90% of a deposit.
What to read after Introductory Geology, a Text-Book for Colleges;?
You can find similar books in the "Read Also" column, or choose other free books by Thomas C Thomas Chrowder Chamberlin to read onlineMoreLess
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