 | Malthe Conrad Bruun - 1822 - 696 страници
...broken, and which had once been inhabited by marine animals. We are therefore led to consider chalk as a very ancient chemical decomposition of the altered and obliterated remains of shell-fish b. It is well known that the madrepores and other polypi of the equatorial seas, form chalk... | |
 | Conrad Malte-Brun - 1827 - 564 страници
...broken, and which had once been inhabitated by marine animals. We are therefore led to consider chalk as a very ancient chemical, decomposition of the altered and obliterated remains of shell-fish.* It is well known that the madrepores and other polypi of the equatorial seas, form chalk... | |
 | Conrad Malte-Brun - 1829 - 552 страници
...broken, and which had once been inhabitated by marine animals. \\e are therefore led to consider chalk as a very ancient chemical decomposition of the altered and obliterated remains, of .shell-fish.'- It is well known that the madrepores and other polypi of the equatorial seas, form chalk... | |
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Tile. | marls. It forms also vast beds in the state of chalk, frequently accompanied by large masses of calcareous shells compressed together, and broken, and which had once been inhabitated by marine animals. We are therefore led to consider chalk as... 