A Textbook of Geology

Cover A Textbook of Geology
A Textbook of Geology
Philip Lake
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The Microscopic Structure of Limestones. 2 Most of the fragments of calcareous organisms which go to build up limestones possess peculiarities of structure which enable us to assign them to their proper zoological position. The most important of them are Foraminifera, calcareous Algae, Corals, Echinoderms, Polyzoa, Brachiopods, Lamelli- branchs, Gastropods, and Cephalopods. Calcium carbonate possesses 1 Clement Reid, Brit. Assn. Rep. , 1895, p. 464.
2 Sorby, Presidential Address to the Geologic
...al Society, 1879, 14* A TEXT-BOOK OF GEOLOGY two distinct crystalline forms, calcite and aragonite, with differei. L physical properties. Aragonite is unstable under ordinary conditions, and is frequently either recrystallised as calcite or removed altogether by solution. Hence aragonite shells are often represented by mosaics of recrystallised calcite or by hollow spaces. In course of time the calcite of limestones also undergoes more or less recrystallisation, so that the original structure is often obscured ; and some limestones have been more or less completely recrystallised, or converted into marble, without the help of any metamorphic agencies.

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