By A E Adams; W S MacKenzie
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Additional info for A colour atlas of carbonate sediments and rocks under the microscope
The zooecia are filled with a mixture of sediment and non-ferroan (pink-stained) and ferroan (bluestained) calcite cements, and the colony is cut by some ferroan calcite-filled veins. 106 and 107 are sections of Silurian Bryozoans. bryozoans. 106 shows showsthick thicklaminated laminated walls walls and and internal internal partitions partitions within within thethe zooecia. The Thelower lowerpart part of of the colony in 107 shows that there are some circular structures within the zooecial walls.
In 59, however, although the shells are now made of coarsely crystalline calcite, some remnant of the original shell structure remains. This is best seen in the centre lower part of the photograph where lines of inclusions relating to the original laminated nature of the shell can be seen. This indicates that the original, presumably aragonite, shell did not completely dissolve leaving a void, but recrystallised in situ to calcite. 128). Other indications of neomorphism are the brown, inclusion-rich crystals in some parts of the shell fragments and the irregular-shaped crystals.
41 41 Unstained thin section, Tertiary, Mallorca, Spain, PPL, × 30. 31 BIOCLASTS Of all the components of limestones it is the great diversity of bioclasts which the student of carbonate sedimentology is likely to find most daunting. Not only can there be great variety in one thin section, but the bioclast content of limestones varies with age, such that, for example, a bioclast grainstone of Palaeozoic age, consisting perhaps of crinoid, brachiopod and bryzoan fragments will look very different from one of Tertiary age, dominated by large foraminiferans, coralline algae and mollusc fragments, even though they may have been deposited in similar environments.
A colour atlas of carbonate sediments and rocks under the microscope by A E Adams; W S MacKenzie