A colour atlas of carbonate sediments and rocks under the by A E Adams; W S MacKenzie

By A E Adams; W S MacKenzie

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74 is a close-up of the wall of an impunctate brachiopod, with a fairly thick shell made of fine fibres aligned at a low angle to the shell wall. 101), with some destruction of the shell by micro-borings. 75 shows a ribbed impunctate brachiopod encrusted on its upper surface by a bryozoan. 72 72 Stained thin section, Middle Jurassic, Palencia, Spain, PPL, × 30. 48 Bioclasts 73 Stained thin section, Middle Jurassic, England, PPL, × 35. 73 74 Stained thin section, Lower Carboniferous, South Wales, PPL, × 38.

In the upper part of the fragment, pores within the wall are filled with micritic sediment. 54 shows a rudist with a coarsely porous (‘vesicular’) wall. Parts of the wall are outlined by a thin, dark micrite coating and the pores are filled with sparite cement. The structure of the wall is not really evident in the photograph, but is, at least in part, prismatic. 53 Unstained thin section, Lower Cretaceous, Middle East, PPL, × 18. 53 54 Stained thin section, Lower Cretaceous, Istrian Peninsula, PPL, × 17.

110 is an encrusting bryozoan, but the material encrusted has been completely replaced by calcite. In fact, the bryozoan was encrusting a scleractinian coral colony, but since the latter was aragonite, it has been dissolved, leaving a void to be later filled with mauve-stained ferroan calcite cement, whereas the bryozoan, made of calcite, did not dissolve. The colony is surrounded by carbonate mud. 109 109 Stained thin section, Middle Jurassic, England, PPL, × 17. 110 110 Stained thin section, Upper Jurassic, England, PPL, × 10.

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