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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110 110 Stained thin section, Upper Jurassic, England, PPL, × 10.

In the left centre of the photograph is a fragment entirely of aragonite, and to the right is a fragment entirely made of calcite. 45 Stained thin section, Cretaceous, Isle of Skye, Scotland, PPL, × 45. 45 46 Thin section stained with Feigl’s Solution, Quaternary, Morocco, PPL, × 14. 46 35 Carbonate Sediments and Rocks Under the Microscope Crossed-lamellar structures are normally aragonite and comprise aggregates of branching lamellae which themselves are composed of small laths arranged at a constant angle to the lamellae.

42 Bioclasts 62 Unstained thin section, Triassic, Greece, PPL, × 40. Molluscs: Gastropods Gastropods are the second group of molluscs of major importance in limestones. Like the bivalves, they occur throughout the Phanerozoic, but are most abundant in Mesozoic and Cenozoic sediments. Gastropod shells are nearly all made wholly of aragonite, although there are a few with mixed 62 mineralogy, comprising an outer layer of calcite and an inner layer of aragonite. The most common gastropod shell structure is a crossed-lamellar structure like that of some bivalves.

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