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By A.E. Adams

Offers a really transparent consultant to sedimentary rock kinds as visible below the microscope supported via useful facets of slide instruction.

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Extra resources for Atlas of Sedimentary Rocks Under the Microscope

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R6 illustrates a section through a large thick-shelled ga�tropod. again preserved as a cast. 5 mm thick at this magnification. but the inner margm is only clear where sediment has partially filled the 1ntcrnal cavity. The sediment around the shell contains abundant �mall peloids. 84. I£'Ction. Eyam Limestone. Lower Carbo­ . \, Ricf.. low Quarry. tllion x 13. PPI-. Derbyshire, England: magnific­ 85: Stained 1/iin section. Upper Jurassic. D orset, England: ma�ni/iwtion x 14. PPL. 86: S111 ined ace/ale peel.

Chinodcrms. inc limestones. They arc easy to identify because they break down into plates which, although they may exhibit a wide variety of shapes, arc single calcite crystals with uniform extinction. They usually have a speckled or dusty ap­ pearance as the result of infilling of the fine pores which permeate the plates. 96 and 97 show a crinoidal limestone in which the �ed•mcnt is 75% crinoids. ote the speckled appearance of the plates. most of which have uniform interference colours and arc thus single crystals.

But the inner margm is only clear where sediment has partially filled the 1ntcrnal cavity. The sediment around the shell contains abundant �mall peloids. 84. I£'Ction. Eyam Limestone. Lower Carbo­ . \, Ricf.. low Quarry. tllion x 13. PPI-. Derbyshire, England: magnific­ 85: Stained 1/iin section. Upper Jurassic. D orset, England: ma�ni/iwtion x 14. PPL. 86: S111 ined ace/ale peel. Man in Limes/One, Lmrer Carbo­ niferous. Mil/om. Cumbria, England: magn(/ication x 7. P PI • . 40 87,88,89 Carbonate rocks B i ocl asts Molluscs (continued) The photographs on this page illustrate bivalves which were entirely or partly calcite.

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