Pediatrics

Atlas of Sedimentary Rocks Under the Microscope by A.E. Adams

By A.E. Adams

Presents a truly transparent advisor to sedimentary rock forms as visible less than the microscope supported by means of sensible points of slide guidance.

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29 Terrigenous clastic rocks 68,69 Si ltstones Siltstones are those terrigenous sediments in which the majority of the grains are between 16 and 2� 6 mm in diameter (Table I , see p. 3). 68 and 69 show a coarse siltstone (notice that the magnification is higher than that of most of the previous photographs) with abundant quart£ grains and thin mica flakes. The micas include both muscovite (colourless) and biotite (yellow or brown). Muscovite is more abundant and shows second­ order interference colours.

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. The oysters arc one of the most important groups of calcitic bivalves.

Pcehlesliire. Scotland: magnific­ a tion x 43: 66 PPI 67 XPl •. •. 29 Terrigenous clastic rocks 68,69 Si ltstones Siltstones are those terrigenous sediments in which the majority of the grains are between 16 and 2� 6 mm in diameter (Table I , see p. 3). 68 and 69 show a coarse siltstone (notice that the magnification is higher than that of most of the previous photographs) with abundant quart£ grains and thin mica flakes. The micas include both muscovite (colourless) and biotite (yellow or brown).

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