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

By A.E. Adams

Offers a truly transparent advisor to sedimentary rock kinds as obvious lower than the microscope supported through functional features of slide coaching.

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Centre of field of view). Partly-tilled moulds of bivalves can be �ecn outlined by thin micrite envelopes. These arc the elongate curved grains seen on the right-hand side of the photograph. 107: Stained thin section, Eocene, San Salvador, Majorca; magnification x 15. PPL. 108: Stained thin section, Eocene, Greece; magnific­ otion x 115. PPL. 109: Stained thin section, Upper Miocene, Ca/a Pi, Major('a; magnification x 27, PPL. 48 1 10, I l l Carbonate rocks B i o c l asts Foraminifera (continued) 110 shows a number of species of micrite-walled forams (cndothyracids).

PPL. , Stmtlwird. Sht'. Scotland: magnification x 14. PPI.. 89 Stained thin section. a/loll x 16. PPL. Triassic . Greece: magnific­ Other molluscs are shown in 105. 1 2 4 , 135. 136. 1 43, 156 (Ill(/ 159. 153, 41 Carbonate rocks 90, 91, 92 B i oc l asts B rachiopods The articulate brachiopods are important constituents of Palaeozoic and Mesozoic limestones. They were origin­ ally calcite and so their shell structures are weB-preserved. Typically, brachiopods have a thick inner layer of calcite fibres aligned with their length at a low angle to the shell wall.

The laminae being defined by changes in grain size. The dark layers, seen near the base of the photograph, arc composed almost entirely of clay-sized material, whereas the band just above the centre is composed of clear fine sand-sized quartz. The photograph also shows graded layers (below and above the coarse band). The fining-upwards grading is shown by a decrease in the clear quartz material and an increase in the dark-coloured clay. 71 shows a siltstone 111 which ripple cross-lamination can be seen.

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