By A E Adams; W S MacKenzie
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Extra info for A colour atlas of carbonate sediments and rocks under the microscope
These grains are lithoclasts of finegrained Triassic and Jurassic carbonates eroded and re-deposited during the Tertiary. A well-rounded quartz grain can be seen lower left, and in the top left-hand corner the edge of a basaltic volcanic fragment occurs. Since the fragments are of subaerially eroded material this limestone could be also be regarded as a terrigenous clastic sediment, in which case it would be classified as a coarse sandstone or litharenite. 41 41 Unstained thin section, Tertiary, Mallorca, Spain, PPL, × 30.
The shell fragment in 73 is also a punctate brachiopod and shows the small tubular pores cutting the shell wall. 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.
In fact this is a piece of Carboniferous Limestone that was eroded and re-deposited in a Lower Jurassic carbonate sediment. In 40 a lithoclast is cemented in a bioclastic grainstone. The grain must have been lithified at the time of reworking to allow the rounding of the echinoderm fragment seen at the left-hand end of the clast. It is also of a more carbonate mud-rich lithology than the grainstone in which it is now incorporated. 39 39 Stained thin section, Lower Jurassic, South Wales, PPL, × 34.