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
In the authors’ experience, students are surprised by the abundance and diversity of bryozoans in carbonate sediments and this seems to reflect the rather cursory treatment they receive in some palaeontology courses, perhaps partly because they are too large to be microfossils, but in most cases, paradoxically, too small to study easily without a microscope, and also because they are not usually of value biostratigraphically. Bryozoans exhibit a wide variety of growth forms, including flat encrusting, upright, tubular branching and fan-like forms with a reticulate structure.
The most common gastropod shell structure is a crossed-lamellar structure like that of some bivalves. 63 shows a transverse section through a Pleistocene gastropod which is still aragonite and in which the crossed lamellar structure is visible. 156). 63 Stained thin section, Quaternary, Morocco, PPL, × 30. 63 43 Carbonate Sediments and Rocks Under the Microscope Because of the metastability of the aragonite shell, most gastropods are preserved as moulds and casts. 64 and 65 show respectively transverse and longitudinal sections through Carboniferous gastropod casts.
95 and 96 are sections of the Silurian tabulate Favosites. In the low-magnification view (95), the corallite walls run vertically and the tabulae horizontally. The upper part of the colony is filled with sediment and the lower part with cement. 96 is an enlargement of the upper right part of the coral in 95 and it can be seen that the tabulae are very thin, appearing as little more than a dark line. The corallite walls have a similar dark line, but are fringed by a thin coating of clear calcite, in this case best seen in the upper part of the field of view where the chamber is filled with fine-grained sediment.
A colour atlas of carbonate sediments and rocks under the microscope by A E Adams; W S MacKenzie