By A. E. Adams

Greater than 1/2 the world's petroleum is located in carbonate rocks, significantly within the center East, the previous USSR, and North the United States. those rocks exhibit a bewildering number of grains and textures, a result of wealth of alternative fossil organisms which give a contribution to their sedimentation and to the various diagenetic methods which alter textures and imprecise the unique deposits and upholstery. cautious petrographic examine with a polarizing microscope is a key point for learning carbonate sediments, as a comparability to box or middle logging, and as a precursor to geochemical research. This atlas illustrates in complete colour a number of positive factors of carbonate rocks and sediments, insurance way more broad than in any normal textbook. it really is designed as a pragmatic advisor for settling on grain varieties and textures in carbonates and may attraction alike to undergraduate and graduate scholars and to execs in either learn and business laboratories.

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Majewske (1969) includes an invaluable table summarising the shell mineralogy and struc­ ture of the major bivalve families. B io c la s t s 42 is a photograph of a Jurassic limestone and outlined by a thin dark line, probably a micrite shows four different bivalve shell structures. Dom­ envelope (p. 101). Unlike the two previously descri­ inating the left centre field of view is a transverse bed shells, this fragment does not have its original section of a shell with prismatic structure. Indi­ microstructure preserved.

I he boundary between the two layers would sediment is a fine peloidal and bioclastic limestone meet the inner wall of the shell in the palliai line. with detrital quartz grains. The wavy fragment in the upper right of the photo­ 51 Stained thin section, Upper Jurassic, England, PPL, x 17. 52 Unstained thin section, Jurassic, England, PPL, x 14. 38 B io c la s t s The rudisrs are a strange group of bivalves which become important in the Cretaceous. They include massive, bizarre forms where one valve was cemented to the substrate and a second acted as a Mid’.

Fox-,7· 49 C a r b o n a t e S e d im e n t s a n d R o c k s U n d e r t h e M ic ro s c o p e 76 is a high-magnification view of a pseudopuncrare shell. It shows well the laminated structure characteristic of the brachiopod shell and one of the calcite rods (taleolae) which fill the psetidopuncrae. The inner surface of rhe valve is towards the top of the photograph. 77 shows a rounded fragment of a pseudopunctate brachiopod with rhe disturb­ ances to the normal foliation, caused by rhe pseudo- punctae, clearly seen.

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