By Maurice E. Tucker

A realistic quantity that describes how the beneficial properties of sedimentary rocks will be recorded within the box, rather throughout the building of image logs. Discusses such specific elements of sedimentary rocks as lithology, texture, sedimentary buildings, fossils and paleocurrents, with emphasis on what beneficial properties to appear for and the way to degree and verify them for later environmental and method interpretation of facies, facies sequences, and facies institutions.

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In the field, use a handlens to see the cause of the lamination; is it a fine intercalation of different lithologies or a grain-size change or both? If in a sandstone, split the rock and look for parting lineation on bedding surface~. 4). Measure the average thickness of laminae and the thickness of the parallel-laminated unit. 2 Ripples, dunes and sand waves These are bedfonns developed chiefly in sand-sized sediments. Ripples are common and occur on bedding surfaces, but the larger-scale dunes and sand waves are rarely preserved.

Beds are typically normally graded, can be reworked by currents and waves if deposited in water, or wind if subaerial, and thus may show cross or planar lamination. These deposits can be spread 34 oyer wide areas and be used for stratigraphic correlation. Volcaniclastic flow deposits mos y occur in subaerial situations. Ignimbrites are characterized by an homogeneous appearance with little sorting of the finer ash particles. Coarse lithic clasts may show normal grading and large pumice clasts reverse grading.

Finely-disseminated pyrite also gives rise to a dark colour. SOFTbank E-Book Center Tehran, Phone: 66403879,66493070 For Educational Use. 42 Other colours such as olive and yeUow can result from a mixing of the colour components. Other minerals with a particular colour in sediments are glauconite and cbamosite; they are green. • • 43 SOFTbank E-Book Center Tehran, Phone: 66403879,66493070 For Educational Use. 1 Introduction Sedimentary structures are an important attribute of sedimentary rocks.

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