Changes

==Format for core logging==

==Format for core logging==

[[file:core-description_fig1.png|thumb|300px|{{figure number|1}}Idealized graphic log. Explanation for some symbols used for sedimentary structures, lithologies, fossils, and contacts are given. Grain size of sillclclastic rocks and Dunham's<ref name=pt05r50>Dunham, R. J., 1962, Classification of carbonate rocks according to depositional texture, in W. E. Ham, ed., Classification of Carbonate Rocks: AAPG Memoir 1, p. 108–121.</ref> classification of limestones are indicated in the column on the left. All sedimentary structures are depicted graphically as accurately as possible. Porosity amounts in percent can be scaled as needed. (Modified from Casey.<ref name=pt05r32>Casey, J. M., 1980, Depositional systems and basin evolution of the Late Paleozoic Taos trough, northern New Mexico: Ph. D. Dissertation, The University of Texas at Austin, 236 p.</ref><ref name=pt05r28 />.)]]

[[file:core-description_fig1.png|thumb|300px|{{figure number|1}}Idealized graphic log. Explanation for some symbols used for sedimentary structures, lithologies, fossils, and contacts are given. Grain size of sillclclastic rocks and Dunham's<ref name=pt05r50>Dunham, R. J., 1962, [http://archives.datapages.com/data/specpubs/carbona2/data/a038/a038/0001/0100/0108.htm Classification of carbonate rocks according to depositional texture], in W. E. Ham, ed., Classification of Carbonate Rocks: AAPG Memoir 1, p. 108–121.</ref> classification of limestones are indicated in the column on the left. All sedimentary structures are depicted graphically as accurately as possible. Porosity amounts in percent can be scaled as needed. (Modified from Casey.<ref name=pt05r32>Casey, J. M., 1980, Depositional systems and basin evolution of the Late Paleozoic Taos trough, northern New Mexico: Ph. D. Dissertation, The University of Texas at Austin, 236 p.</ref><ref name=pt05r28 />.)]]

A graphic log format, which visually expresses a stratigraphic succession, is strongly recommended for describing continuous cores. Such logs should reflect the following:

A graphic log format, which visually expresses a stratigraphic succession, is strongly recommended for describing continuous cores. Such logs should reflect the following:

* [[Porosity]]

* [[Porosity]]

Recommended formats for graphic logging are given by Bebout and Loucks<ref name=pt05r24>Bebout, D. G., Loucks, R. G., 1984, Handbook for Logging Carbonate Rocks: The University of Texas at Austin, Bureau of Economic Geology Handbook 5, 43 p.</ref> and Boyles et al.<ref name=pt05r28>Boyles, J. M., Scott, A. J., Rine, J. M., 1986, A logging form for graphic descriptions of core and outcrop: Journal of Sedimentary Petrology, v. 56, p. 567–568., 10., 1306/212F89DB-2B24-11D7-8648000102C1865D</ref> A completed graphic log is shown in [[:file:core-description_fig1.png|Figure 1]]. Grain size, sedimentary structures, and accessories are shown in the left column. Let's look at how each type of data is handled in the graphic log.

Recommended formats for graphic logging are given by Bebout and Loucks<ref name=pt05r24>Bebout, D. G., and R. G. Loucks, 1984, Handbook for Logging Carbonate Rocks: The University of Texas at Austin, Bureau of Economic Geology Handbook 5, 43 p.</ref> and Boyles et al.<ref name=pt05r28>Boyles, J. M., A. J. Scott, and J. M. Rine, 1986, A logging form for graphic descriptions of core and outcrop: Journal of Sedimentary Petrology, v. 56, p. 567–568., 10., 1306/212F89DB-2B24-11D7-8648000102C1865D</ref> A completed graphic log is shown in [[:file:core-description_fig1.png|Figure 1]]. Grain size, sedimentary structures, and accessories are shown in the left column. Let's look at how each type of data is handled in the graphic log.

===Grain size===

===Grain size===

===Sedimentary structures===

===Sedimentary structures===

Sedimentary structures are recorded to the right of and just inside the grain size curve. There is no single set of standardized symbols for sedimentary structures. Examples are given in Swanson<ref name=pt05r150>Swanson, B. F., 1981, A simple correlation between permeabilities and mercury [[capillary pressure]]s: Journal Petroleum Technology, v. 33, p. 2498–2504., 10., 2118/8234-PA</ref> and Bebout and Loucks.<ref name=pt05r24 /> Realistic sketches of observed structures may be more useful than standard symbols. The vertical succession of sedimentary structures should be recorded as accurately as possible because this succession is often the key to successful environmental interpretation. Description, classification, and interpretation of sedimentary structures are discussed by Collinson and Thompson<ref name=pt05r35>Collinson, J. D., Thompson, D. B., 1989, Sedimentary Structures: Boston, MA, Unwin Hyman, 207 p.</ref> and Lindholm.<ref name=pt05r103>Lindholm, R. C., 1987, A Practical Approach to Sedimentology: Boston, MA, Allen and Unwin, 276 p.</ref>

Sedimentary structures are recorded to the right of and just inside the grain size curve. There is no single set of standardized symbols for sedimentary structures. Examples are given in Swanson<ref name=pt05r150>Swanson, B. F., 1981, A simple correlation between permeabilities and mercury [[capillary pressure]]s: Journal Petroleum Technology, v. 33, p. 2498–2504., 10., 2118/8234-PA</ref> and Bebout and Loucks.<ref name=pt05r24 /> Realistic sketches of observed structures may be more useful than standard symbols. The vertical succession of sedimentary structures should be recorded as accurately as possible because this succession is often the key to successful environmental interpretation. Description, classification, and interpretation of sedimentary structures are discussed by Collinson and Thompson<ref name=pt05r35>Collinson, J. D., and B. D. Thompson, 1989, Sedimentary Structures: Boston, MA, Unwin Hyman, 207 p.</ref> and Lindholm.<ref name=pt05r103>Lindholm, R. C., 1987, A Practical Approach to Sedimentology: Boston, MA, Allen and Unwin, 276 p.</ref>

===Accessories===

===Accessories===