Changes

===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., 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>.

===Accessories===

===Accessories===

===Thickness===

===Thickness===

Thicknesses are recorded in the column labeled “Interval.” A scale showing sufficient details of sedimentary structures and accessories for inferring environments is necessary. Boyles et al.)<ref name=pt05r28 /> suggest that the smallest feature shown should be approximately 0.05 in. (1.3 mm) high. Usually a scale of 1 in. = 5 or [[length::10 ft]] is appropriate.

Thicknesses are recorded in the column labeled “Interval.” A scale showing sufficient details of sedimentary structures and accessories for inferring environments is necessary. Boyles et al.<ref name=pt05r28 /> suggested that the smallest feature shown should be approximately [[length::0.05 in]] (1.3 mm) high. Usually a scale of [[length::1 in]] = [[length::5 ft]] or [[length::10 ft]] is appropriate.

===Lithology===

===Lithology===

Dominant lithologies and the nature of the contact between lithologic units are recorded in the “Rock Type and Contacts” column near the middle of a graphic log (Figure 1). Standardized symbols for illustrating lithologies are available and are presented by Tucker.<ref name=pt05r157>Tucker, M. E., 1982, The Field Description of Sedimentary Rocks: United Kingdom, The Open University Press, 112 p.</ref> and Lindholm)<ref name=pt05r103 /> If more than one lithology or interbedded lithologies exist within an interval, lithologies should be logged by estimating the percent volume of each lithology and noting the terrigenous clastic lithologies to the left of the chemical rocks. Contacts between lithologies are recognized in core as gradational, interbedded, or sharp. Some sharp contacts are probably erosional and may represent unconformity surfaces. Additional information such as the presence of root structures and early diagenetic cements may aid in determining the true nature of sharp contacts.

Dominant lithologies and the nature of the contact between lithologic units are recorded in the “Rock Type and Contacts” column near the middle of a graphic log (Figure 1). Standardized symbols for illustrating lithologies are available and are presented by Tucker.<ref name=pt05r157>Tucker, M. E., 1982, The Field Description of Sedimentary Rocks: United Kingdom, The Open University Press, 112 p.</ref> and Lindholm<ref name=pt05r103 /> If more than one lithology or interbedded lithologies exist within an interval, lithologies should be logged by estimating the percent volume of each lithology and noting the terrigenous clastic lithologies to the left of the chemical rocks. Contacts between lithologies are recognized in core as gradational, interbedded, or sharp. Some sharp contacts are probably erosional and may represent unconformity surfaces. Additional information such as the presence of root structures and early diagenetic cements may aid in determining the true nature of sharp contacts.

===Maturity===

===Maturity===