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===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 ([[:file:core-description_fig1.png|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 ([[:file:core-description_fig1.png|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===