WITSML - Lithology Component Schema The type of lithology. Lithology official codes if desired. Operator typically to define what the codes are. The lithology represents what portion of the sampled interval. The total of the lithologies within an interval should add up to 100 percent. The "undifferentiated" code should be used to fill out to 100. Description of item and details. Lithology classification description. Granulometry. Dunham limestone classification. Lithology color description. Lithology texture description. Lithology hardness description. Lithology grain size description. Lithology roundness description. Lithology sorting description. Lithology matrix/cement description. Lithology visible porosity description. Lithology permeability description. Shale density for the interval. A single qualifier. In mudlogging terms, a qualifier is a graphical symbol in the Interpreted Lithology column of the Formation Evaluation Log (aka "the mudlog"). In addition to the major lithologies (e.g., sand, shale, etc) existing in the sample, other minerals (present as accessories or inclusions e.g. chert, pyrite, glauconite) and fossils (forams, oyster shells, bryozoans, etc) may exist and their abundance is generally categorized using ranges such as Trace (less than 10%), Common (10-25%) and Abundant (greater than 25%). These additional minerals and fossils can be of disproportionately great diagnostic and descriptive value. For example, qualifiers can be used to indicate facies changes, marker beds or something that impacted drilling conditions. These qualifiers (representing accessories, inclusions and/or fossils) are used to rapidly and graphically indicate to the recipient of the mudlog that a significant lithological event was encountered while drilling the well. Unique identifier for the lithology object.