List I - Sedimentary rocks
These thesaurus lists, lists A-R, are used by GeoRef indexers for selecting index terms and by searchers for additional information not necessarily found in individual term records in the body of the Thesaurus. In most cases, an hierarchical list is given. In some cases, an alphabetical or other list is provided.
The notes under Searching attempt to guide the searcher in the use of the list. Searchers might also read the notes on Indexing for further clues but should be aware that these notes reflect current practice which in some cases differs from past practice. Further notes on specific terms are in the body of the Thesaurus and additional notes on searching are in the GeoRef Thesaurus, 11th edition Introduction section on searching beginning on page x. Information specific to searching and the individual list topics is included, e.g., a section including sedimentary rocks begins on page xii.
The term sedimentary petrology may be used in papers pertaining to the discipline, such as papers on techniques, methods, etc.
Where the process sedimentation is stressed, it is also used.
For specific searches on a certain rock, use the rock name, in variant forms to include singular and plural forms. For an exhaustive search use all major groups and the general term sedimentary rocks.
Search only the general term sedimentary rocks if only papers which have sedimentary rocks as the major topic are desired. For more information see the specific rock names in the body of the Thesaurus. For sedimentary rocks which are commodities see List C-1.
Related topics such as sedimentation, sedimentary structures, sediments, and diagenesis can be searched separately.
Index the most specific term from the alphabetical list. If the term does not appear in the list, add it in the singular, and index a higher level term that appears on the list.