{"thcode":2,"term":{"code":370,"name":"faunal and floral census (microscopic)","parent":619,"scope":"Records of counts of the different microscopic species in a core, soil, sediment, rock or water sample to determine geologic age or other characteristic of the sample.  Use for microscopic examinations."},"uf":[{"name":"pollen analysis","usewith":false}],"bt":[{"code":619,"name":"laboratory methods","parent":734,"scope":"Techniques to analyze and test samples in a place equipped and designed for the work."},{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":2278,"name":"environmental proxies","parent":734,"scope":"Biological, chemical, or physical features whose presence, characteristics, or behavior reflect environmental parameters of interest that cannot be readily or efficiently observed or measured directly."},{"code":375,"name":"field inventory and monitoring","parent":376,"scope":"Repeated observation or sampling at a site, on a scheduled or event basis, for study and analysis.  In general, this category excludes sampling programs in which materials are obtained in the field and brought back to a laboratory for study and analysis."},{"code":735,"name":"microbiology","parent":650,"scope":"Branch of biology dealing with organisms too small to be seen without the use of a microscope."},{"code":738,"name":"micropaleontology","parent":861,"scope":"Branch of paleontology dealing with fossils too small to be seen without a microscope."},{"code":740,"name":"microscopy","parent":619,"scope":"Laboratory methods using instruments that employ optical lenses or radiation to study objects too small to be seen by the naked eye."}]}