{"thcode":2,"term":{"code":738,"name":"micropaleontology","parent":861,"scope":"Branch of paleontology dealing with fossils too small to be seen without a microscope."},"uf":[],"bt":[{"code":861,"name":"paleontology","parent":291,"scope":"Study of life in past geologic time based on fossil plants and animals."},{"code":291,"name":"earth sciences","parent":1019,"scope":"Broad term for all science related to the study of the earth."},{"code":1019,"name":"sciences","parent":1,"scope":"Major educational fields, fields of study, and professional groupings within 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":138,"name":"calcareous nannoplankton","parent":29,"scope":"Organisms of the kingdom Protista that normally produce coccoliths, microscopic structures of calcite (calcium carbonate), during some phase of their life cycle."},{"code":192,"name":"conodonts","parent":606,"scope":"Microscopic teeth of primitive, boneless, eel-like animals, similar to modern hagfish, that lived in many of the world's oceans from the Cambrian through Triassic Periods of geologic time (550 to 210 million years ago)."},{"code":250,"name":"diatoms","parent":29,"scope":"Microscopic, single-celled plants of the class Bacillariophyceae that have siliceous shells called frustules, and which grow in both marine and fresh water."},{"code":261,"name":"dinoflagellates","parent":29,"scope":"Single-celled planktonic organisms, chiefly marine, characterized by twirling motion and whip-like flagella with affinities to both plants and animals."},{"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."},{"code":414,"name":"fossils","parent":1005,"scope":"Recognizable remains such as bones, shells, leaves, burrows, impressions, or tracks of past life on the earth."},{"code":940,"name":"protists","parent":843,"scope":"Unicellular eukaryotes (organisms possessing nucleated cells) with affinities to both plants and animals. Classed in the Protista or Potoctista kingdom, they include protozoans, foraminifera, radiolarians, fungi and some algae."}]}