{"thcode":2,"term":{"code":569,"name":"ichnofossils","parent":414,"scope":"Fossilized remains of the traces of animal activity from different geologic time periods including burrows, tracks, trails, borings, and other features found in sedimentary structures."},"uf":[{"name":"trace fossils","usewith":false}],"bt":[{"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":1005,"name":"rocks and deposits","parent":287,"scope":"Solid masses that make up the earth's crust as well as accumulations of materials. Use for major rock types and unconsolidated deposits. For deposits of economic value, see related terms."},{"code":287,"name":"earth characteristics","parent":1174,"scope":"The measurable, definable properties and features of the earth."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"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":115,"name":"biostratigraphy","parent":1104,"scope":"Branch of geology concerned with the separation and differentiation of rock units based on the fossils they contain."},{"code":861,"name":"paleontology","parent":291,"scope":"Study of life in past geologic time based on fossil plants and animals."}]}