Refactor the unstructured text into a valid JSON dictionary. The key names follow the Darwin Core Archive Standard. If a key lacks content, then insert an empty string. Fill in the following JSON structure as required: {"catalogNumber": "", "order": "", "family": "", "scientificName": "", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}
             s.n. <     o Marshall  1838-07-12 z   first geological survey of michigan, 1837â1840, douglass houghton, state geologst; abram sager, botanist and zoologist, 1837; john wright, state botani st,  1838, assisted by george h. bull[the ink label is in the hand of may v. c4nnon, herbarium assistant ca. 1920] ; coordinates arbit3rarily placed at jct. michigan ave. & francis st.] [na0080926] FT   FRAXINUS NIGRA `X     
{"catalogNumber": "", "order": "", "family": "", "scientificName": "Fraxinus nigra", "scientificNameAuthorship": "Marshall", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "s.n.", "verbatimEventDate": "1838-07-12", "habitat": "", "occurrenceRemarks": "First Geological Survey of Michigan, 1837\u00e2\u0080\u00931840, Douglass Houghton, State Geologist; Abram Sager, Botanist and Zoologist, 1837; John Wright, State Botanist, 1838, assisted by George H. Bull[The ink label is in the hand of May V. Cannon, herbarium assistant ca. 1920] ; Coordinates arbitrarily placed at Jct. Michigan Ave. & Francis St.] [NA0080926]", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}