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": ""}
    _ 1999-05-11  SHERIDAN TWP. SEC. 18 1/4 [SIC] T15N, R7W ABOUT 5/8 MILESOU7H OF MADISON RD (SEC 7) ON A 2 TRACK E. OF HALFMOON LAKE ABOUT 3  MI SW OF BARRYTON ^ySM.    6:)UG MICHIGAN      marshall ,S;      STEPHEN ROSS fS         
{"catalogNumber": "", "order": "", "family": "", "scientificName": "", "scientificNameAuthorship": "Marshall", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Stephen Ross", "recordNumber": "", "verbatimEventDate": "1999-05-11", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Michigan", "county": "", "municipality": "", "locality": "Sheridan Twp. Sec. 18 1/4 [sic] T15N, R7W About 5/8 mile south of Madison Rd (sec 7) on a 2 track E. of Halfmoon Lake About 3 mi SW of Barryton", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}