GEOGCS["Unknown datum based upon the Plessis 1817 ellipsoid (deprecated)",DATUM["Not_specified_based_on_Plessis_1817_ellipsoid",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6027"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4027"]]