What is the cross-code debut later than 1958 for Dick Thornett?
CREATE TABLE "australia" (
  "player" text,
  "test_debut" text,
  "year" real,
  "cross_code_debut" text,
  "date" text,
  "position" text
);
SELECT "cross_code_debut" FROM "australia" WHERE "year">1958 AND "player"='dick thornett';