EMPLOYEE WAS PUSHING IN SHOT ALONG BESIDE ANOTHER DOZER AND THE OTHER DOZER PUSHED A ROCK OVER INTO HIS RUN AND EMPLOYEE BACKED OVER THE ROCK HURTING HIS SHOULDER AND NECK. EMPLOYEE DID NOT RE PORT THIS TO HIS FOREMAN UNTIL 2-28-04. EMPLOYEE DID NOT SEEK MEDICAL ATTENTION OR MISS WORK UNTIL 3-8-04.