The graveyard longwall foreman came off the face to find the top from 25' inby the belt tailpiece to approx. 40 outby had fallen. The fall was approx. 18"" thick and did not exceed the anchor point of the roof bolts. A horizontal shear had broken the bolts off. The seconary escapeway was blocked and production was interupted until 07/31/2005 at approx. 4:30/pm.