Investigation on the solid bitumen/oil shale in the Ayah area is to study the solid bitumen-bearing formation defosits. The area is in the Ayah District, Kebumen regency, Central Java Provice. Geographically, the location in bounded by lattitudes 07derajat 30'00"-07derajat 45'00" South and longitudes 109derajat 15'00"-109derajat 30'00" East.