Thank you for your suggestion of using Photo Merge. I have made a few attempts using different methods and am having some success. The first attempt failed spectacularly. I used all the images and ended up with a complete mess, In subseqent attempts I have only used a few images, each one from further down the pan. I'm having some success with that. There are some rough edges that will have to be cropped but it is yielding a complete image. I will post the final image. Thanks again