This sketch, made with the page turned horizontally, was used as the basis for a watercolour design for the Oxford Almanack (Ashmolean Museum, Oxford),1 engraved in 1808 (no Tate impression).
There are extensive colour tests on the verso (D41466).
Andrew Wilton, J.M.W. Turner: His Life and Work, Fribourg 1979, p.334 no.302, reproduced.
For a proposed sequence for the leaves of the disbound Fonthill sketchbook, with this page as folio 3, see the Introduction.