Image #JHN-10: Soil profile at the Gap Forest sub-site, John Crow Ridge tropical forest site, Jamaica. (In the upper part of the profile, note the absence of mor humus, and relatively little dark brown staining by mull humus, compared to Mor Ridge soil and Mull ridge soil, respectively. This is despite the fact that total litterfall rates are rather similar at all three sub-sites [661 g/m2/yr Mor; 554-580 g/m2/yr Mull; 647 g/m2/yr Gap Forest]. Scale pole divisions are 12 inches [305 mm]. Photograph taken February 1975 by Dr. E.V.J. Tanner, Cambridge University, UK).