and uranpyrochlore from tuff near Ndale, Fort Portal area, Uganda D: D. HOGARTH Department of Geology...fiat-lying, Recent, calcite-rich tuff at Ndale near Fort Portal, Uganda, unconformably overlies steeply dipping...(4000-5000 yr) geological age. KEVWORDS: Fort Portal, Ndale, Uganda, tuff, pyrochlore, uranpyrochlore, uranium...radioactivity. Introduction A pyrochlore-group mineral from Ndale was tentatively identified as 'betafite' by Newman...one of us (Hogarth, in press), the problem of the Ndale, non-metamict 'betafite' was reconsidered, and because |