glacial erratics

glacial stratigraphy


kame terrace

outwash terraces

Till elsewhere in Scotland


east lothian



Till adjacent to the Geldie Burn. Subangular clasts of granite, quartzite and schist in a brown sandy matrix. The overlying till unit has much less granite debris, implying that the till stratigraphy here indicates two different phases of ice movement.


Definition: accumulations of unsorted, unstratified mixtures of clay, silt, sand, gravel, and boulders

Till occurs widely on the lower ground in and around the Cairngorms. In the core area of the Cairngorms, only granite debris occurs within the till and it can be difficult to distinguish from talus accumulations. Till, of course, is the major constituent of moraines.

Till is important because its content and structure provides evidence of the mode of formation of the associated glacial forms. The moraine ridges in Garbh Coire, for example, have been interpreted as slabs of frozen till thrusted within a cold-based valley glacier, based on analogies with similar forms in Spitzbergen (Bennett, 1996). Till is also of interest where it occurs within sequences of other sediments as it provide evidence of glacial conditions within the stratigraphy.