Paragenesis results in characteristic speleogens that are found in caves developed under most climatic regimes. However, being a result of sediment excess in the karst conveyor system, it is also a characteristic of the glacier ice-contact (i.e. subglacial) regime. In this case, paragenetic galleries and passage half-tubes may be regarded as a continuation of subglacial esker systems. A unique feature of subglacial speleogenesis – and subglacial paragenesis – is topographically reversed flow from englacial hydraulic gradients superimposed onto adjacent karst.