<P> A drumlin, from the Irish word droimnín ("littlest ridge"), first recorded in 1833, and in the classical sense is an elongated hill in the shape of an inverted spoon or half - buried egg formed by glacial ice acting on underlying unconsolidated till or ground moraine . </P> <P> Drumlins occur in various shapes and sizes, including symmetrical (about the long axis), spindle, parabolic forms, together with transverse asymmetrical forms; their long axis is parallel to the direction of movement of the formative flow at the time of formation . </P> <P> Drumlins are typically 1 to 2 km (0.62--1.24 mi) long, less than 50 m (160 ft) high and between 300 to 600 metres (980--1,970 ft) wide . Drumlins generally have a length: width ratio of between 1: 2 and 1: 3.5, with the questionable assumption that more elongate forms correspond to faster ice motion . That is, since ice flows in laminar flow, the resistance to flow is frictional and depends on area of contact; elongate, subglacial landforms produced by ice would represent relatively slow flow rates . </P> <P> Drumlins and drumlin clusters are glacial landforms composed primarily of glacial till . They form near the margin of glacial systems, and within zones of fast flow deep within ice sheets, and are commonly found with other major glacially - formed features (including tunnel valleys, eskers, scours, and exposed bedrock erosion). </P>

What type of moraine forms inbetween two glaciers medial terminal ground lateral