Meltwater
...etched a "notch" or ridge into the preexisting landscape. Today, the flat lake plains of the Thumb and Monroe areas have numerous beach ridges, which are often marked by sandy soils. Much of the Detroit area is built on a flat, wet lake plain; in such a landscape the few dry, sandy beach ridges were preferred sites of settlement.The membership of SCAR comprises the appropriate bodies of those national scientific academies or research councils which are the adhering bodies to ICSU and which are, or plan to be, active in Antarctic research, together with the relevant scientific Unions of ICSU. It includes the original twelve members and an increasing number of subsequent members. There are three categories of membership: Full Members, ICSU scientific unions members and Associate Members. Full Members are those countries with active scientific research programme in Antarctica, currently 2...