Add: Flour and till

[pbuttigieg]

Coming from #1, @sjskhalsa suggested the addition of flour and till as glacial abrasion products.

[rduerr]

Drift is the parent term describing all sedimentary deposits associated with glaciers, glacial meltwater and icebergs, regardless of the size or amount of sorting.

[Garybc]

So for more completeness we have material type differences and process differences (and maybe features made from them). Do we have Glacial drift as a sedimentary Glacial Deposit (nonstratified, non-sorted drift deposited directly from glacier ice) but others "deposits" like erratics (glacially_transported rock fragment different from the surface upon which it lies)?

Within the sedimentary do we have differences depending on the process of how they are deposited?
Till (material that is deposited directly by the ice) and Outwash – materials deposited by meltwater streams coming off a glacier.

A drift/deposit feature might be a moraine (an accumulation of drift built up chiefly by the direct action of ice?)