SAND n.
y to other allied species. -- Sand darter (Zoöl.), a small etheostomoid fish of the Ohio valley (Ammocrypta pellucida). -- Sand dollar (Zoöl.), any one of several species of small flat circular sea urchins, which live on sandy bottoms, especially Echinarachnius parma of the American coast. -- Sand drift, drifting sa…
TILL n.
A deposit of clay, sand, and gravel, without lamination, formed in a glacier valley by means of the waters derived from the melting glaciers; -- sometimes applied to alluvium of an upper river terrace, when not laminated, and appearing as if formed in the same manner.