Meanwhile, the glacier continues to recede, and numerous rills, still younger than the lake itself, bring down glacier-mud, sand-grains, and pebbles, giving rise to margin-rings and plats of soil.
(the glacier; continues; T:Meanwhile) (the glacier; to recede; ) (numerous rills, still younger than the lake; bring down; glacier-mud, sand-grains, and pebbles)
the glacier the glacier numerous rills, still younger than the lake
continues to recede bring down
T:Meanwhile
glacier-mud, sand-grains, and pebbles