Even south of this, climate much cooler during peak of glaciation. 2. recolonization of terrain north of glacial terminus. Some species have not yet fully reached climatic range limits. Glaciated terrain has extensive glacial deposits, affects nature of substrates. Rapid drainage, upland soils droughty.
Sands are nutrient poor.
Do not retain many nutrients. C. Fires are common, due to dry soils. Pines favored over broadleaf trees on dry, infertile soils. Fires keep sites open, lots of light for grasses in understory. Lots more clay in soil.