The physical geography of New York state . >1tt/ 117 thus deposited from the ice was not definitely assorted, butwas made of clay, sand, pebbles and boulders mixed in-discriminately together, for the ice was able to carry alarge boulder as well as a bit of clay, a fact which is nottrue of water under ordinary conditions. These depositsfrom the glacier form the characteristic soil of New York,particularly of the hillsides and hilltops, and, in places, ofthe valley bottoms also. This glacial soil is known as tillor boulder day (Fig. 35). Thus it happens that a farm inone part may be bouldery
The physical geography of New York state . >1tt/ 117 thus deposited from the ice was not definitely assorted, butwas made of clay, sand, pebbles and boulders mixed in-discriminately together, for the ice was able to carry alarge boulder as well as a bit of clay, a fact which is nottrue of water under ordinary conditions. These depositsfrom the glacier form the characteristic soil of New York,particularly of the hillsides and hilltops, and, in places, ofthe valley bottoms also. This glacial soil is known as tillor boulder day (Fig. 35). Thus it happens that a farm inone part may be bouldery and clayey, in another partclayey without boulders, and still elsewhere either sand orgravel. In each of these cases there was a cause, which,. FIG. 61. Near view of a cut in glacial till, gullied by the rains and with numeroustransported pebbles embedded in the rock flour. by careful study, can often be determined, though sonic-times this is impossible because of the complexity ofconditions attending the withdrawal of the ice, the fullevidence of which is sometimes lacking. With the withdrawal of the ice the conditions wereagain made favorable for the existence1 of animal andplant life upon the surface. Foot by foot the country wasrelieved of its ice blanket, and slowly the soil left by the 118 The Physical Geography of New York State glacier began to be made to nourish plant life and tofurnish a dwelling place for animals. At first, skirting theice front, there must have been strips of land entirelywithout vegetation. Then came the light-seeded grasses
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