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In a glacier environment, large particles have greater durability. These large fragments have the ability to sustain higher pressure without cracking and can survive collisions without breaking into pieces. It also takes a longer distance of transportation to abrade boulders because of the presence of a larger surface area. For example, in a distance of 5 meters, boulders with a mean axis of 2 meters can be rolled over only once when a pebble of a diameter of 20 mm can be rolled around 100 times. This should explain why small particles grind up faster than boulders.

According to Drake’s (1972) study, pebbles reach a mean roundness of 0.5 in 1 mile of transportation. Based on the study of boulders from Stony Brook, boulders do not reach this degree of roundness in 15 to 20 miles of transportation. Sand, on the other hand, reaches its mean roundness of 0.5 in a distance shorter than one mile. It is very unlikely to find angular sand.

Based on a mean roundness of 0.5, there is a relationship of the mean size of the particles and the distance of transportation of these particles in a glacier (fig. 3). After the mean roundness of 0.5 is reached, the mean roundness of 0.5 is sustained through the whole process of transportation of these types of particles due to existence of dynamic equilibrium between breakage and roundness. The point where the mean roundness of 0.5 is reached by the specific size of studied lithology can be used for the estimation of the distance to the source of the rocks. The studied size of the particle will just reach its 0.5 equilibrium if the majority of particles will still have a roundness number less than 0.5, like granite A in table 5. In using the graph (fig, 3) for estimating the distance of transportation, the best results will give study of the same lithology in the size of pebbles, cobbles, and boulders. Also, the graphs should be made for each different lithology separately. The durability of dolomite is much different than the durability of igneous rocks.

Studies of the distribution and sources of rock types, suggest that most boulder size rocks at the base of a glacier travel only some 20 miles before they are destroyed by crushing and abrasion. This does not mean that some boulders did not travel much further. It is just means that if there is a con-tinuous source of boulders in a glaciers path, those boulders that traveled a longer distance make up only a small percentage of the boulders. Also not all boulders travel at the base of the glacier. Some may be placed in the ice above the base and as a result are transported with little crushing or abra-sion. An analysis of boulders on the Stony Brook University campus suggests that while some of these boulders may have traveled some 30 to 40 miles from their source (Pacholik, 1999), many came from the basement rocks underlying Long Island Sound. The closest place that basement rocks would have been exposed during glaciation is about 6 miles to the north. Introduction Studies of the distribution and sources of rock types, suggest that most boulder size rocks at the base of a glacier travel only some 20 miles before they are destroyed by crushing and abrasion. This does not mean that some boulders did not travel much further. It is just means that if there is a con-tinuous source of boulders in a glaciers path, those boulders that traveled a longer distance make up only a small percentage of the boulders. Also not all boulders travel at the base of the glacier. Some may be placed in the ice above the base and as a result are transported with little crushing or abrasion. An analysis of boulders on the Stony Brook University campus suggests that while some of these boulders may have traveled some 30 to 40 miles from their source (Pacholik, 1999), many came from the basement rocks underlying Long Island Sound. The closest place that basement rocks would have been exposed during glaciation is about 6 miles to the north.