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some surfaces may be original fracture planes.
:*Great size - the size distribution of the boulders tends to be skewed toward larger boulders than those produced subglacially.
:*Surficial positioning of the boulders - the boulders are positioned on the surface of glacial deposits, as opposed to partially or totally buried.
:*Restricted areal extents - the boulder fields tend to have limited areal extent; the boulders cluster together, consistent with the boulders landing on the surface of the glacier and subsequently deposited

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