Unsorted sediments in the Carboniferous Kullatine formation, previously considered tillites, are here defined as subaqueous mudflows. The lensoidal nature of the beds, the general lack of lateral continuity, and the presence of large contorted masses of underlying sediments are the principal bases for the new definition. Grain-size distribution, roundness, sphericity, and composition of the tilloid and associated water-sorted sediments show striking similarities and support the concept of origin by mass movement.
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