Abstract
It is often difficult to distinguishin situ material from exotic clasts in rock dredge hauls from deep ocean sites. A study of ice-rafted material in the northeast Atlantic Ocean has been undertaken for which a set of criteria has been established for the identification of glacial erratics. These criteria may be divided into two categories. The first is for criteria based on direct evidence visible on individual clasts, for example, striations and faceting. The second is for inferred evidence drawn from complete dredge hauls, for example, variations in the thickness of manganese coatings.
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