This is a result of the entire glacial water column at Cape Hatteras being characterized by relatively high δ 18 O of 4.4–4.7‰, whereas sites at Blake Outer Ridge exhibit a clear trend towards lower δ 18 O above about 2.5 km: δ 18 O is 4.5‰ at 2.5 km, 4.2‰ at 2.0 km, before gradually decreasing to roughly 3.8‰ at 1.0 km and then more sharply decreasing at shallower depths.
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