Abstract
The anomalous interstitial water chemistry in Puget Sound sediments (200‐m water depth) indicates an intermediate zone at 20‐ to 30‐cm depths which consists of a mixture of 90% interstitial water and 10% bottom water. Irrigation by burrowing benthic organisms is believed responsible. The vertical distribution of interstitial ammonia, nitrate, and nitrite indicates that nitrification is occurring in this intermediate sedimentary zone, with oxygen being supplied by the irrigation process. Above and below this zone denitrification predominates.
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