The chemical characteristics of interstitial water from cores from the inner and outer shelf off Long Island are compared with the overlying sea water. Cores from the inner shelf consist of clean sands, whereas those from the outer shelf contain a mud fraction. [Various chemical ratios are determined, as are the Eh-pH relations.] The decrease in pH and Eh below the water/sediment interface is attributed to the activity of anaerobic bacteria, and the reasons for other chemical changes are not known but are thought to result from diagenetic changes within the sediment.

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