Abstract
Abstract Two lenses of limited lateral extent, each c. 20 cm thick, in a nonmarine sequence on the Mataura River, Southland, contain a high proportion of chamosite and siderite. The siderite is in the form of small spherules resembling the Eocene foraminifera Globigerapsis index. A Late Oligocene or Early Miocene palynoflora immediately below the lenses conflicts with an Eocene age, and it is proposed that the siderite bas replaced foraminifera redeposited from eroding Eocene strata not now exposed in the area. Bulk chemical analysis of the lens gives 49.4% FeO, and electron probe analyses of siderite and chamosite are given.
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