Tagasi otsingusse
Hiller, 1993

A modern analogue for the Lower Ordovician Obolus conglomerate of Estonia

Hiller, N.
DOI
DOI10.1017/S0016756800009912
Aasta1993
AjakiriGeological Magazine
Köide130
Number2
Leheküljed265-267
Tüüpartikkel ajakirjas
Keelinglise
Id3171

Abstrakt

Phosphate-bearing rocks of the lower Ordovician Kallavere Formation, northern Estonia, contain diverse fragments and, more rarely, complete shells of the phosphatic inarticulate brachiopods Schmidtites and Ungula. In places the concentration of brachiopod debris in sandstones is so dense that economically exploitable seams of phosphorite are formed. A directly analogous situation occurs along the coast of Namibia today. In places the extant phosphatic inarticulate brachiopod Discinisca is washed up on the beach in such large numbers that its shells dominate the littoral sediment. The distribution range of this species suggests that it is a product of the Benguela upwelling ecosystem, and the inference is drawn that the Estonian deposits are the products of a similar palaeo-upwelling system.

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