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(marine biodiversity, shelf, biotic radiation, Late Ordovician, Early Devonian)
early Late Ordovician?:A brief noteDMITRY A. RUBAN1Abstract. After the so-called “Cambrian explosion”, marine biodiversity peaked either in the early LateOrdovician (as shown by the “classical” curves based on the extensive

and the other extrinsic and intrinsic factors should be considered in further discussions.Key words: marine biodiversity, shelf, biotic radiation, Late Ordovician, Early Devonian.Апстракт. После тзв. ”камбријумске експлозије“

m the “back” side, i.e., with evaluation of conditions that were or were not able to sustain higher marine biodiversity in the early Late Ordovician and thelate Early Devonian. In the present note, the palaeoenvironments