Arthropod and mollusk traces in the varved clays of Central Poland

Abstract

Nine morphotypes are recognized among biogenic traces recorded in the varved deposits at Plecewice (Mazovia Lowland, Central Poland). Their formation is attributed to life activities of mollusks (pelecypods and gastropods) and arthropods. A comparison of the trace-bearing deposits from Plecewice to those Mazovian varved deposits devoid of biogenic, traces is sugestive of more favorable conditions for both organic life and trace preservation having been in distal and perhaps the external part of intermediate zone than in proximal zone of varve sedimentation.