Deep-Sea Fans - Trace Fossils as Indicators of Sedimentary Environments - page 644

tracts, and by their comparisons based on standardized data. Ichnological data
of deep-sea sediments from some periods are underrepresented. This is espe-
cially true for the Cambrian, Devonian, and the Late Carboniferous to Jurassic,
which have been studied only in a few places ( Uchman, 2004a ).
ACKNOWLEDGMENTS
A. U. was supported by the Jagiellonian University (DS funds). A. W. was supported by the
Swiss National Science Foundation (several grants). Tommy McCann (Bonn), Richard G.
Bromley (Copenhagen), and Dirk Knaust (Stavanger) provided helpful comments and
proposed many corrections.
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