Environmental Engineering Reference
In-Depth Information
fossils, trackways, imprints, and trails. All treated ichnogenera are listed
together with recent references for more detailed data. Even those ichnogen-
era regarded as invalid and not included in H¨ntzschel (1975) are listed with
references.
A critical review of all ichnogenera currently regarded as valid shows that
the number of ichnogenera erected after the last compilation of invertebrate
ichnogenera by H¨ntzschel (1975) has more than doubled and is now app-
roaching 600. Burrows are by far the largest subdivision of them (60%),
followed by bioerosional
trace fossils (17%),
trackways (14%),
imprints
(5%), and trails (4%).
This classification scheme is intended to serve as a solid basis for further
ichnotaxonomical work toward a more stable trace-fossil systematics. As a next
step, it could be the basis of a searchable online database in which further criteria
of ichnogenera may be regarded and filtered.
ACKNOWLEDGMENTS
I am indebted to Alfred Uchman (Krak ´ w) and Andrew K. Rindsberg (Livingston) for their
thorough review, and Ricardo N. Melchor (Santa Rosa) and Max Wisshak (Wilhelmshaven)
for valuable comments. Richard G. Bromley (Copenhagen) provided insightful suggestions
and comments that improved the chapter.
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