Columbia subject headings:
Paleoecology.
Sedimentary structures.
Sedimentation and deposition.
Trace fossils.
Harvard subject headings:
Sedimentary rocks--Congresses
Sedimentary structures--Congresses.
Sedimentation and deposition--Congresses.
Trace fossils--Congresses.
Trace fossils.
Princeton subject headings:
Paleoecology.
Sedimentary structures.
Sedimentation and deposition.
Trace fossils.