Coprolite.

Pretty self-explanatory.

Fossils - Phylum Hemichordata, Class Graptolite

Sample 30:

Sample 31:

Fossils - Phylum Echinodermata, Class Echinoidea

Sample 28:

Sample 29:

Fossils - Phylum Echinodermata, Class Blastoidea

Sample 27:

Fossils - Phylum Echinodermata, Class Crinoidea

Sample 26:

Fossils - Phylum Arthropoda, Class Trilobita

Sample 22:

Sample 23:

Sample 24:

Fossils - Phylum Mollusca, Class Cephalopoda

Sample 19:

Order - Nautiloidea (smooth sutures)

Sample 20:

Order - Ammonoidea (complex sutures)

Sample 21:

Order - Belemnoidea (bullet shaped)