Lower Silurian Sponge
Lower Silurian (Ordovician)
Hexactinellid Sponge
up to 3' length, 4" diam.
Mingan Islands, p.497.
 Lower Silurian Ammonite
Lower Silurian (Ordovician)
Trocolites Ammonius (Ammonite)
diameter can exceed 1 ft. p.508.
Lower Silurian Trilobite
Lower Silurian (Ordovician)
Trilobite Assphus platycephalus
up to 8" length. p.508
Trenton Falls, N.Y.
 Lower Silurian Asteroid
Lower Silurian (Ordovician)
Asteroid Palaeaster Jamesi
Lower Silurian Coral
Lower Silurian (Ordovician)
Coral Flavistella p.511