MINING MATTERS - FOSSILS OF ONTARIO - TEACHER SET CONTENTS TABULATE “CHAIN” CORAL (ANTHOZOA - TABULATA) - Halysites species Silurian Period (about 435 million years), Fossil Hill Formation Manitoulin Island

small fragment of a colony made up of many individual corallites linked together in chain-like rows; each corallite contained a single coral polyp

-OR- TABULATE “HONEYCOMB” CORAL (ANTHOZOA - TABULATA) - Favosites species Silurian Period (about 435 million years), Fossil Hill Formation Manitoulin Island

small fragment of a colony made up of many individual polygonal corallites in tightly packed arrays; each corallite contained a single coral polyp

RUGOSE “HORN or CUP” CORAL (ANTHOZOA - RUGOSA) - Heliophyllum species Devonian Period (about 385 million years), Hamilton Group Ausable River

a solitary coral polyp built and lived in this little cup-shaped supporting structure BRACHIOPOD (BRACHIOPODA) - Mucrospirifer species Devonian Period (about 385 million years), Hamilton Group Thedford

two triangular valves that enclosed the soft brachiopod body

BRYOZOAN (BRYOZOA) - Prasopora species Ordovician Period (about 450 million years), Verulam Formation Kirkfield

each tiny hole in these mound-shaped colonies housed a microscopic bryozoan zooid

GASTROPOD (MOLLUSCA) - Liospira species Ordovician Period (about 450 million years), Verulam Formation Gamebridge

internal mould – formed from mud that infilled the open spiral-shaped snail shell after the animal died

TRILOBITE (ARTHROPODA - TRILOBITA) – Pseudogygites latimarginatus Ordovician Period (about 445 million years), Lindsay Formation (Collingwood Member) Craigleith

triangular pygidium (“tail shield”) showing the three lengthwise lobes that characterize most trilobites (other fragments may be present)

Use magnifier! Best when wet!