Heliophyllum halli Fossil Coral – Middle Devonian Hamilton Shale – Arkona Ontario Canada – Genuine Fossil with Certificate

Description This listing features a genuine fossil of Heliophyllum halli, a solitary rugose coral from the Middle Devonian period, recovered from the Hamilton Shale of Arkona, Ontario, Canada. Known commonly as a “horn coral”, Heliophyllum halli is one of the most iconic solitary corals of the Devonian seas. The photo shows the exact specimen you will receive, and a 1cm scale cube is included for accurate sizing – please refer to the image for full dimensions. Fossil Details: Type: Fossil Rugose Coral (Horn Coral) Species: Heliophyllum halli Order: Rugosa Family: Zaphrentidae Phylum: Cnidaria Kingdom: Animalia Formally Described By: Milne-Edwards & Haime, 1851 Geological & Stratigraphic Context: Geological Period: Devonian Epoch: Middle Devonian Formation: Hamilton Group – Arkona Shale Member Biozone (where applicable): Mucrospirifer and Phacops rana are commonly associated taxa Location: Arkona, Lambton County, Ontario, Canada Depositional Environment: Shallow, warm marine shelf environment with mudstones, shales, and carbonate lenses reflecting a calm, offshore setting rich in marine fauna Morphology & Notable Features: Distinctive conical shape with radial septa visible in transverse cross-section Cup-shaped calice often preserved with internal detail Surface may display costae (external ribs) and septal grooves from the polyp’s skeletal walls Solitary coral, not part of a colony—typical of rugose corals during this time Frequently found associated with brachiopods, trilobites, and bryozoans of the Arkona Shale Scientific Significance: Heliophyllum halli is an important guide fossil for correlating Middle Devonian marine strata in North America It is one of the most studied solitary corals from the Hamilton Group and provides insight into reef and benthic ecosystems of the Devonian Excellent example of early coral reef biodiversity and skeletal development Why Buy From Us? All fossils are 100% genuine, responsibly collected Includes a Certificate of Authenticity Exact specimen pictured – no substitutes Perfect for fossil collectors, educators, and palaeontology enthusiasts This impressive Heliophyllum halli horn coral fossil from the Middle Devonian Hamilton Shale of Arkona, Canada is a scientifically important and visually striking specimen, ideal for display or educational use.