One woman's quest for geological understanding!

Fossil of the week: “Horn Coral”

Heliophyllum (or “Horn Coral”) is an extinct Genus of Coral that existed predominantly in the
Devonian (408-360 million years ago).
This well preserved specimen was found in the beechwood limestone (Clark County, Indiana, USA)

This picture of the Heliophyllum horn coral shows the beaded pattern along its septa lines.

Heliophyllum (Rugosa / Horn Coral) Heliophyllum (Rugosa / Horn Coral)

Scientific classification
Domain: Eukarya
Kingdom: Animalia
Phylum: Cnidaria
Class:     Anthozoa
Subclass: Zoantharia
Order:     Rugosa
Family: Zaphrentidae
Genus:     Heliophyllum

Corals are filter feeders, therefore there existance in a succession indicates that:
– they lived inclear warm seawater
– they are algae symbiont, so are representative of the photic zone

Heliophyllum (Rugosa / Horn Coral)
Heliophyllum (Rugosa / Horn Coral)
Heliophyllum (Rugosa / Horn Coral) Heliophyllum (Rugosa / Horn Coral)

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