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Hexagonaria is a genus of colonial rugose coral. Fossils are found in rock formations dating to the Devonian period, about 350 million years ago. Specimens...

often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. Such stones were formed as a result of glaciation, in which...

stone: Petoskey stone (since 1965). It is composed of fossilized coral (Hexagonaria pericarnata) from long ago when the middle of the continent was covered...

†Hexagonaria †Hexagonaria bella †Hexagonaria cincta †Hexagonaria curta †Hexagonaria ovoidea †Hexagonaria partita †Hexagonaria ponderosa †Hexagonaria prisma...

Close view of polished Hexagonaria percarinata, a Devonian rugose coral from Michigan....

Atrypa and Spirifer. Corals of Mississippian Iowa included the colonial Hexagonaria of southeastern Benton County. Crinoids left behind remains in what are...

include Michigan's state stone, the Petoskey stone (the extinct coral Hexagonaria percarinata), among other corals and records of ancient marine life....

song's authors, the song is rarely performed today. Stone Petoskey Stone Hexagonaria pericarnata 1965 Tree Eastern White Pine Pinus strobus 1955 Wildflower...

†Hedeia †Heslerodus †Heslerodus divergens †Hexagonaria †Hexagonaria minuta †Hexagonaria occidens †Hexagonaria palmeri †Hostimella †Hostimella hostimensis...

†Grewingkia canadensis †Hallopora †Hallopora subnodosa †Halysites †Hexagonaria †Hexagonaria pericarinata †Hindia †Holopea †Icriodus †Isotelus †Isotelus gigas...

the family Polyporaceae Hexagonia (chess variant), published in 1864 Hexagonaria, a genus of colonial rugose coral This disambiguation page lists articles...

†Hesperidella †Hesperidella initialis †Hexagonaria †Hexagonaria bassleri †Hexagonaria inequalis †Hexagonaria oweni †Hexagonaria whitfieldi †Hibbardella †Hibbardella...

occurrences of solitary branches, all slabbed surfaces". A pachyporid. "Hexagonaria" "H." sp. Lowther Island, off-reef strata. "A single, well-preserved...

†Hedstroemia – tentative report †Heliophyllum †Hemirhodon †Hercynella †Hexagonaria †Hindeodus †Holopea †Homagnostus †Howittia †Icriodus †Icriodus angustoides...

tricenaria †Heterophrentis †Heterophrentis simplex †Heterotrypa †Hexagonaria †Hexagonaria pericarinata †Hindia †Hindia subrotunda †Hippocardia †Hippocardia...

Heterophrentis Heterophyllia Heterophylloides Heteropsammia Heterospongophyllum Hexagonaria Hexaheliocïenia Hexalasma Hexapetalum Hexaphyllia Hexismia Hezhangophyllum...

and grew to very large sizes. A common example of a colony coral is Hexagonaria, more commonly called the Petoskey stone, is the state stone of Michigan...

†Hexagonaria †Hexagonaria bella †Hexagonaria cincta †Hexagonaria curta †Hexagonaria ovoidea †Hexagonaria partita †Hexagonaria ponderosa †Hexagonaria prisma...

unidentified comparable form †Hastimima – tentative report †Hedeia †Hexagonaria †Hyolithes †Icriodus †Idiognathodus †Kaibabvenator – type locality for...

†Heterorthina fairmountensis †Heterotrypa †Hexagonaria †Hexagonaria anna †Hexagonaria stewartae †Hexagonaria tabulata †Hexagonaria truncata †Hexameroceras †Hindella...