THE ROCK THAT'S ACTUALLY A FOSSIL!
(Fossil coral, Hexagonaria
This is fossil coral, with a beautiful
honeycomb pattern, fairly soft at Mohs 3 on the hardness scale.
Michigan's State Rock. Antrim County MI
holds a Petoskey Festival each year. Formed when Michigan was
covered by a sea in which coral reefs thrived, the coral gradually
became buried by sediment, which turned into limestone and shale.
The skeletons were replaced by calcite (calcium, carbon &
During the Ice Ages, from 1.6 million to
10,000 years ago, glaciers scraping over Michigan broke up soft,
fossil-bearing rocks. The pieces were carried along and dropped, now
found along lake beaches, road cuts, and gravel pits as rounded stones
from pebble size to potato-sized lumps. Dated to 350 million
years old (Devonian period). Found on the shores
of Little Traverse Bay from the northwestern tip of the Lower Peninsula,
especially around Petoskey and Charlevoix, Michigan.
The name "Petoskey" comes from an
Ottawa Indian chief. When he was born, sunbeams fell upon his face
so he was named Pe-tos-e-gay ("rising sun"). European
settlers Anglicized the name as Petoskey.