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A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.
Among Michigan's early significant fossil finds was the 1839 discovery of the state's first scientifically documented American mastodon remains. [11] Later in the 19th century was the 1877 discovery of five Pleistocene peccaries ( Platygonus compressus ) in an Ionia County peat bog located near the town of Belding .
Geologic map of the Michigan Basin. The Michigan Basin is a geologic basin centered on the Lower Peninsula of the U.S. state of Michigan.The feature is represented by a nearly circular pattern of geologic sedimentary strata in the area with a nearly uniform structural dip toward the center of the peninsula.
Fossil of the Carboniferous horsetail relative Annularia †Annularia †Annularia asteris †Annularia sphenophylloides †Athyris †Atrypa †Atrypa traversensis †Aulopora †Aulopora microbuccinata †Bellerophon †Calamites †Calamites carinatus †Calamites cistii †Calamites ramosus †Calamites schutzeiformis †Calamites suckowii
Corals were the most common animals found in Devonian Michigan. There were three types of coral found in Devonian Michigan: branching, colony, and solitary corals. These corals are found as fossils in almost every fossil site in Michigan. This is because the Devonian was a time of great reefs, which covered most of the world's oceans.
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The Long Lake Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
A survey of Lake Michigan located at least 40 large craters on the lakebed. Initial studies highlighted the spots as unknown shapes, but additional research revealed the craters are filled with ...