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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.
Tabulate and tetra- corals appear. [5] Accumulations of these corals up to seventy feet thick are known from places like Engadine, Gould City, and Trout Lake. [5] During the following period, the sea still covered Michigan. [2] Crinoids were very abundant in Michigan during the Devonian. [5]
This list of the Paleozoic life of Michigan contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Michigan and are between 538.8 and 252.17 million years of age.
Further analysis estimated that the 10-foot-fall young Rex likely weighed in at a whopping 3,500 pounds and was about two-thirds the size of an adult at 25 feet from tail to nose. It was believed ...
Based on the size of the tibia, experts estimate the dinosaur was 13 to 15 years old when it died and likely weighed around 3,500 pounds — about two-thirds of the size of a fully-grown adult T rex.
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
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Based on early estimates, Lyson thinks the fossil is that of a young T. rex that died of an unknown cause when it was 13 or 15 years old. It was about 25 feet long and weighed about 3,500 pounds.