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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.
Michigan was at least partly covered by seawater during the Cambrian. [3] Life in Michigan's Cambrian seas included some brachiopods, cephalopods, gastropods, and trilobites. Trilobites would become more common in Michigan as the Paleozoic progressed. [1] During the ensuing Ordovician, Michigan remained inundated by seawater. [2]
This list of the prehistoric life of Michigan contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Michigan. Precambrian [ edit ]
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 ...
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.
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.
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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.