Distinctive Paleocene Utah Stromatolites



Geological Time: Late Paleocene

Size (25.4 mm = 1 inch): Stromatolites are 155 mm by 75 mm by 35 mm (maximum)

Fossil Site: Flagstaff Formation, Cove River Member, Central Utah, USA

Fossil: ST100

Price: Sold

StromatolitesDescription: This is a stromatolite as found in its natural un-cut form with the exception of one side that has been cut and polished to show the distinctive stromatolitic structure. A most unique feature is that this example is inordinately young for stromatolites. This one comes from the Late Paleocene of Utah from what was known as Lake Flagstaff. At its maximum extent Lake Flagstaff extended from the Uintah Mountains to the North to today’s Bryce Canyon in the South. The rocks of this formation document a time in Earth’s history of a growing greenhouse effect. Globally the temperatures rose by some 5 degrees Centigrade from about 58.5 million years ago to about 52.5 million years ago, with a concomitant decrease in rainfall. Locally the temperature rise is thought to have been some twice the global value. The lake transitioned from freshwater to saline during that time, then reverted to fresh some time in the Eocene.

The stromatolites were deposited during the saline period.
Stromatolites have persisted to the modern day in such places as Shark Bay, Australia where they continue their billions of years old lifestyle. While this piece would make a fine present for any natural history buff, anyone who appreciates art would also be glad to get thus wonderful specimen as a gift

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