Oolite

Oolite

Photographed by Michael P. Klimetz

Collected by Dr. Alexander Lukeneder and Dr. Mathias Harzhauser [2016]

Geological-Paleontological Department

Natural History Museum

Vienna

AUSTRIA

Calcareous Oolite

Upper Jurassic-Tithonian

Stranska Skala Hill Formation

Stranska Skala near Brno

CZECH REPUBLIC

Photographed by Michael P. Klimetz

Collected by Dr. Alexander Lukeneder and Dr. Mathias Harzhauser [2016]

Geological-Paleontological Department

Natural History Museum

Vienna

AUSTRIA

Calcareous Oolite

Upper Jurassic-Tithonian

Stranska Skala Hill Formation

Stranska Skala near Brno

CZECH REPUBLIC

Photographed by Michael P. Klimetz

Collected by Dr. Alexander Lukeneder and Dr. Mathias Harzhauser [2016]

Geological-Paleontological Department

Natural History Museum

Vienna

AUSTRIA

Calcareous Oolite

Upper Jurassic-Tithonian

Stranska Skala Hill Formation

Stranska Skala near Brno

CZECH REPUBLIC

Photographed by Michael P. Klimetz

Collected by Dr. Alexander Lukeneder and Dr. Mathias Harzhauser [2016]

Geological-Paleontological Department

Natural History Museum

Vienna

AUSTRIA

Calcareous Oolite

Upper Jurassic-Tithonian

Stranska Skala Hill Formation

Stranska Skala near Brno

CZECH REPUBLIC

Photographed by Michael P. Klimetz

Collected by Dr. Alexander Lukeneder and Dr. Mathias Harzhauser [2016]

Geological-Paleontological Department

Natural History Museum

Vienna

AUSTRIA

Calcareous Oolite

Upper Jurassic-Tithonian

Stranska Skala Hill Formation

Stranska Skala near Brno

CZECH REPUBLIC

Oolite or oölite (egg stone) is a sedimentary rock formed from ooids, spherical grains composed of concentric layers. The name derives from the Ancient Greek word for egg. Strictly, oolites consist of ooids of diameter 0.25–2 mm; rocks composed of ooids larger than 2 mm are called pisolites. The term oolith can refer to oolite or individual ooids.Ooids are most commonly composed of calcium carbonate (calcite or aragonite), but can be composed of phosphate, clays, chert, dolomite or iron minerals, including hematite. Dolomitic and chert ooids are most likely the result of the replacement of the original texture in limestone. Oolitic hematite occurs at Red Mountain near Birmingham, Alabama, along with oolitic limestone. They are usually formed in warm, supersaturated, shallow, highly agitated marine water intertidal environments, though some are formed in inland lakes. The mechanism of formation starts with a small fragment of sediment acting as a 'seed', e.g. a piece of a shell. Strong intertidal currents wash the 'seeds' around on the seabed, where they accumulate layers of chemically precipitated calcite from the supersaturated water. The oolites are commonly found in large current bedding structures that resemble sand dunes. The size of the oolite reflects the time they have had exposed to the water before they were covered with later sediment. Some exemplar oolitic limestone, a common term for an oolite, was formed in England during the Jurassic, and forms the Cotswold Hills, the Isle of Portland with its famous Portland Stone, and part of the North Yorkshire Moors. A particular type, Bath Stone, gives the buildings of the World Heritage City of Bath their distinctive appearance.The islands of the Lower Keys in the Florida Keys, as well as some barrier islands east of Miami bordering Biscayne Bay, are mainly oolitic limestone, which was formed by deposition when shallow seas covered the area between periods of glaciation. The material consolidated and eroded during later exposure above the ocean surface. One of the world's largest freshwater lakebed oolites is the Shoofly Oolite, a section of the Glenns Ferry Formation on southwestern Idaho's Snake River Plain. Ten million years ago, the plain formed the bed of Lake Idaho. Wave action in the lake washed sediments back and forth in the shallows on the southwestern shore, forming ooids and depositing them on steeper benches near the shore in 2- to 40-foot thicknesses. When the lake drained (2 to 4 million years ago), the oolite was left behind, along with siltstone, volcanic tuffs and alluvium from adjacent mountain slopes. The other sediments eroded away, while the more resistant oolite weathered into hummocks, small arches and other intriguing natural shapes. The Shoofly Oolite lies on public land west of Bruneau, Idaho managed by the Bureau of Land Management. The physical and chemical properties of the Shoofly Oolite are the setting for a suite of rare plants, which the BLM protects through land use management and on-site interpretation. This type of limestone is also found in Indiana in the United States. The town of Oolitic, Indiana, was founded for the trade of limestone and bears its name. Quarries in Oolitic, Bedford, and Bloomington contributed the materials for such iconic U.S. landmarks as the Empire State Building in New York and the Pentagon in Arlington, Virginia. Many of the buildings on the Indiana University campus in Bloomington are built with native oolitic limestone material, and the Soldiers' and Sailors' Monument in downtown Indianapolis, Indiana, is built mainly of grey oolitic limestone. Oolites also appear in the Cambrian age Conococheague limestone, in the Great Appalachian Valley in Pennsylvania, Maryland, West Virginia, and Virginia. Rogenstein is a term describing a specific type of oolite in which the cementing matter is argillaceous.