| Spiriferina Temporal range: Late Silurian - Middle Jurassic ~ | |
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| Spiriferina rostrata | |
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| Genus: | Spiriferina D'Orbigny, 1847 |
Spiriferina is an extinct genus of brachiopods that lived from the Late Silurian to the Middle Jurassic in Asia, Europe, North America, South America, and New Zealand. [1]
The following species have been described: [1]
The Black–Scholes or Black–Scholes–Merton model is a mathematical model for the dynamics of a financial market containing derivative investment instruments. From the parabolic partial differential equation in the model, known as the Black–Scholes equation, one can deduce the Black–Scholes formula, which gives a theoretical estimate of the price of European-style options and shows that the option has a unique price given the risk of the security and its expected return. The equation and model are named after economists Fischer Black and Myron Scholes. Robert C. Merton, who first wrote an academic paper on the subject, is sometimes also credited.
Modern English is written with a Latin-script alphabet consisting of 26 letters, with each having both uppercase and lowercase forms. The word alphabet is a compound of alpha and beta, the names of the first two letters in the Greek alphabet. Old English was first written down using the Latin alphabet during the 7th century. During the centuries that followed, various letters entered or fell out of use. By the 16th century, the present set of 26 letters had largely stabilised:
The AMA Motorcycle Hall of Fame Museum is an offshoot of the American Motorcyclist Association, recognizing individuals who have contributed to motorcycle sport, motorcycle construction, or motorcycling in general. It also displays motorcycles, riding gear, and memorabilia in two floors of exhibits. The American Motorcyclist Association board began planning the museum c. 1998.
The Muschelkalk is a sequence of sedimentary rock strata in the geology of central and western Europe. It has a Middle Triassic age and forms the middle part of the three-part Germanic Trias lying above the older Buntsandstein and below the younger Keuper. The Muschelkalk ("mussel-chalk") consists of a sequence of limestone and dolomite beds.
The Helms Formation is a geologic formation in Texas and New Mexico. It preserves fossils dating back to the Chesterian (Serpukhovian) Age of the Carboniferous period.
The Luning Formation is a geologic formation in Nevada. It preserves fossils dating back to the Triassic period. The lowermost strata dates to the late Carnian-early Norian boundary.
The Kandreho Formation is an Early Jurassic geological formation of the Mahajanga Basin of Madagascar. The marly limestones of the formation were deposited in a subtidal lagoonal environment. The formation overlies the Bouleiceras and Spiriferina beds of the early Toarcian and has been correlated to the Marrat Formation of Saudi Arabia. Fossils of the marine crocodylian "Steneosaurus" as well as bivalves and the ammonite Nejdia have been found in the formation. The name Kandreho Formation was proposed by Geiger in 2004.
Fossil Mountain is a prominence that is located on a spur in the Western Grand Canyon, in Coconino County, Arizona. The summit of this prominence has a summit elevation of 6,729 ft (2,051 m) and lies about 1 mi (1.6 km) southeast of the Grand Scenic Divide, and 1 mi (1.6 km) west of Havasupai Point. This summit lies almost level with the surface of the adjacent tableland of the South Rim, the forested Kaibab Plateau.
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