obolus


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  • noun

Words related to obolus

a Greek unit of weight equal to one tenth of a gram

References in periodicals archive ?
Obolus ingricus Eichwald, 1829, Cambrian, Furongian, Estonia; Obolus triangularis Mickwitz, 1896, Cambrian, Furongian, Estonia.
The genera Obolus Eichwald, 1829 and Ungula Pander, 1830 have been recognized by Popov and Khazanovitch in Popov et al.
Between the Cambrian sand- and siltstones and Ordovician limestones occur the major sources of Rn: Lower-Ordovician obolus sandstone with P-rich layers of phosphorite that are overlain by graptolite argillite.
The position of the northern boundary of the distribution area of graptolite argillite and obolus sandstone (with phosphorite) prior to the continental glaciation is not known, but based on the palaeogeographic conclusions (Mannil, 1966), it was several kilometres or even tens of kilometres northward of their present-day outcrop line in the klint escarpment.
Possibly, due to preservation of only primarily mineralized shell components (the first apatite generation), the shell structure is the same as in Tilasia rugosa (Holmer 1991) or Obolus apollinis (Williams & Cusack 1999).
One can find the phosphatic Obolus sandstone, including brachiopod bivalves and fragments, radioactive alum shale, glauconite-rich gray bentonite clay and glauconitic sandstone.
The first written data available on the use of Obolus phosphate rocks date from the 19th century.
In this study, we used XRD analysis of heat-treated fossil brachiopods to test the presence of OH-containing carbonate fluorapatite in the shells of the Cambrian lingulate brachiopod Obolus apollinis Eichwald.
Since the early studies by Opik (1929) these deposits have been called "Obolenphosphorite", or Obolus phosphorite.
The baculate structure is similar to that of Obolus apollinis Eichwald, with the exception that the baculi of Bicarinatina bicarinata are thinner.
bicarinata (Kutorga) is almost three times thinner than the shell of Obolus apollinis Eichwald (comp.
They are overlain by the Lower Cambrian greenish-gray to variegated clay, silt- and sandstone, the Lower Ordovician Tremadock Obolus sandstone (phosphorite) and Dictyonema shale.
The name was applied to a transition between the Dictyonema Shale (with many interbeds of quartzose sandstone in the lower part) of the Turisalu Formation and the Obolus Sandstone represented in NE Estonia.
famous "blue clay"), Lower Ordovician--sandstone, including phosphate Obolus sandstone (shelly phosphorite), and Upper Ordovician--oil shale (kukersite).
The Cambrian section contains famous "blue clay", Lower Ordovician section--phosphate Obolus sandstone (shelly phosphorite), and Upper Ordovician--oil shale (kukersite).