References in periodicals archive ?
The genera Obolus Eichwald, 1829 and Ungula Pander, 1830 have been recognized by Popov and Khazanovitch in Popov et al.
1906 Obolus triangularis Mickwitz; Moberg & Segerberg, p.
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.
The concentration of eU in the talus deposit more than twice exceeded the average concentration of the area, characterizing the generally high but extremely variable share of the material originating from graptolite argillite and obolus phosphorite.
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).
Shell mineralogy of the lingulate brachiopods from the Baltic "Obolus phosphorite".
Cambrian Brachiopoda: Acrotreta; Linnarssonella; Obolus; with descriptions of new species.
The first written data available on the use of Obolus phosphate rocks date from the 19th century.
Since the early studies by Opik (1929) these deposits have been called "Obolenphosphorite", or Obolus phosphorite.
bicarinata (Kutorga) is almost three times thinner than the shell of Obolus apollinis Eichwald (comp.
O mineralogij i geohimij obolovyh pescanikov i diktionemovyh slancev Severnoj Estonij (Mineralogy and geochemistry of Obolus sandstone and Dictyonema shale in North-Estonia).
The Cambrian section contains famous "blue clay", Lower Ordovician section--phosphate Obolus sandstone (shelly phosphorite), and Upper Ordovician--oil shale (kukersite).
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