References in periodicals archive ?
1969 Obolus (Obolus) triangularis Mickwitz; Goryanskij, p.
Ungula inornata is the replacement name for Obolus triangularis Mickwitz, 1896.
According to cladistic analysis of the chemico-structural characters of the shell, Ungula is phylogenetically closely related to the genera Obolus Eichwald, 1829, Oepikites Khazanovitch & Popov, 1984 (in Khazanovitch et al.
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.
3]) was observed when the soil with a background eU concentration was overlain by a dense and thick (> 20 cm) humus horizon and there existed an additional inflow of Rn from graptolite argillite and obolus phosphorite lying at a depth of 65-75 m.
The first written data available on the use of Obolus phosphate rocks date from the 19th century.
1) Alum shale and Obolus sandstone (phosphorite) with a high concentration of Rn.
Since the early studies by Opik (1929) these deposits have been called "Obolenphosphorite", or Obolus phosphorite.
Obolus apollinis Eichwald, 1829 is the type species of the genus Obolus, the type genus of the family Obolidae, which is one of the most diverse early Palaeozoic linguloid families (Popov & Holmer 2003).
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).
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