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Gemological characteristics of jewelry-ornamental septaria of the Ulyanovsk region
Published 2019-05-01“…Septaria are associated with lower Cretaceous sediments and are located in the coastal cliffs and the beach area of the Volga river. Septaria consist mainly of calcite — 89 wt. %. …”
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Mineralogy of interior jewellery ammonites of the Samara region
Published 2022-10-01“…The ammonites under study can be collected along the coastal cliffs and beach area of the Volga river, thereby requiring no capital investments and producing no environmental pollution.…”
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