Armashevsky, Petro [Армашевський, Петро; Armaševs'kyj], b 13 January 1851 in Novozybkov, Chernihiv gubernia, d 22 May 1919 in Kyiv. Geologist and petrographer, professor at Kyiv University from 1885. Armashevsky drew a geological map of the Chernihiv region and Poltava region and determined Paleozoic sedimentation in Volhynia (1898) and the exact stratigraphy of the Paleogenic sedimentation of Ukraine (1903). He was the first to put forward the hypothesis concerning the aqueous origin of loess; he studied soil erosion in the region of Kyiv and did research in hydrogeology.

[This article originally appeared in the Encyclopedia of Ukraine, vol. 1 (1984).]