Department or Administrative Unit
From time to time isolated, rounded pebbles of petrified wood have been encountered in the Ellensburg gravels that overlie the Columbia Basalts in Central Washington. Recently a sufficient number of these specimens were collected to justify a study of the petrified woods of this above-named formation.
Beck, G. F. (1937). Determination of Fossil Woods (Basswood in Ellensburg Formation). The Mineralogist, 6(1), 13.
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