Nephrite as a surface treatment. A lot of nephrite tools and amulets are known since the Early Neolithic (VII mill. BC) to the Late Chalcolithic (V mill. BC) on the Balkans (mainly Bulgaria; also in Greece, Serbia, Croatia) from two or more unknown sources - Balkan "nephrite culture". Such tools are found in the Later Neolithic of Poland (from the most probable local source Jordanów), Sardinia (Italy) (unknown source) and Switzerland (Kostov, 2005; 2013). Single or just a few finds of nephrite artifacts are reported also from some other European countries. During Neolithic times, the key known sources of nephrite jade
The Continuity of Life Forms gateway experience to what may become a deeper relationship with the natural world. So bringing 'The Continuity of Life Forms' back at this same location is ideal." The organization hopes the re-installation will introduce another generation to the artwork and Martin, who died in a plane crash in 1985. The Continuity of Life Forms The Continuity of Life Forms is a mosaic by Willard Martin, installed at the Oregon Zoo in Portland, Oregon. "The Continuity of Life Forms" is a large mid-century modern mosaic and one of the earliest remaining works by local architect and artist Willard "Will" Martin, who