Late Archean Eon, 2.72 billion years BP. A cut and polished section of stromatolite with a number of pyrite inclusions; inked collector's find location note to the rear and attached information label. 490 grams, 10.6cm (4 1/4"). From a Leicestershire, UK, collection; acquired on the Australian art market; from near Nullagine, Western Australia. [No Reserve]