A group of polished stromatolite slabs comprising: one subrectangular with label 'Protozoic Stromatolite > 1.1 billion years old Nr. Turee Creek Western Australia'; one trapezoidal with label 'Conical Stromatolite Undetermined Species, Gindalbie Group, Late Archaean Around 2.66 billion years old. Kalgoorlie, Western Australia'. 126 grams total, 7-12cm (2 3/4 - 4 3/4"). From a Leicestershire, UK, collection; acquired on the UK art market. [2, No Reserve] Very fine condition.