Polished fossil stromatolite slab. Domal from Irregully formation IRR132 asperia Approximate dimensions at widest points

Approximate dimensions at widest points 145 mm  x 110 mm  x 33 mm thick

This museum quality specimen has been cut at right angles to the bedding and displays the columnar structure beautifully

SPF131   Fossil stromatolite

Sections consist of a chaotic mixture of dolomite and/or stromatolite fragments set in a matrix of mudstone and/or coarsely crystalline dolomite

IRR 131    Fossil stromatolite slab

Polished fossil stromatolite slab. Domal from Irregully formation IRR132 asperia Approximate dimensions at widest pointsIRR 132 Fossil stromatolite slab, polished on one side. Totally replaced by colourful chert ! From the Proterozoic "Irregully Formation", age approx. 1. 1 billion years. Dimensions at widest points approximately 160 mm x 150 mm x 19 mm thick. It weighs 546 grams..