Description
Porphyry is a general term that is used rather loosely for igneous rocks which contain relatively large isolated crystals set in a fine-grained groundmass
370 mm x 180 mm x 20 - 40 mm thick
A domal stromatolite from the Proterozoic "Irregully Formation"
SPF123 Fossil stromatolite polished on one side with natural weathered exterior
Cut and polished on one side with natural rough exterior on rear
Polished fossil stromatolite. Wyloo Group. WG103 asperia ashburtonia Porphyry is a general termWG103 Fossil stromatolite slab polished on one side Dimensions at widest points approx. 220 mm x 170 mm x 10 mm thick. Weighs 1,006 grams From an unassigned unit of the Wyloo Group. Age is approx. 1. 8 billion years. From the same outcrop as Pseudogymnosolenid type which occur as a substrate beneath these ones. From south west of Newman Western Australia.