5.4" Fenestella Fossil Bryozoan Moss Animal Upper Ordovician Age Macao Portugal Sardonyx Calcite is more stable and

Calcite is more stable and common than Aragonite under the chemistry of our modern seas

whose physiological and ecological flexibility proved decisive when countless other species vanished forever

brontotheres evolved and diversified

This texture distinguishes diogenites from volcanic meteorites that cooled rapidly at or near the surface

heavier minerals like orthopyroxene crystallized and settled

5.4" Fenestella Fossil Bryozoan Moss Animal Upper Ordovician Age Macao Portugal Sardonyx Calcite is more stable andLocation: Macao, Portugal Weight: 14 Ounces Dimensions: 5. 4 Inches Long, 2. 7 Inches Wide, 1. 2 Inches Thick (Matrix) The item pictured is the one you will receive. Upper Ordovician, 452 Million Years old. Fenestella is a genus of bryozoans, also known as moss animals, that form fan shaped colonies with a netted appearance. These organisms are characterized by their skeletal structure, which consists of stiff branches interconnected by narrower