Countenance
Weathered gabbro river boulder from Grant County on a base of countertop scrap. Gabbro is a rock that forms when basalt lava cools very slowly miles deep in the earth, allowing large crystals of white plagioclase and black pyroxene to form. Over many millions of years those miles of overlying rock were eroded away, allowing this piece to reach the surface, where it was picked up by the John Day River and rounded and smoothed as it rolled along the river bed. When the river began to cut deeply and rapidly into bedrock, it was soon left as part of a terrace of river gravel hundreds of feet above the modern valley floor, where it began to weather, crack and crumble on the surface.
Gabbro 100-200 million years old, boulder 25,000-100,000 years old
HxWxD; 10", 7", 7"
Available for Sale: $500
Gabbro 100-200 million years old, boulder 25,000-100,000 years old
HxWxD; 10", 7", 7"
Available for Sale: $500
