Dolerite Dyke Traversing the Chalk and Basalts, Cavehill Qua
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Dolerite Dyke Traversing the Chalk and Basalts, Cavehill Qua
Dolerite Dyke Traversing the Chalk and Basalts, Cavehill Quarry, Belfast - an overview of the stratas of rock. (Location: Northern Ireland: County Antrim: Belfast). Date: circa early 1900s
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Media ID 14356164
© National Museums NI / Mary Evans
Antrim Belfast Cavehill Chalk Dyke Overview Quarry Traversing Dolerite
EDITORS COMMENTS
This photograph offers an intriguing glimpse into the geological past of Belfast, Northern Ireland, specifically at Cavehill Quarry in County Antrim. The image, taken circa early 1900s, showcases the remarkable intersection of three distinct geological formations: chalk, basalts, and dolerite. The foreground of the photograph reveals the chalk stratum, characterized by its soft, white, and porous texture. Chalk is typically formed from the accumulation of microscopic organisms, such as foraminifera and coccolithophores, over millions of years. The chalk's delicate beauty contrasts starkly with the rugged, dark bands of basalt and dolerite in the background. The basalts, represented by the middle layer, are a volcanic rock formed from the rapid cooling of basaltic lava. Their dark, fine-grained texture is a result of their rapid solidification. Basalts are often associated with volcanic activity and are abundant in the region due to Northern Ireland's volcanic past. The most prominent feature in the photograph is the dolerite dyke, which traverses the chalk and basalts. Dolerite is a coarse-grained, intrusive igneous rock, formed when magma cools and solidifies slowly beneath the Earth's surface. The dyke's intrusion through the chalk and basalts is evidence of the tectonic forces that have shaped the geology of this region over millions of years. This photograph, with its stunning display of geological formations, offers a captivating window into the rich history of the Earth and the natural wonders that lie beneath our feet. The intersection of the chalk, basalts, and dolerite at Cavehill Quarry in Belfast, Northern Ireland, is a testament to the dynamic and ever-changing forces that have shaped our planet.
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