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Basalt columns and columnar joints converge upwards in a Tertiary volcanic vent with an age about 14.07±0.37 Ma (K-Ar age, whole rock), north of Jijiazhuang village in the Chnagle area, Shandong province, China. Attitude of these converged BCCJ are possible related to upward conflux of basalt magma. PhotoID159

Basalt columns and columnar joints converge upwards in a Tertiary volcanic vent with an age about 14.07±0.37 Ma (K-Ar age, whole rock), north of Jijiazhuang village in the Chnagle area, Shandong province, China. Attitude of these converged BCCJ are possible related to upward conflux of basalt magma. PhotoID159

Photograph: Xing-Wang Xu

Reference: This is a Journal of Structural Geology Photograph of the Month (JSG in press)