Abstract

Pillow lavas of Cretaceous and Neogene age well exposed in Hokkaido, Japan, and those of Neogene age in North Island, New Zealand, provide evidence of their mode of growth. Some pillow lobes diverge by formation of longitudinal surface spreading cracks; the others grow by formation of transverse spreading cracks, leaving one or more crusts ending toward the front of the lobes and constrictions. Therefore, it is possible to determine the direction of growth of pillow lobes by tracing the crusts and/or constrictions.

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