Typical features of subaqueous volcanic rocks include perlite with glassy structure and pillowstructure, lamellar tuff, bentonite.
水下喷发火山岩典型标志为珍珠岩、玻璃质结构、枕状构造、纹层状凝灰岩和膨润土。
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Pillowstructure consists of a suit of deformed concave upward bodies made of silt and sand whose original layering bent round parallel the basal surface and it truncated at the top surface.