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Three-dimensional seismic data from the NW European Atlantic margin provide detailed data on the relationships between sills, dykes, laccoliths and pre-existing basin structure. The data show that sills are predominantly concave-upwards in shape, being complete or partial versions of radially or bilaterally symmetrical forms that possess flat inner saucers connected to a flat outer rim by a steeply inclined sheet. Sills can be sourced from the steep climbing portions of deeper sills, and can be shown to exploit pre-existing faults to feed shallower sills and laccoliths. Magma flow patterns, as revealed by opacity rendering, suggest that sills propagate upwards...

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