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|description={{en|1=Figure 27.6 A, sketch showing the details of some of the pillows. The outer surface (a) is chilled, and can rarely be seen as a glass; mostly it is glass which has been almost totally replaced by chlorite, thus giving many of the pillows a green external colour. The interior of the pillow often has vesicles (b) which may be in radiating trails or in concentric lines which are preferentially developed towards the top of the pillows. The spaces beween the pillows are often filled with a fibrous calcite (c) and the centre of the pores may be filled with chert (d). B, illustrates two tubes T1 and T2 in section, with the lavas flowing from the right. T1 has provided the relief over which T2 has flowed; P are the two pillow-buds (incipient pillows) developed on the top of T2, and one pillow probably flopped over after it was inflated. The dark area is unfilled space. C is a plan sketch of the base of a sequence of pillow lavas. T1, T2 and T3 are the bases of three tubes. T1, 2 in particular have grown many pillow-buds b1 and b2, and some pillows (P). The dark areas are pore-space fillings which occur between the tubes and pillows. D, a section through a pillow which, when inflated did not fill with lava. It was subsequently partly filled with chert.
{{GSGGlasgow}}}}
|date=2019-02-11 18:25:28
|source=Geological Society of Glasgow
|author=Geological Society of Glasgow
|permission=
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}}

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