pumiceous


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pumiceous

[pyü′mish·əs]
(geology)
Pertaining to the texture of a pyroclastic rock, such as pumice, characterized by numerous small cavities presenting a spongy, frothy appearance.
References in periodicals archive ?
The white pumiceous lapilli are high-K andesite (Si[O.sub.2]: 58-60 wt.
Trachyandesites-porphyritic andesites occur mostly in the southern to western parts of the Sabalan caldera and are associated with pumiceous andesites.
Although the Olcese Sand is predominantly a marine unit, the middle part of this unit is nonmarine with lenses of marine deposits and is distinguish by fine- to coarse-grained, often pumiceous, sandstone with occasional gravel lenses, strong cross bedding, and a bluish-grey color.
greyish brown clay loam; sticky, plastic, very friable; moderately developed 50-100 mm blocky structure; < 0.1%, < 1 mm vesicular pores; few 1-2 mm vertical and horizontal roots; indistinct, discontinuous boundary because of pods of younger pumiceous tephra from above.
These differences appear related to coarse, pumiceous soils and steeper slopes on Pine Creek Ridge.