n.1.(Paleon.) One of the microscopic siliceous spicules which occur abundantly in the texture of sponges, and are sometimes found fossil, as in flints.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The Hamersley and the Fitzgerald rivers have formed cliffs of splendidly colored spongiolite (a sedimentary rock of marine origin).
These are coarse-grained sandstones, locally conglomeratic and calcareous-glauconitic which continuously grade upwards into fine-grained calcsiliceous sandstones, also with glauconite and with significant content of sponge parts (so called spongiolites).