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Noun1.Gritrock - a hard coarse-grained siliceous sandstonegritrock - a hard coarse-grained siliceous sandstone
sandstone - a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
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References in periodicals archive ?
The aircraft with British Armed Forces personnel arrives in Sierra Leone in |support of Operation GRITROCK to assist with the Ebola crisis
The Argus, dubbed the Warhorse, sets sail from Falmouth on Friday to support Operation Gritrock and help train 5,000 local people in Sierra Leone to give medical care to sufferers.