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Even the barren, arid, and windswept eastern slopes glowed bright with the volcanic muds locally called laterites, and the foliated beds of saibros and macapes, decomposed tufas oxidised red and yellow.
When all the angular fragments are of volcanic rocks the mass is usually termed a volcanic breccia. Laterite is a red or brick-like rock composed of silicate of alumina and oxide of iron. The red layers called "ochre beds," dividing the lavas of the Giant's Causeway, are laterites. These were found by Delesse to be trap impregnated with the red oxide of iron, and in part reduced to kaolin.
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