A burnt papa conglomerate which has some concrete mixed in with it.
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Small kilns were constructed on the sides of the road. 'Face kilns' were made in cavities that were blasted in the sides of the papa cliff, and built up with alternate layers of timber and clay. Both types of kilns were covered with more clay before being lit. Firing took several days, after which the brick-like product was broken up by hand and spread on to the road. Nearly all of Taranaki's burnt papa roads are covered now with gravel or bitumen, but fragments may still be seen on Marco Road near Kohuratahi, and outside the Whangamomona cemetry.
' Papa burning ' was used in the Whangamomona and Ohura Areas, and on Mount Messenger. Once the railway arrived, however, gravel was railed in, and papa burning finished.