Intraclast

In thin section the rock is composed of intraclasts (180/i modal diameter) and foraminifera (180/i modal diameter), in a matrix of microspar (4/i to 8/i diameter; mode 7fi.).

The bodies of these beds typically show coarse-tail reverse grading of pumice and sedimentary intraclasts or coarse-tail normal grading of all clasts, although grading is absent in some of the intraclast-rich breccia beds.

They are regarded as distal turbidites and are interbedded with bioclastic limestones and massive breccioid limestones containing blocks of coral colonies and intraclasts that are regarded as proximal turbidites.