The next member is the Soquel, which is a thick bedded to massive micaceous sandstone.
2.
These are from the Ordovician period and consist of chert, phyllite and quartz rich micaceous sandstone.
3.
It consists of resistant, red-brown micaceous sandstones, conglomerates, siltstone and mudstone of mainly fluvial origin.
4.
The formation is composed of grey, purple and red shales with micaceous sandstone beds towards the top of the stratigraphical unit.
5.
During this work approximately 40 fragments of carved micaceous sandstone were recovered; the likely origin for these was surmised to be the Hilton of Cadboll stone.
6.
The micaceous sandstones of Carmarthenshire's Tilestones Formation were formerly worked to provide roofing material, as were similar flaggy sandstones elsewhere, at least until the burgeoning of the North Wales slate industry in the nineteenth century.
7.
Elseth, T ., Nicolaysen, R ., Roberts, D . E . R . Grain Density Correction of the Density Log : A Core-Log Calibration Method for Improved Porosity Prediction in Mineralized Micaceous Sandstone Reservoirs , SPWLA 42 nd Annual Logging Symposium, June 17 20, 2001.
8.
Besides stone tools, other stone artifacts found at Melkhoutboom included red and yellow ochre, pieces of shale and micaceous sandstone ( which are not found naturally in or near the cave and were therefore likely imports into the site ), and unmodified slabs of quartzite and quartzitic sandstone, some associated with hearths.
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