| So, processing of local dictyonema argillite started there to produce uranium and other useful minerals. |
| Low water levels reveal carved layers of green and red argillite. |
| Trenching and trail building show that the quartzite and interbedded argillite unit can be over 250 metres in true width. |
| Sandstone may be converted into quartzite, and shale into argillite, a compact, massive clay rock. |
| In the klint escarpment radioactive graptolite argillite and obolus phosphorite crop out. |
| It is very significant that we never find one where the workman used both flint and argillite. |
