Preliminary Geotechnical Investigation · OPW21/0315

Graphic Symbols for Soil and Rock

General                             Sedimentary Rocks

            Asphalt                             Boulder conglomerate


            Road base                           Conglomerate


            Concrete                            Conglomeratic sandstone


            Filling                             Sandstone


Soils                                           Siltstone


            Topsoil                             Laminite


            Peat                                Mudstone, claystone, shale


            Clay                                Coal


            Silty clay                          Limestone


            Sandy clay              Metamorphic Rocks

            Gravelly clay                       Slate, phyllite, schist


            Shaly clay                          Gneiss


            Silt                                Quartzite


            Clayey silt
                                    Igneous Rocks

            Sandy silt                          Granite

            Sand                                Dolerite, basalt, andesite

            Clayey sand                         Dacite, epidote

            Silty sand                          Tuff, breccia

            Gravel                              Porphyry

            Sandy gravel


            Cobbles, boulders

            Talus




                                                                             May 2017