Geologic cross-sections m norice that the red name: course/section a beview the key to symbols at the bottem of fg a821.on the lines provided for each croection in figs ab2.1 and as22, wrire leters to indicate the sequence of evests from olde (fine in the sequence of even) o younges (a in the sequence of evenm), refer so figs. 82-8.10 and the principles of relative dating that are explained in the sest an needed date: evel youngest -h geologic cross section 1 oldest muav limestone youngest h bright angel shale tapeats sepdstone basi twinmae chuar shales dos sandstone grand canyon hakatai shale rasalt gorge shinume quartzite c vishna schist zoroaster granite j geologic cross section 2 oldest key to symbols sedimentary rocks lgneous rocks metamorphic rocks conglomerate gravel sandstone granite sitstone basalt gneiss schist other features shale clay limestoner dolomite zone of contact metamorphism unconformity fault contact figure a8.2.1 uruquen uejqueoa