Erosion causes the river to slice through the rock, revealing succeeding epochs of sandstone, shale and limestone, piled up like a layer cake.
(epochs of sandstone, shale and limestone; piled up; ) (Erosion; causes; the river to slice through the rock, revealing succeeding epochs of sandstone, shale and limestone,) Context(Erosion causes,List([0, 14))):(the river; to slice; )
Erosion causes,List([0, 14))
epochs of sandstone, shale and limestone Erosion the river
piled up causes to slice
the river to slice through the rock, revealing succeeding epochs of sandstone, shale and limestone,