These sedimentary rocks are formed from ancient sea deposits. The fossils found in the rocks help geologists determine the age of the rocks.
Sedimentary rocks may be porous. These spaces allow metal-rich fluids to migrate through the rock and deposit the metallic minerals.
Coal deposits are formed from plant remains that have been subjected to pressure and temperature when buried at depth beneath the surface.
Sedimentary rocks are softer and more easily eroded than volcanic or granitic rocks. Water, wind and ice have sculpted the beautiful landscapes and majestic waterfalls that we enjoy as NWT residents and that tourists come to visit.