-Bed thickness: Depositional episodes of varying sizes
-Color = Formed on land or in the water
-Clast size = Distance of transportation
Fossils are formed on land or in water, depending on the climate.
-Cross beds = Wind or water current direction
Sedimentary rocks are constructed from pre-existing rocks or remains of extinct creatures. They emerge from deposits that amass on the Earth's surface. Identifiable bedding or layering is typically present in sedimentary rocks.
Mesas and arches built of stratified sedimentary rock may be seen in many of the desert southwest's attractive landscapes.
Common sedimentary rocks include sandstone, limestone, and shale. These rocks frequently begin as sediments that are transported by rivers, then are dumped in lakes and seas. The sediments become dry and cement together to create rock when they are buried. Volcanic ash can be found in tuffaceous sandstones.
When a lot of living creatures die, biological sedimentary rocks are formed. This is one of the ways limestones may develop, and chert is an example of this kind of rock. Limestone can also form by precipitating directly out of the water.
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