Basic Structure: Bedding in sedimentary rocks

As the dune continues to form and advance sand from the top is moved by down the slope, eroding the old top of the dune slope. So over time a sedimentary deposit is created with inclined surfaces bounded on the top by an erosion surface. We can recognise this in the rock record as cross-bedding. The erosion surfaces represent the principal bedding planes and these are continuous.…

STRATA Terminology

The sedimentary "bed" is the basic unit,or fundamental building block of stratigraphy (Campbell, 1967). The lithologic composition of bed s, their geometry, their trajectory , stacking patterns and hierarchies are used to interpret their depositional setting.…

Sedimentary Rocks Revision World

Sedimentary rocks are laid down in layers called beds or strata. Each new layer is laid down horizontally over older ones. There are usually some gaps in the sequence called unconformities. These represent periods in which no new sediments were being laid down, or when earlier sedimentary layers were raised above sea level and eroded away. Sedimentary rocks contain important information about the ……

What are sedimentary rocks? - USGS

Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding. Many of the picturesque views of the desert southwest show mesas and arches made of layered sedimentary rock.Common Sedimentary Rocks:…