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=**__//Burrows//__**= A burrow is a type of endogenic trace fossil which provides geological evidence of biological activity within the sediment after deposition. Burrows are used by animals as a form of refuge and are commonly found in sedimentary rocks. Burrow morphologies are extremely diverse. Burrows become fossilized when fine sediment from a river or other body of water overflow into a burrow and form hard casts around the burrow before another layer of sediment develops.
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Burrows can provide information regarding the consistency of the sediment at the time of its deposition and the energy level of the depositional environment. =__//**Paleosols** //__= = = = = A paleosol is a layer of fossilized soil submerged beneath layers of sediments or volcanic deposits.
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Paleosols are significant because they give information about the depositional environment of the soil. By sampling paleosols and comparing them to current soils and conditions, environment and climate change can be determined. =__//﻿//__= =__//**Load Casts** //__=
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**//Description //** Load casts are deformational structures that occur due to inverted density layering. Low density water-saturated sediment is buried swiftly by coarser high density sediment and the weight of the overlying sand sinks disproportionately into the lower density sediment. This causes swellings, minor bulges, entwined outgrowths, rounded sacks or irregular protrusions. Load casts range in size and can occur in a variety of depositional environments but are most common in turbidites where liquefaction occurs. **//Significance //** Load casts are most commonly asymmetrical and irregular without current or up-section indicators. However, flame structures in the bottom layer will sometimes form and can indicate the direction of movement in uncommon symmetrical load casts. Load casts are significant in terms of depositional environments because they show signs of forceful activity in the sediments before they were lithified. For example, liquefaction can occurr during an earthquake resulting in the formation of load casts. The depostional environment of these load casts are of great importance to seismologists.