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In rheology, Byerlee's law, also known as Byerlee's friction law concerns the shear stress (τ) required to slide one rock over another. The rocks have macroscopically flat surfaces, but the surfaces have small asperities that make them "rough." For a given experiment and at normal stresses (σn) below about 2000 bars the shear stress increases approximately linearly with the normal stress and is highly dependent on rock type and the character (roughness) of the surfaces, see Mohr-Coulomb friction law. Byerlee's law states that with increased normal stress the required shear stress continues to increase, but the rate of increase decreases, where τ and σn are in units of MPa, and becomes nearly independent of rock type. The law describes an important property of crustal rock, and can be used to determine when slip along a geological fault takes place.