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New laboratory experiments reveal that cohesionless turbidity currents are able to enter cohesive soft muddy substrates without losing their shape. These intrabed currents are driven by bed shear stress exceeding bed cohesive strength, and by flow density exceeding bed den - sity. The flows produce unique turbidites with internal mud layers, mixed cohesive-nonco - hesive sediment layers, and flame and load structures. A depositional model for intrabed (I) turbidites is proposed, comprising, from base to top: I1âsand-bearing mud, with a scoured base, dispersed mud, and mud clasts; I2âmuddy sand from the intrabed portion of the tur - bidity current; I3âsandy mud with a speckled appearance; and I4âmud-poor sand from the suprabed portion of the flow. Complete I1âI4 turbidites are inferred to dominate loca - tions in nature where the currents mix with the bed and deep erosional scours form, filled with deformed or chaotic sand-mud mixtures. Further downflow, base-missing I2âI4 and I4 sequences signify gradual deceleration, loss of erosivity, and termination of intrabed flo

Processes and products of turbidity currents entering soft muddy substrates