The　field　of　cohesive　and　noncohesive　mixture　erosion　is　not　fully　understood　because　of　the　numerous　factors　that　influence　soil　erodibility.　In　this　study,　erosion　experiments　were　conducted　on　mixtures　of　gravel　and　silty　clay　in　proportions　varying　from　0%　to　100%　by　weight.　The　critical　shear　stress　of　erosion　and　the　erosion　rate　were　quantified　using　an　erosion　function　apparatus　(EFA).　Experimental　data　revealed　that　the　mixture　critical　shear　stress　first　decreased　and　then　increased　with　an　increasing　cohesive　fraction　for　mixtures　with　silty　clay　contents　up　to　50%.　The　critical　shear　stress　of　the　mixture　showed　an　increasing　trend　as　the　silty　clay　content　varied　from　60%　to　100%.　A　transition　from　noncohesive　to　cohesive　erosion　behavior　occurred　at　silty　clay　contents　between　30%　and　35%.　The　appropriateness　of　a　dimensionless　nonlinear　excess　shear　stress　model　and　the　Wilson　model　was　tested　based　on　the　EFA　experimental　data.　The　dimensionless　excess　shear　stress　model　was　shown　to　be　appropriate　for　noncohesive　mixtures,　while　the　Wilson　model　performed　better　than　the　dimensionless　excess　shear　stress　model　for　cohesive　mixtures.