Characteristics of pebble and cobble-sized clasts along the Curiosity rover traverse from sol 100 to 750: Terrain types, potential sources, and transport mechanisms

•We characterize clasts to interpret rock sources, transport history, and terrain.•Clasts were classed into ten types; nine types are sedimentary rocks.•Most clasts indicate nearby outcrops or prior presence of sedimentary rock layers.•Type 3 clasts were likely transported fluvially, then worn out of pebbly sandstone.•Orbital data can predict only certain end-member terrain types.