Large rounded gravel in presence of fine grain or course grains particles are conglomerate
conglomerat is a type of sedimentary rosk.
contains rounded pebbles, greater than four mm.
Grinned up cement
Conglomerates are sedimentary rocks where a fine grained matrix contains a large number of larger rounded pebble or rock sized clasts. These clasts are frequently pebbles made up from a variety of...