supported by the National Natural Science Foundation of China(41890843,41902007,and 41621003);the Natural Science Basic Research Plan in Shaanxi Province of China(2022JCDW5-01);the Program of Introducing Talents of Discipline to Universities(the 111 Project,D17013)。
Raindrop imprints,as an ephemeral structure on the surface of loose or semi-consolidated sediments exposed to air,are charac-terized by a central depression surrounded by an external rim.These imprints are useful in i...