The correct answer is Palynology.
Palynology refers to the study of particles or dust that are scattered. A palynologist examines particulate samples gathered from water, air, or from deposits including sediments of any age. The identification and condition of those particles, inorganic or organic provide the palynologist with the clue to the environment, life, and energetic conditions that originated them.
It is the branch that deals with the contemporary and fossil palynomorphs, like spores, pollen, and others, in combination with the kerogen and the particulate organic matter found in the sediments or the sedimentary rocks.