One of the sources from which evidence concerning past climates can be obtained. For example, glacial, periglacial, and pluvial deposits provide morphological information related to climate; cave deposits, dunes, and dunefields yield lithologic information; and plants (including pollen), molluscs (Mollusca), foraminifera (Foraminiferida), beetles, and ostracods (Ostracoda) are among the organisms that have been used to derive biotic information.