fa·ci·es / ˈfāˌshēz; ˈfāshēˌēz/ • n. (pl. same) 1. Med. the appearance or facial expression of an individual that is typical of a particular disease or condition.2. Geol. the character of a rock expressed by its formation, composition, and fossil content.

facies
1. Sum total of features that reflect the specific environmental conditions under which a given rock was formed or deposited. The features may be lithologic, sedimentological, or faunal. In a sedimentary facies, mineral composition,sedimentary structures, and bedding characteristics are all diagnostic of a specific rock or lithofacies.

2. See METAMORPHIC FACIES.

facies (fay-shi-eez) n. facial expression, often a guide to a patient's state of health as well as his emotions. adenoid f. the vacant look, with the mouth drooping open, seen in adenoids. Hippocratic f. the sallow face, sagging and with listless staring eyes, that some read as the expression of approaching death.

facies In geology, all the features of a rock or that show the history of its formation. Geologists often distinguish age by facies. The term is also applied to gradations of igneous rock.

facies
1. Aspect or appearance.

2. The sum total of the features that reflect the specific environmental conditions under which a given rock was formed or deposited.