facies
Noun
Meaning
The anterior part of the head; the face.
The general aspect or habit of a species, or group of species, esp. with reference to its adaptation to its environment.
The face of a bird, or the front of the head, excluding the bill.
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For an overview over facies shifts and the relations in the sedimentary rock record by which they can be recognized, see Reading (1996), pp. 22–33.
In the case of transgression, deeper marine facies are deposited over shallower facies, a succession called onlap.
; Sedimentary facies : On a longer time scale, the rock record may show signs of sea level rise and fall, and features such as "fossilised" sand dunes can be identified.
Coral for example only lives in warm and shallow marine environments and fossils of coral are thus typical for shallow marine facies.
Garnets are also useful in defining metamorphic facies of rocks.
In the subsurface, such geographic shifts of sedimentary environments of the past are recorded in shifts in sedimentary facies.