Folk Classification
Robert L. Folk developed a classification system that places primary emphasis on the detailed composition of grains and interstitial material in carbonate rocks. Based on composition, there are three main components: allochems (grains), matrix (mostly micrite), and cement (sparite). The Folk system uses two-part names; the first refers to the grains and the second is the root. It is helpful to have a petrographic microscope when using the Folk scheme, because it is easier to determine the components present in each sample.
Read more about this topic: Limestone, Classification
Famous quotes containing the word folk:
“An’ when the earth’s as cauld’s the mune
An’ a’ its folk are lang syne deid,
On coontless stars the Babe maun cry
An’ the Crucified maun bleed.”
—Hugh MacDiarmid (1892–1978)