Any sedimentary rock, when metamorphosed, can show the original layering if the metamorphosis isn't too drastic. The process is usually not sudden in a geologic sense. read more
Any sedimentary rock, when metamorphosed, can show the original layering if the metamorphosis isn't too drastic. The process is usually not sudden in a geologic sense. read more
Foliated metamorphic rocks such as gneiss, phyllite, schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure. Non-foliated metamorphic rocks such as hornfels, marble, quartzite, and novaculite do not have a layered or banded appearance. read more
Non-foliated metamorphic rocks are rocks that have been changed by heat and pressure into rocks with a non-layered or banded appearance. Some examples of non-foliated metamorphic rocks include quartzite, marble, amphibolite and hornfels. read more