These rocks often yield biotite hornfels under conditions of contact metamorphism, and can form phyllite or schist in extreme conditions.
At the extreme end of the Barrovian metamorphism this rock will mostly consist of kyanite or sillimanite minerals. These rocks often yield biotite hornfels under conditions of contact metamorphism, and can form phyllite or schist in extreme conditions. The Maotianshan deposit of this rock in China holds many fossils of the ancient phylum Vetulicolia. They exhibit a high degree of fissility and differ from siltstones in their lack of cross-bedding and cut-and-fill structures. The oil type contains kerogen which can yield petroleum gas upon distillation, and the Burgess deposits in Canada hold a wealth of important fossils. Made of compacted clays or muds, FTP, name this sedimentary rock whose metamorphic counterpart is slate.
At the extreme end of the Barrovian metamorphism this rock will mostly consist of kyanite or sillimanite minerals.
shale