________ is a nonfoliated rock formed by the contact metamorphism of fine grained rocks like shales, mudstones, or volcanics.
A large block of sedimentary rock that has fallen into the top of a magma chamber and become metamorphosed is called ________.
B)an inverted aureole
C)an amphibolite boudin
D)a roof pendant
Which rock forms by contact metamorphism of fine grained mudstones, shales, and volcanics?
A massive mudstone metamorphosed to biotite hornfels facies would have ________.
A)biotite defining wavy parallel foliations throughout the rock
B)breccia of angular biotite clasts crushed and sheared out of shape
C)irregular spots of randomly oriented biotite platelets called porphyroblasts
D)remnants of biotite, now mostly recrystallized to garnet in discreet layers