https://digitalcommons.usf.edu/geo_facpub/956/
"Mineralogic Domains in Very Low-Grade Pelitic Rocks" by Thomas C. Juster
Carbonaceous pelites from northeastern Pennsylvania that have undergone very low grade metamorphism during the Allegheny orogeny contain domains (approximately...
https://plate-tectonic.narod.ru/metlowpphotoalbum.html
Low-Pressure Metamorphism of Pelitic Rocks
low pressuremetamorphismrocks