A compilation of metamorphic isograd sequences and their ages

This is a compilation of metamorphic field gradients and their ages compiled to evaluate secular change in metamorphic processes. Entries are classified by the presence of andalusite (and), staurolite (st), kyanite (ky), or sillimanite (sil) isograds. Six field-gradient categories are defined: \"and–sil\", \"and–st–sil\", \"st–sil\", \"triple-point\", \"ky-sil\", and \"ky\". The compilation is provided in \"isograd_compilation_v230105.xlsx\". A full reference list and explanatory notes are given in \"isograd_compilation_v230105_references.docx\".