 The pluton is composed primarily of megacrystic biotite monzogranite and lesser amounts of megacrystic biotite granodiorite.Contacts between the primary biotite monzogranite and the slates and greywackes of the host rocks are ubiquitously sharp and intrusive.Numerous small bodies (Stevens, G, I Spooner, J Morrow, P Pufahl, R Raeside, RAF Grieve, CR Stanley, SM Barr, and D McMullin (2008) "Physical evidence of a late-glacial (Younger Dryas?)