Tonalite at Deer Creek of Day and Bickford
Tonalite at Deer Creek of Day and Bickford
2004) (Early Jurassic, ~177 Ma
Hypabyssal tonalite. This unit includes the tiny outcrop area of the tonalite at Deer Creek which has a zircon U-Pb age of ~179 Ma (Day and Bickford, 2004; supersedes the widely cited age of ~198 Ma in Edelman and others, 1989). The tonalite at Deer Creek is interpreted as the youngest part of the Slate Creek terrane (unit YSSS) wall rock into which the Smartville Volcanic complex plutons were emplaced.