Stock (geology)
In geology, a stock is an igneous intrusion that has a surface exposure of less than, differing from batholiths only in being smaller. A stock has a discordant relationship with the rocks that it intrudes. Many stocks are cupolas of hidden batholiths. Some circular or elliptical stocks may be volcanic plugs, which fill the vents of now extinct volcanoes.
A boss is a small stock.
Examples
- the Alta and Clayton Peak stocks, near Park City, Utah
- the Hellroaring Creek and Salal Creek stocks in British Columbia, Canada
- the Céret stock in Pyrénées-Orientales, France
- the Parashi stock in La Guajira Department, Colombia
- stocks of syenite in the Caldera de Tejeda on Gran Canaria
- Ailsa Craig granitic boss, which forms a volcanic plug, in Scotland