Dikes are tabular intrusions that cut across sedimentary layers and other rocks. Sills squeeze in between layers. Stocks and batholiths are large intrusions that may be miles across and miles deep. Stocks are exposed over an area of less than 100 square kilometers, while batholiths are larger. Composite batholiths are aggregates of numerous batholiths and stocks that cover a vast region. The Sierra Nevada batholith is an example.

Dikes and Sills
Dike near Lake Mead, Arizona	Dike near Lake Mead, Arizona	Close up of margin of dike, Lake Mead, AZ	Pegmatite Dike, San Bernardino Mountains, CA	Basalt dike in cinder cone near Williams, AZ	Basalt dike in cinder cone near Williams, AZ
Sill on coast of Isle of Skye, Scotland	Stirling Castle, built on a dike, Scotland	Stirling Castle, built on a dike, Scotland	Hutton's sill at Salisbury Crags, Edinburgh, Scotland	Dasses Sill, Edinburgh, Scotland	Hutton's sill, Salisbury Crags, Edinburgh, Scotland
Dikes in granitic rock, Kings Canyon National Park	Dike in Inyo Mountains, Inyo County, CA	Mafic dike in Pine Creek Canyon, Sierra Nevada, CA	Mafic dike near Darwin Falls, Death Valley National Park	Basalt dikes in Furnace Creek Formation, Death Valley National Park	Basalt dike in Furnace Creek Formation, Death Valley National Park
Devils Backbone, a dike exposed in the walls of Crater Lake, Oregon	Granite dikes at the Painted Wall in Black Canyon of the Gunnison in Colorado	Granite dikes at the Painted Wall in Black Canyon of the Gunnison in Colorado

Stocks and Batholiths
Castle Crags stock, Klamath Mountains, CA	Castle Crags stock, Klamath Mtns, Dunsmuir, CA	Contact of Sierra Nevada batholith with country rocks, Pine Creek, CA	Central Sierra Nevada, showing batholith and Long Valley Caldera	Large exposure of batholith, Clouds Rest, Yosemite National Park	East wall, El Capitan, Yosemite Valley, contact zonex of plutons
"North America pluton" on El Capitan, Yosemite Valley	Intrusive contacts on El Capitan, Yosemite Valley	Granite contact detail, Guadalupe Mtn, Sierra Nevada foothills	Granite contact, Guadalupe Mtn, Sierra Nevada foothills	Sierra Nevada batholith, Little Yosemite Valley	Batholith contact zone, Hetch Hetchy, Yosemite National Park
Roof of granitic magma chamber at Joshua Tree National Park
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