The Most Extensive Granitic Rock

1 granitic and 2 metamorphic rocks of the coast and cascade mountains.

The most extensive granitic rock. Volcanic intrusions 4 fill fractures within granitic metamorphic and sedimentary rocks. The bedrock geology of yosemite national park consists almost entirely of granitic rocks. They occur in smaller bodies at numerous sites in british paleogene and neogene rocks and in the oslo region of norway but their most extensive development is in northern nigeria. It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth.

Most certainly ohio has an extensive well preserved record of events and life during portions of the very last part of the cenozoic the pleistocene and holocene. Granites with a great excess of alkali feldspar over plagioclase are known from new england. Most introductory geology textbooks report that granite is the most abundant rock in the continental crust. The granites formed at depth within a volcanically active mountain range comparable in geologic setting to the andes chain in south america.

But more than 60 million years of cenozoic history is missing along with the hordes of mammals that must have roamed the state. Probably the most extensive area occurs along the north and east shores of georgian bay in ontario where granitic rock forms roughly 80 miles 140 km of shoreline chapman and putnam 1984 catling and brownell 1999 but other areas occur along ontario s lake superior shoreline as well as seen at pukaskwa national park and neys and lake superior provincial parks. The most extensive are. Overlying these within the fraser valley is a thick sequence of 3 sedimentary rock sandstone and shale.

Granite is an intrusive igneous rock which means it crystallized from molten rock called magma miles underground. Granite in the continental crust. At the surface granite is exposed in the cores of many mountain ranges within large areas known as batholiths and in the core areas of continents known as shields.