Zoroaster Granite Is Older Or Younger Than Vishnu Schist

Zoroaster granite and vishnu schist at the bottom of the grand canyon we find rocks that formed during the precambrian two of which are the zoroaster granite and vishnu schist.

Zoroaster granite is older or younger than vishnu schist.

In general a granite is defined as an igneous rock that forms from the crystallization of magma while a schist is a metamorphic rock that forms when shale is subjected. Pre cambrian unconformity what surface separates the bass limestone and the tapeats. Approximately 2 billion years ago 25 000 feet of sediments were deposited and volcanics extruded onto the ancient sea floor. The grand canyon tells one of the world s greatest geologic stories.

Look at the relationship between the zoroaster granite and the vishnu schist. The vishnu basement rocks is the name recommended for all early proterozoic crystalline rocks metamorphic and igneous exposed in the grand canyon region they form the crystalline basement rocks that underlie the bass limestone of the unkar group of the grand canyon supergroup and the tapeats sandstone of the tonto group these basement rocks have also been called either the vishnu complex or. At the inner gorge of the grand canyon the vishnu schist and zoroaster granite are overlain by sedimentary rocks. The inner canyon has smaller beaches and is formed from igneous rocks such as vishnu schist and zoroaster granite.

Its distinctive features allow researchers to piece together the history of this unique location one of america s treasures and a unesco world heritage site. Vishnu schist and zoroaster granite. What name is applied to the surface separating the vishnu schist and the bass limestone be specific. A group of river runners set off from lee s ferry arizona on a 221 mile decent of the colorado river thru the geological time exposed thru erosion in grand canyon national park to diamond creek on the hualapi native american.

After settling into camp on the fourth day i scrambled up a wall of vishnu schist and zoroaster granite. Which relative age dating principle did you use to determine this relationship. The vishnu schist in the upper part of the gorge contains many pink pegmatite dikes. The boundary between the two different rock types represents a n.

The rocks of the vishnu formation predominantly mica schists are the oldest in the grand canyon. Which unit is older. Foliation is nearly vertical. The gray green walls of the vishnu schist are crisscrossed by dikes of granite.

Bed 2 is older than bed 4 but younger than bed 1. Is the zoroaster granite older or younger than the vishnu schist. Many units within the schist are well foliated and may appear similar to a gneiss. Older what is the oldest sedimentary rock.

Locally relict bedding can be seen indicating a sedimentary origin. Now that you are an expert in relative age dating take a careful look at figure 3. The beginning of the story starts at the bottom of the. The zoroaster granite is stratigraphically lower than the vishnu schist but it is younger than the schist.

Thinking of the geologic record as a book is helpful to understand each page of earth s history.