Activity of the Cascadia Fault is what had triggered the activity of St Helens in 1980 and in 2004. The Cascadia fault is a convergent plate boundary. The fault is a described as long and slopping, it starts in Northern Vancouver Island and expands down to Northern California. The Cascadia fault line separates the Juan de Fuca plate and the North American plate. Tectonic processes active in the Cascadia subduction zone region include accretion, subduction, deep earthquakes, and active volcanism of the Cascades.
Geologists have found that the oldest exposed rocks in the national park to date back to 75 million years. The formations resulted from sediments that were largely swept into the area due to the rise of the Rocky Mountains. This eventually resulted in a rising of land above sea level. The deposits consisted of different strata of dark shale beds, many containing fossils of marine life from the Seaway (Stoffer 2003). Pierre shale is a formation of marine origin from the Cretaceous period that resulted from the Western Interior Seaway.
My overall experience was excellent. During our first stop at a region that was site of the San Fernando Earthquake, we had the opportunity to know the major factor of the San Fernando Earthquake. I learned about the magnitude of the earthquake as well as the type of fault that was associated. On our second stop at the Placertia Canyon, we leaned material about Francisco Lopez discovery of gold in the Placertia Canyon; however, his gold rush only lasted six years. In our third stop at the San Gabriel Mountains Anorthosite, we learned material about the anorthosite intrusive igneous body that cooled 1.2 billion years ago.
Caroline Burns 159001444 Museum Assignment 2 3) Basalt is an igneous and mafic rock that compromises most of the volcanic rocks. It is dark black and gray colored. It is rough and has an uneven rectangle-box shape. Basalt is from Somerset and is four point two billion years of age. Basalt is mostly composed of augite, plagioclase and olivine.
When the layers of the Earth move it causes the tectonic plates (aka: plate tectonics) to move which causes the Alaskan Way Viaduct to collapse. The layers of the Earth are the inner core, outer core, mesosphere, asthenosphere, upper rigid mantle, oceanic crust, and the continental crust. The Density Column lab showed how things can have different densities like the layers of the Earth. It also showed how things that are most dense stay more towards the bottom and least dense stuff stays more towards the top. The Density
Beaches are sand, and sand comes from quartz, which is one of the hardest and most plentiful minerals on the planet. This sand was made when the ice sheet would expand and retreat picking up chunks of rocks, and mineral crushing them together effectively making a grinder in the glaciers innards (DNR). Sometimes these rocks and minerals are carried hundreds of miles before being deposited onto the ground. Michigan has a unique coastal landscape dotted with beaches and pine forest, but one thing that Michigan has; that not many places around the world have is bluffs. According to the National Geographic, a bluff is a small, rounded cliff that usually overlooks a body of water, or where a body of water once stood.
Splendid but Sorrowful Indian Land: Navajo Nation Have you ever visit Native Indian territory? On last April, my family and I traveled at Navajo Indian Reservation. It is the largest Native American territory, occupying portions of northeastern Arizona, southeastern Utah, and northwestern New Mexico in the United States. In that territory, there are two spectacular sightseeing points, Monument Valley and Antelope Canyon. Monument Valley is the region of the Colorado Plateau characterized by a cluster of vast sandstone buttes and Antelope Canyon is a slot canyon was formed by erosion of Navajo Sandstone primarily due to flash flooding and secondarily due to other sub-aerial processes.
I decided not to climb up the seamount because I was still weary of the possibility of there being an eruption and I continued on my way. While walking from the Bear Seamount, I came across the Mid-Atlantic Ridge (38.7691,-30.96474). Commonly called MAR for short, the ridge is the longest mountain range in the world. It was formed by the tectonic plates diverging. Through this rift, magma rises from the mantle and erupts as lava to produce new crust material on the torn edges of the tectonic plates.
The history, great rocks, flora and fauna, and awesome activities are what make Yosemite National Park such an amazing place. The unique geology of Yosemite was set in its place more than a five hundred million years ago. Its spectacular mountains, El Capitán and Half Dome, are two of the world 's most famous rock climbing spots. The plants and animals that dwell in the beautiful forest are each unique in different ways. There are many activities that are offered to visitors of Yosemite, providing all of them with a memorable experience.
There is also evidence of volcanic activity around the area in the form of craters stemming from Pinacate, an extinct volcano (9). Mud volcanoes, which release hot water, mud, and steam, are also evident in the area (9). Some important elements have been discovered in the region including sulphur deposits, sodium carbonate, and even gold (9). Changes in the course of the Colorado river have caused certain channels to dry up and shifts in the river-bed have probably taken place over the past centuries (9). Besides the ever changing land formation, the area itself is constantly dry (9).
The Cordell formation is the uppermost member of the Manistique group. The Cordell member is a Silurian aged dolomite deposited within the The Manistique The Manistique group is approximately 60 meters of varying dolostones. The lower group, the Schoolcraft member, can be distinguished from the Cordell by its massive and crystalline texture. Additionally, the Schoolcraft unit was deposited following a lull and drop in regional sea level as indicated by the massive erosional structure found at the base of the member (Ehlers, 1973). In his paper, Sloss observes three major unconformities within the basin that coincide with the eustatic transgressions.
The Axial Seamount is located next to the Juan de Fuca Ridge, but on the Juan de Fuca Plate. The Juan de Fuca Ridge is a mid-ocean ridge. The Axial Seamount was formed by the many earthquakes that kept happening in that area. In a three day span of all the earthquakes, the sea floor dropped over 2.4 m. They can also be created by divergent bonds by the sea spreading apart. Axial Seamounts are submarine volcanoes.
Jewel Cave is located in the Black Hills of South Dakota. The Black Hills were formed during the Tertiary Lamanide Oroginy. (See Figure 2 and 7). The Black Hills are doubly asymmetrical anticlines that are plunging to form a dome. Two rock types are from the Tertiary and the Quaternary period and are starting to intrude into the older rock types.
In the beautiful Almaden Lake, a popular San Jose city park off Almaden Expressway, has fish that have the highest concentrations of mercury contamination in California. Based of new state studies. There are four other lakes in Santa Clara County Anderson, Uvas, Calero and Chesbro reservoirs ,rank with the top 20 lakes with fish have the highest mercury concentrations. Almaden Lake is a 66-acre park off the Almaden Expressway. It originated in the 1940s as a rock quarry on Los Alamitos Creek.
Yellowstone experiences many natural disasters such as volcanic eruptions, steam explosions, and earthquakes; I am going to focus on the volcanic eruptions and lava flows. Yellowstone lava eruptions were nearly 600,000 years ago, 30 eruptions of rhyolitic lava flows filled the Yellowstone Caldera. The rhyolitic lava is really thick and covers a large portion of Yellowstone. There have only been three eruptions from the Yellowstone Super volcano: 2.1 million years ago, 1.2 million years ago, and 640,000 years ago. The last eruption 640,000 years ago caused Yellowstone to collapse creating a sunken giant crater or caldera (Florian Herrmann,2013).The magmatic heat from that eruption still powers the geysers, hot springs, and mud