Map of the Rocky Mountain region showing relation of Precambrian-cored . Long, linear anticlines with cores of salt are found in the Eagle and Carbondale areas of central Colorado. Within these large folds are many small, tight folds that were formed during an earlier period of folding and were refolded by the second period, shown in the photo to the right. There is an interactive map application to view the faults online and a separate database search function. AGE is the upper bounding time of the most recent surface-deforming earthquake. Studying these areas, geologists discovered that the missing strata were indeed deposited at Red Rocks and then later removed by erosion during an uplift associated with mountain building.Similar nonconformities are also exposed in other places in Colorado. In some cases, it is possible to evaluate how frequently large earthquakes occurred on a specific fault during the recent geological past. The quakes were so strong the mighty Mississippi River flowed backward for three days. The steeply dipping Precambrian strata were originally deposited as horizontal layers and then buried. Earthquakes are caused by a sudden movement of the earth along a fault. With our current state of knowledge, it is not possible to predict when or where, the next large earthquake might occur in Colorado.Faults are classified based on the relative movement of each side of the fault with respect to the other side. The active landscape of the state — with the still-rising mountains containing thousands of faults — features over 90 potentially active faults and more than 700 recorded earthquakes of magnitude 2.5 or higher since 1867. Paleoseismic studies help with this understanding. A thrust fault, such as the Williams Range fault bounding the west side of the Front Range, is a special case of a reverse fault where the dip of the fault plane is thirty degrees or less.Because the interval between large earthquakes on any given fault is often in the neighborhood of hundreds or even thousands of years, it is necessary to study when large earthquakes have occurred on the faults in the past to better understand their potential future behavior. Later, the layers tilted and folded to a vertical position during a mountain building event and were eventually eroded and truncated. “Mountain building episodes throughout Colorado’s history created geologic structures that are beautifully exposed across the state. In the Black Canyon of the Gunnison and Colorado National Monuments, sedimentary rocks rest nonconformably on igneous and metamorphic rocks with a gap of 1.5 billion years.In the angular unconformity pictured left, conglomerate overlies dipping shale in Little Snake Canyon.

As the rocks on either side of the fault accumulate stress between them, they will eventually overcome friction and slip. Colorado has every kind of fold and fault known to geologists.Unconformity is the general term for missing pages of Earth history. If the rocks move after they break, the fracture becomes a fault. Nonconformity (middle) is an erosional surface separating igneous or metamorphic rocks below from sedimentary strata above. Smaller events, in the range of magnitude 5.0-5.5 occur more frequently, perhaps with a reoccurrence on the order of decades.In addition to potential movement along the Front Range, seismic activity also occurs in the volcanic formations on the northwest corner of the park. uplifts to basement faults of the Trans–Rocky Mountain fault system.....3 2. For the hazard maps, both the fault surface trace and the metadata are simplified representations of the geometry and behavior of the fault, based on geologic interpretation.

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Ramapo Fault Zone. Thanks for contacting us. 1. The CGS conducts scientific studies of fault zones and past earthquakes while monitoring fault movements with a network of seismometers throughout Colorado.Three faults in Colorado have received sufficient study to be included in the The latest recording traces from some of our seismic stations (the trace images are refreshed:Colorado Division of Homeland Security and Emergency Management –The Earthquake Reference Collection is a comprehensive library of Colorado-specific reports, maps, documents, and papers examining the geoscience behind earthquakes and faulting around the state. uplifts to basement faults of the Trans–Rocky Mountain fault system.....3 2. Fault Line 1 10.3 Left Fault Line 2 10.5 Left Mee Corner 12.7 Left Mee 1 13.1 Left Mee 2 13.2 Left Mee 3 13.3 Left Mee 4 13.4 Left M eCa nyo 13.6 L ft Dog Island 14.7 Left pli tRock 15.8 Lef Bla ckRo s 16 Left Black Rocks 2 16.1 Left Bla ckRo s 3 16.2 Left Black Rocks 4 16.4 Left Black Rocks 5 16.5 Left Bla ckRo s 61 .

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