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If the top of a dome has been eroded flat, the resulting structure in plan view appears as a bullseye, with the youngest rock layers at the outside, and each ring growing progressively older moving inwards. These strata would have been horizontal at the time of deposition, then later deformed by the uplift associated with dome formation. [1] [2]
The Central Basin was caused by an uplifting which produced a dome known as the Nashville Dome. The Nashville Dome is evidenced by the underlying rock strata that all dip downward away from Nashville. The uplifting of the Nashville Dome fractured overlying strata, making it more easily eroded, and thus the "dome" resulted in a "basin".
A laccolith is a body of intrusive rock with a dome-shaped upper surface and a level base, fed by a conduit from below. A laccolith forms when magma (molten rock) rising through the Earth's crust begins to spread out horizontally, prying apart the host rock strata. The pressure of the magma is high enough that the overlying strata are forced ...
The geographic cycle, or cycle of erosion, is an idealized model that explains the development of relief in landscapes. [1] The model starts with the erosion that follows uplift of land above a base level and ends, if conditions allow, in the formation of a peneplain . [ 1 ]
Again, the cemented sediments would resist erosion while the surrounding terrain is eroded away to create a ridge or hill. [1] [2] Erosion of the resistant upper strata of the anticlines of a folded region, exposing less resistant underlying strata, which then erode relatively rapidly leaving the syncline as the top of a mesa or ridge. [4]
A newer theory of pavement formation comes from studies of places such as Cima Dome, in the Mojave Desert of California, by Stephen Wells and his coworkers. At Cima Dome, geologically recent lava flows are covered by younger soil layers, with desert pavement on top of them, made of rubble from the same lava. The soil has been built up, not ...
Rock's house, valued at $5.6 million, is seen in the vi About 70% of the county's 47 miles of coastline is considered "critically eroded," according to Palm Beach Country's Department of ...
Headward erosion is a fluvial process of erosion that lengthens a stream, a valley or a gully at its head and also enlarges its drainage basin. The stream erodes away at the rock and soil at its headwaters in the opposite direction that it flows. Once a stream has begun to cut back, the erosion is sped up by the steep gradient the water is ...