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In the Permian geologic period, North-Central Texas was a part of the western coastal zone of equatorial Pangea, a super-continental land mass. [1] Nearby uplifts and mountainous regions, such as the Muenster Arch and Red River Uplift, the Wichita, Arbuckle, and Ouachita mountains developed by the end of the Pennsylvanian, [2] providing elevated topography to the north and east during the Permian.
The state's Ridge and Valley province is home to one of Pennsylvania's most profitable coal fields in history, containing high-grade anthracite coal. The sediments deposited during the Mississippian Period came from highlands located to the southeast. Waves of mountain-building occasionally brought coarser-grained sediments onto the plain.
The river is flowing on bedrock in the upper image, but because sediment was deposited over time the riverbed has risen. This has caused the house to be buried in the lower image. Aggradation (or alluviation ) is the term used in geology for the increase in land elevation, typically in a river system, due to the deposition of sediment.
Sea level rose even higher in this massive transgressive event, which helped form the 300–500 ft thick Austin Chalk, around ≈89-85mya. The Austin formation consists of recrystallized, fossiliferous, interbedded chalks and marls. Exposures of Austin chalk are mainly seen in quarries, roadcuts, and stream beds where the water eroded the top soil.
The rich alluvial soil along the creek was noted by surveyor Elias R. Wightman who was one of the Old Three Hundred. His report attracted Anglo-American settlers in the 1820s. Typically, Stephen F. Austin's colonists burned the canebrake to help enrich the soil. Sugar production became so successful that soon large homes were built so that one ...
Drought and intense heat have unearthed dozens of dinosaur tracks normally hidden under murky water and mud at a Texas park, photos show. Paul Baker, retail manager at Dinosaur Valley State Park ...
Fluvisol profile along Agula'e River, Ethiopia Distribution of Fluvisols. A fluvisol in the World Reference Base for Soil Resources (WRB) [1] is a genetically young soil in alluvial deposits. Apart from river sediments, they also occur in lacustrine and marine deposits. [2] Fluvisols correlate with fluvents and fluvaquents of the USDA soil ...
Edison power plant in Williamsport, Maryland, after the March 18, 1936 flood, surrounded by water from the Potomac River. The facility later became the R. Paul Smith Power Station.