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Southeastern Ohio was a swamp-covered coastal plain. [4] Ferns and horsetails were among the state's rich flora. [3] Ohio was only about 5 degrees north of the equator. Sand and mud deposited on local river deltas gradually filled in the swamp. Later in the Permian Ohio was subjected to geologic uplift and its sediments were eroded away ...
One delta laid down this rock formation in Michigan's Thumb peninsula. Several small deltas deposited Bedford Shale in Kentucky. A particularly large delta, known as the Red Bedford Delta, laid down a red-colored wedge of the shale in central Ohio. The climate of the late Famennian was mild, and much plant life grew along streams and rivers.
Ohio's State Invertebrate Fossil, is a trilobite found in the formation. The Southern Hemisphere where Ohio was located at the end of the Ordovician experienced a widespread glaciation, around 438 million years ago. Sea level dropped due to the glaciation, accompanied by a subsidence of the land.
A river delta is so named because the shape of the Nile Delta approximates the triangular uppercase Greek letter delta.The triangular shape of the Nile Delta was known to audiences of classical Athenian drama; the tragedy Prometheus Bound by Aeschylus refers to it as the "triangular Nilotic land", though not as a "delta". [8]
River deltas of the United States. Subcategories. This category has only the following subcategory. S. Sacramento–San Joaquin River Delta (4 C, 48 P)
Delta has a system of public schools known as the Pike-Delta-York Local School District. [11] This was the consolidation of the village school in Delta and the two surrounding township schools (Pike Township and York Township.) After the consolidation, Pike and York were closed, and the only remaining schools are in Delta.
A kame delta is a flat-topped landform of well sorted sand and gravel glaciofluvial sediments deposited by a meltwater stream into a body of water or river system. As such, kame deltas may be used to indicate a point of inflow into a body of water, such as a proglacial lake , even after that water has ceased to be present in a landscape. [ 25 ]
The formation is a part of the Queenston Delta clastic wedge, formed as an erosional response to the Taconic Orogeny. Lithologically, the formation is dominated by red and grey shales with thin siltstone, limestone and sandstone interlayers. As materials, comprising the clastic wedge, become coarser in close proximity to the Taconic source ...