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The "Taconic Unconformity" is an angular unconformity exposed from eastern New York State to the Gaspe peninsula. As the Taconic orogeny subsided in early Silurian time, uplifts and folds in the Hudson Valley region were beveled by erosion. Upon this surface sediments began to accumulate, derived from remaining uplifts in the New England region.
Taconic orogeny. Algoman orogeny, also known as Kenoran orogeny – Late Archaean episode of mountain building in what is now North America – Superior province, South Dakota to Lake Huron, late Archean Eon (2700–2500 Ma) Wopmay orogeny – Mountain-building event in northern Canada – Along western edge of Canadian shield, (2100–1900 Ma)
The last mountain building event, the Laramide orogeny, (about 70-40 million years ago) the last of the three episodes, is responsible for raising the Rocky Mountains. [12] During the last half of the Mesozoic Era, the Age of the Dinosaurs, much of today's California, Oregon, and Washington were added to North America.
In the west, the Iapetus Ocean closed with the Taconic orogeny (480-430 million years ago), when the volcanic island arc collided with Laurentia. Some authors consider the oceanic basin south of the island arc also a part of the Iapetus, this branch closed during the later Acadian orogeny, when Avalonia collided with Laurentia. [citation needed]
It was deposited in a deep marine setting in a foreland basin during the Taconic orogeny. [2] Its sediment source was mainly the erosion of preexisting sedimentary rocks. [ 2 ] Graptolite fossils place it in the stratigraphic zones of Nematograptus gracilis and Climacograptus bicornis , but its age could be Llandeilo or Trentonian (earliest to ...
The Taconic Unconformity, near Catskill, NY. The Taconic unconformity is a major unconformity created during the Taconic orogeny, exposed from eastern New York State to the Gaspe peninsula. [1] The orogeny was a long one that comprised multiple bursts; it primarily dated to the end of the Ordovician, and the underlying rocks are primarily this age.
Clay shed from the rising mountains, associated with the Taconic orogeny formed the shale units. The warm sea water created perfect conditions for abundant biological activity and the Cincinnatian Series is highly fossil-bearing, outcropping across much of southwest Ohio in river beds, hillsides and road cuts.
The Atlantic Seaboard Fall Line, or Fall Zone, is a 900-mile (1,400 km) escarpment where the Piedmont and Atlantic coastal plain meet in the eastern United States. [2] Much of the Atlantic Seaboard fall line passes through areas where no evidence of faulting is present.