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The North American land-mammal-age system was formalized in 1941 as a series of provincial land-mammal ages. [2] The system was the standard for correlations in the terrestrial Cenozoic record of North America and was the source for similar time scales dealing with other continents.
The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [3] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...
The geological timeline of Western North America includes significant geological events over millions of years in the evolution of Western North America, including several tectonic plate interactions involving the North American plate and leading to the formation of various mountain ranges and seaways.
The geologic turmoil on the west coast was maintained as the Pacific Plate continued to slide under the North American Plate. [133] During the early part of the Cenozoic period climates were much warmer than they are today. Latitudes as high as South Dakota had a subtropical climate until as recently as the end of the Oligocene. [134]
(Click to zoom) See legend below This is the legend for the North American geological map above. Geologic map of North America. The geology of North America is a subject of regional geology and covers the North American continent, the third-largest in the world. Geologic units and processes are investigated on a large scale to reach a ...
North America Sonoma orogeny.27 .24 North America Nevadan orogeny.2 North America Sevier orogeny.14 .05 North America Laramide orogeny.07 .04 North America Pasadena orogeny.03 North America Sleaford orogeny: 2.44 2.42 Oceania Glenburgh orogeny: 2 1.92 Oceania Barramundi orogeny: 1.89 1.85 Oceania Kimban orogeny: 1.84 1.70 Oceania Cornian ...
The division between Pennsylvanian and Mississippian comes from North American stratigraphy. In North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian and the Permian. In parts of Europe, the Mississippian and ...
Geologic time scale – System that relates geologic strata to time; Glacial history of Minnesota; Glacial period – Interval of time within an ice age that is marked by colder temperatures and glacier advances; Ice age – Period of long-term reduction in temperature of Earth's surface and atmosphere
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