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Image:Map of USA-bw.png – Black and white outlines for states, for the purposes of easy coloring of states. Image:BlankMap-USA-states.PNG – US states, grey and white style similar to Vardion's world maps. Image:Map of USA with county outlines.png – Grey and white map of USA with county outlines.
The Ordovician (/ ɔːr d ə ˈ v ɪ ʃ i. ə n,-d oʊ-,-ˈ v ɪ ʃ ən / or-də-VISH-ee-ən, -doh-, - VISH-ən) [9] is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon.
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Although the name Vinini is used extensively, the Palmetto Formation in southern Nevada is of the same age and lithic composition and merits the name Vinini. [2] Originally the Vinini was considered to be wholly of Ordovician age, but the unit designated as Vinini on many published maps includes, at the top, a massive chert unit, the Cherry Spring chert, now known to be of Early Silurian age. [3]
The Darriwilian is the upper stage of the Middle Ordovician.It is preceded by the Dapingian and succeeded by the Upper Ordovician Sandbian Stage. The lower boundary of the Darriwilian is defined as the first appearance of the graptolite species Undulograptus austrodentatus around 469.4 million years ago.
Stratigraphic range: Early Ordovician stage Ordovician period: Type: Geologic group: Sub-units: Antelope Valley Limestone Ninemile Formation Goodwin Limestone [1] Underlies: Copenhagen Formation: Overlies: Windfall Formation: Location; Region: Nevada Utah: Country: United States: Type section; Named for: Pogonip Ridge, White Pine County, Nevada ...
The Katian is the second stage of the Upper Ordovician. It is preceded by the Sandbian and succeeded by the Hirnantian Stage. The Katian began 452.8 million years ago and lasted for about 7.6 million years until the beginning of the Hirnantian 445.2 million years ago. [7] During the Katian the climate cooled which started the Late Ordovician ...
South of the Brigantes, the geographer Ptolemy reported three tribes whose territories stretched from the Irish Sea to the North Sea. The Ordovices occupied the westward lands and had two noteworthy cities, Branogenium which was located 195 Roman miles from London, most likely at Leintwardine, and Mediolanum which was located 200 Roman miles from London.