In this article, we delve into the fascinating world of Dresbachian, exploring its multiple facets, its impact on society, its evolution over time and its relevance in the current context. From its origins to the present, Dresbachian has played a fundamental role in various areas, generating debates, reflections and emotions among those who have experienced it. Through a detailed analysis, we will examine its influence on different cultures, its importance in history and its projection into the future. It doesn't matter if Dresbachian is a person, a topic, a date or any other element, because its meaning transcends borders and opens endless possibilities to understand its essence and its impact on the world around us.
Dresbachian | |
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Usage information | |
Celestial body | Earth |
Regional usage | Regional |
Time scale(s) used | North American |
Definition | |
Chronological unit | Age |
Stratigraphic unit | Stage |
The Dresbachian is a Maentwrogian regional stage of North America, lasting from 501 to 497 million years ago. It is part of the Upper Cambrian and is defined by four trilobite zones. It overlaps with the ICS-stages Guzhangian, Paibian and the lowest Jiangshanian.[citation needed]
The Dresbachian overlies the Middle Cambrian Albertan series, and is the lowest stage of the Upper Cambrian Croixian series, followed by the Franconian stage. The Dresbachian extinction event, about 502 million years ago, was followed by the Cambrian–Ordovician extinction event about 485.4 million years ago.
The term is derived from the town of Dresbach which is located in southeastern Minnesota on the Mississippi River.
The Dresbachian is defined by four trilobite zones: Cedaria-, Crepicephalus-, Aphelaspis- and Dunderbergia trilobite zones.[citation needed]
The Dresbachian extinction event during the Late Cambrian was the second of two severe extinctions during the first period of the Paleozoic era; the first being the End-Botomian extinction event during the Middle Cambrian. According to data on extinction intensity (see below), both extinction events slashed approximately 40 percent of marine genera. They are poorly documented due to a paucity of fossil evidence so early in the evolution of life.