Ordovician Geology

official period of the Paleozoic era by the International Geological Congress. The Ordovician ended with a series of extinction events that, together amount...

Geology is the study of the nonliving things that the Earth is made of. Geology is the study of rocks in the Earth's crust. People who study geology are...

Geologic time scale uses the principles and techniques of geology to work out the geological history of the Earth. It looks at the processes which change...

The Silurian was the period from the end of the Ordovician, about 443.4 million years ago (mya) to the beginning of the Devonian period, about 419 mya...

National Park. The upper part of the mountain mesa (table) consists Silurian/Ordovician quartzitic sandstone, commonly referred to as Table Mountain Sandstone...

the implied behaviour of their makers. Rusophycus trace fossil from the Ordovician of southern Ohio. Scale bar is 10 mm. Skolithos trace fossil. Scale bar...

Frasnian/Famennian junction. 5. End–Ordovician extinction event. After a series of lesser events, the end-Ordovician extinction resulted in an estimated...

strata come in many layers. It is a term in sedimentary and historical geology; the singular is stratum. The study of strata is called stratigraphy. These...

sediments. This in turn is unconformably overlain by a sequence of Cambro–Ordovician sediments. It formed part of the Laurentian foreland during the Caledonian...

orogeny. This was a plate tectonic collision which took place from Mid Ordovician to Mid Devonian periods (520 to 400 million years ago), during the closure...

eroded valleys are cut into Mississippian limestones and below that layer Ordovician dolomites. The Boston Mountains form the southwestern part of the Ozark...

formations of Morocco are Burgess Shale type deposits dating to the Lower Ordovician. In the fossilized fauna were numerous organisms previously thought to...

geology of Great Britain is varied. With its eventful geological history, Great Britain has a variety of landscapes. Rocks of almost all geological ages...

the 19th century. The "Cambrian," (the Roman name for Wales) and the "Ordovician," and "Silurian", named after ancient Welsh tribes, were periods defined...

The Mississippian is the first geological epoch in the Carboniferous geological period. It began about 359 million years ago and ended 323. The names Mississippian...

tardigrades, and Onychophora arose. They are found in the Cambrian, Ordovician (possibly), Silurian, and Pennsylvanian periods. Historically, all fossil...

2011. Retrieved 18 June 2010. Stampfli, Gérard. "Prototethys (Ordovician): Early Ordovician (490 Ma) reconstruction". Archived from the original on 18 January...

(1996). "New evidence for land plants from the lower Middle Ordovician of Saudi Arabia". Geology. 24 (1): 55–59. Bibcode:1996Geo....24...55S. doi:10...

485.4 million years ago. Before it came the Ediacaran, and after it the Ordovician. Biologists have learnt quite a lot about the soft parts of Cambrian animals...

northern Europe and the eastern United States. The events occurred from the Ordovician to early Devonian, roughly 490–390 million years ago (mya). It was caused...