The Cordilleran ice sheet was a major ice sheet that periodically covered large parts of North America during glacial periods over the last ~2.6 million years. This included the following areas: Western Montana; The Idaho Panhandle; Northern Washington state down to about Olympia and Spokane; All of British Columbia; The southwestern third or so of Yukon Territory

The Long Mynd (Welsh: Cefn Hirfynydd) is a heath and moorland plateau that forms part of the Shropshire Hills in Shropshire, England.The high ground, which is common land and designated as an Area of Outstanding Natural Beauty, lies between the Stiperstones range to the west and the Stretton Hills and Wenlock Edge to the east. Much of it is owned by the National Trust, and …

The Wolstonian Stage is a middle Pleistocene stage of the geological history of Earth from approximately 374,000 until 130,000 years ago. It precedes the Eemian Stage in Europe and follows the Hoxnian Stage in the British Isles.. It is also approximately analogous to the Warthe and Saalian stages in northern Europe; the Riss glaciation in the Alps; and the Illinoian Stage …

The Paleogene (/ ˈ p eɪ l i. ə dʒ iː n,-l i. oʊ-, ˈ p æ l i-/ PAL-ee-ə-jeen, -⁠ee-oh-, PAY-lee-; also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 million years ago to the beginning of the Neogene Period 23.03 Mya. It is the beginning of the …

The Gelasian is an age in the international geologic timescale or a stage in chronostratigraphy, being the earliest or lowest subdivision of the Quaternary Period/System and Pleistocene Epoch/Series. It spans the time between 2.58 Ma (million years ago) and 1.80 Ma. It follows the Piacenzian Stage (part of the Pliocene) and is followed by the Calabrian Stage.

Lithology. The Utica Shale is composed of calcareous, organic, and rich shale.. Oil and gas. The Utica shale is a major source of tight gas in Quebec, and is rapidly becoming so in Ohio.. Quebec. Drilling and producing from the Utica Shale began in 2006 in Quebec, focusing on an area south of the St. Lawrence River between Montreal and Quebec City.Interest has grown in …

The Sturtian glaciation was a glaciation, or perhaps multiple glaciations, during the Cryogenian Period when the Earth experienced repeated large-scale glaciations. The duration of the Sturtian glaciation has been variously defined, with dates ranging from 717 to 643 Ma. Stern et al. place the period at 715 to 680 Ma.. According to Eyles and Young, "Glaciogenic rocks figure …

The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age. Both age and stage bear the same name. As a unit of geologic time …

The Quaternary glaciation, also known as the Pleistocene glaciation, is an alternating series of glacial and interglacial periods during the Quaternary period that began 2.58 Ma (million years ago) and is ongoing. Although geologists describe this entire period up to the present as an "ice age", in popular culture this term usually refers to the most recent glacial period, or to the ...

In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series.It spans the time between 152.1 ± 4 Ma and 145.0 ± 4 Ma (million years ago). It is preceded by the Kimmeridgian and followed by the Berriasian (part of the Cretaceous).

Local extinction, also known as extirpation, refers to a species (or other taxon) of plants or animals that ceases to exist in a chosen geographic area of study, though it still exists elsewhere.Local extinctions are contrasted with global extinctions.. Local extinctions mark a change in the ecology of an area. In recent times, local extinction has sometimes been …

An exoskeleton (from Greek έξω éxō "outer" and σκελετός skeletós "skeleton") is the external skeleton that supports and protects an animal's body, in contrast to the internal skeleton (endoskeleton) of, for example, a human.In usage, some of the larger kinds of exoskeletons are known as "shells".Examples of exoskeletons within animals include the arthropod exoskeleton …

The Farallon Plate was an ancient oceanic plate.It formed one of the three main plates of Panthalassa, alongside the Phoenix Plate and Izanagi Plate, which were connected by a triple junction.The Farallon Plate began subducting under the west coast of the North American Plate—then located in modern Utah—as Pangaea broke apart and after the formation of the …

Stolons may or may not have long internodes.The leaves along the stolon are usually very small, but in a few cases such as Stachys sylvatica are normal in size.. Stolons arise from the base of the plant. In strawberries the base is above the soil surface; in many bulb-forming species and plants with rhizomes, the stolons remain underground and form shoots that rise to the surface …