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Araucarioxylon arizonicum (alternatively Agathoxylon arizonicum) is an extinct species of conifer that is the state fossil of Arizona. [1] The species is known from massive tree trunks that weather out of the Chinle Formation in desert badlands of northern Arizona and adjacent New Mexico, most notably in the 378.51 square kilometres (93,530 acres) Petrified Forest National Park. [2]
Foliage (dark green) and fruit (light green) of a mature specimen. In Arizona, the range of Fraxinus velutina is centered on the Mogollon Rim, from the northwest in the Grand Canyon feeder canyons of southern Utah and Nevada, to the central-east White Mountains (Arizona) merging into the same mountainous area of western New Mexico, then to the Rio Grande valley south to trans-Pecos Texas.
[2] [1] The remaining material is nearly pure silica, with only iron, aluminum, and alkali and alkaline earth elements present in more than trace amounts. Iron, calcium, aluminum are the most common, and one or more of these elements may make up more than 1% of the composition. [2] Just what form the silica initially takes is still a topic of ...
European ash in flower Narrow-leafed ash (Fraxinus angustifolia) shoot with leaves. Fraxinus (/ ˈ f r æ k s ɪ n ə s /), commonly called ash, is a genus of plants in the olive and lilac family, Oleaceae, [4] and comprises 45–65 species of usually medium-to-large trees, most of which are deciduous trees, although some subtropical species are evergreen trees.
The major Grenville orogeny in the east of the Proto-North American continent impacted areas as far west as Arizona, producing large rift basins between 1.2 and 1 billion years ago. Rift basins were structurally related to the formation of copper deposits and the Keweenawan basalt flaws in Michigan, and regionally, the basins filled with thick ...
Green’s mountain ash (S. scopulina) is native to the mountains from Alaska to California, and east to the Rocky Mountains and Northern Great Plains. It grows as a multi-stemmed shrub that is ...
Arbutus arizonica, commonly known as Arizona madrone, is a tree species in the heath family that is native to the southwestern United States and northwestern Mexico. Its range extends along the Sierra Madre Occidental cordillera from the Madrean Sky Islands of southeastern Arizona and southwestern New Mexico [ 3 ] south as far as Jalisco .
Dutch elm disease killed only 200 million elm trees while EAB threatens 7.5 billion ash trees in the United States. The insect threatens the entire North American genus Fraxinus . Since its introduction into the United States and Canada in the 1990s, and its subsequent detection in Detroit, Michigan , in 2002, it has spread to eleven states and ...