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Later plants from the Permian period did as well. [2] A "great diversity" of plants composed the Permian flora of Arizona. They left fossils in the area now occupied by many of the trails leading down into the Grand Canyon. [3] Rutiodon. With the start of the Mesozoic era, geologic forces elevated the topography of the state's southwestern ...
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]
Small, primitive maize cobs have been found at five different sites in New Mexico and Arizona. These sites encompass a wide climatic range, from the Tucson basin in the Arizona desert, at an elevation of 700 m (2300 ft), to a rocky cave on the Colorado Plateau at 2200 m (7200 ft). This variation suggests that the primitive maize grown in these ...
Jack mackerel caught by a Chilean purse seiner Fishing down the food web. Overfishing is the removal of a species of fish (i.e. fishing) from a body of water at a rate greater than that the species can replenish its population naturally (i.e. the overexploitation of the fishery's existing fish stock), resulting in the species becoming increasingly underpopulated in that area.
The Sonoran Desert near Tucson, Arizona during winter. Many plants not only survive, but thrive in the harsh conditions of the Sonoran Desert. Many have evolved specialized adaptations to the desert climate. The Sonoran Desert's bi-seasonal rainfall pattern results in more plant species than any other desert in the world. [2]
Last year, when Phoenix endured its hottest summer in recorded history — with a record 31 straight days of temperatures at or above 110 F — stark images emerged of saguaro cacti that had ...
In 1895, J. A. Allen described a mammal collection from southeastern Arizona, "On the headwaters of the San Pedro, in Sonora, a colony of a dozen or more had their lodges up to 1893, when a trapper nearly exterminated them. All the streams in the White Mountains have beaver dams in them, although most of the animals have been trapped."
Almost 12 years ago, a pilot flying a small plane over the desert in Arizona spotted something she would never forget. Pez Owen told NPR that when she noticed white crosses on the ground, she and ...