Similar ruins to those of Casas Grandes exist near the Gila, the Salinas, and the Colorado and it is probable that they are all the erections of one people.
His chief work is his Istorie della Gila di Firenze, covering the period from 1498 to 1538, in part based on Biagio Buonaccorsi's Diario.
The Gila Monster (Heloderma suspectum), a poisonous lizard, whose bite is injurious but rarely, if ever, fatal to man, also occurs in the desert regions.
Suspectum, the gila monster, in the hot and sandy lowlands of the Gila basin.
Below the mouth of the Gila river, thence northward to the mouth of the Gila, and thence, nearly due W., along the old line between Upper and Lower California to a point on the Pacific coast one marine league S.
But he had not gone far when he was led astray by a guide, and after the loss of his entire outfit and several of his men, and intense suffering of the survivors from cold and hunger, he turned southward through the valley of the Rio Grande and then westward through the valley of the Gila into southern California.
The Colorado desert (together with the lower Gila Valley of Arizona) is the hottest part of the United States.
'1 of the Gila river and W.
The eastern border of this area is formed by the valley of the Rio Grande and the western foot-hills of the Rocky Mountains; the southern boundary overlooks the Gila river; and on the N.
The westward-flowing streams - the San Juan, Rio Puerco of the West, Zuni, Rio San Francisco and Gila - are of only slight importance, though their flow is perennial.
Among the venomous reptiles and insects are the rattlesnake, the Gila monster (Heloderma suspectum), a poisonous lizard, and the tarantula (Mygale Heintzii), which, however, are common only in certain places and at certain seasons.
Below its junction with the Gila, and thence up the middle of the Colorado river to the boundary line between Mexico and California.
Parts the waters of the Gila and the Little Colorado, it often has an elevation of 1000 to 2000 ft., and the ascent is impracticable through long distances to the most daring climber.
Mountain snows feed the Gila, the Little Colorado, and the Colorado rivers.
The Colorado, apart from the Gila, draws little water from Arizona.
Into the Gila; and the latter is by far the heavier drainage in volume.
Even the Gila is dry in its bed part of the year at its mouth near Yuma.
From the Gila to the southern boundary the parched land gives no water to the sea, and the international boundary runs in part through a true desert.
Of the mountains it ranges from temperate heats in the foothills to semi-tropic heat in the lower valleys of the Gila and Colorado.
The warmest region is the lower Gila valley.
The Gila-monster, tarantula, the scorpion and thelyphonus, scolopender and julus occur in some localities in the rainy season.
Another important undertaking begun about the same time was the throwing of an East Indian weir dam (the only one in the United States) across the Colorado near Yuma, and the confinement of both sides of the lower Gila and Colorado with levees.
The second half of the 19th century witnessed several great finds; first, of gold placers on the lower Gila and Colorado (1858-1869); later, of lodes at Tombstone, which flourished from 1879-1886, then decayed, but in 1905 had again become the centre of important mining interests; and still later the development of copper mines at Jerome and around Bisbee.
Low-grade coal deposits occur in the east central part of the state and near the junction of the Gila and San Pedro rivers.
Pueblo ruins are plentiful in the basins of the Gila and Colorado rivers and their tributaries.
The pueblos of the Gila valley are held to be older than those of the Colorado.
Arizona north of the Gila, save for a very limited and intermittent missionary effort and for scant exploring expeditions, was practically unknown to the, whites until well after the beginning of American rule.
The region south of the Gila had already been repeatedly explored.
As a result of the Mexican War, New Mexico, which then included all Arizona north of the Gila, was ceded to the United States.
California gold discoveries drew particular attention to the country south of the Gila, which was wanted also for a transcontinental railway route.