La terre de soleil ; un manuel de ressources, les produits, les secteurs et le climat du Nouveau-mexique . bly couvrent plus de la moitié de l'ensemble de la zone. Les deux haut et bas^cretaceoussediments er sont bien représentés. Dans les Pecos et les vallées, en particulier autour de thewestern et frontières nord de la Llano Estacado, therelies au-dessus des lits rouge une remarquable séquence de roches calcaires et de sables, d'argiles. Ils ont été appelé le Trinitysands à la base, le hmestone theWashita Fredericksburg, et des sables bitumineux. À la base du crétacé supérieur est un grès épais au moins 300 pieds d'épaisseur

• Contributeur: The Reading Room / Alamy Banque D'Images
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The land of sunshine; a handbook of the resources, products, industries and climate of New Mexico . bly cover more than one-half of the whole area. Both the upper and low^er cretaceoussediments are well represented. In the Canadian and Pecos Valleys, particularly around thewestern and northern borders of the Llano Estacado, therelies above the red beds a remarkable sequence of sands, chalky rocks and clays. These have been called the Trinitysands at the base, the Fredericksburg hmestone, and theWashita sands. At the base of the upper cretaceous is a thick sandstone atleast 300 feet in thickness. This is one of the chief artesianwell reservoirs. In northeastern New Mexico particularly, the Coloradoformation is well defined. It there attains a thickness offully 800 feet. It comprises chiefly shales with numerousbands of hmestone and several thick sandstones. Attaining a development of 1, 500 feet in northeastern NewMexico, the Montana is well represented by at least two im-portant terranes, known further north as the Pierre shalesand the Fox Hills sandstones. The shales are prevailingly. THE LAND OF SUNSHINE. 35 gray and drab, becoming j^ellowish above and blackish below. Here the beds generally referred to the Laramie are upwardof 2, 000 feet in thickness. The rocks are chietl}^ gray sand-stones and shales, with numerous beds of coal. Most of thecoal of the region is believed to belong to the Laramie age.The coals of the Raton, Dawson, Cerrillos, Carthage and theBear mountains are all regarded as Laramie coals. In northeastern New Mexico and in the Rio Grande Valleythere are two large areas of gray shales which reach a maxi-mum thickness of over 800 feet. They have been referred tothe early Tertiary, and are called the Puerco series. The later Tertiary beds are widely distributed. The LlanoEstacado formation of eastern New Mexico, over 800 feet inthickness, appears to belong to this age. On Galisteo creek, south of Santa Fe, certain sands are referred to the Neocene, as a

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