60 ANNALS NEW YORK AUADI^JMY OF t'lCJPJiXCES 



Feet Inches 



Argillaceous limestone, finely laminated 8 



Yellow shale 4 



Sandstone containing agate either in concretionary 

 masses half an inch or more in diameter or dissemi- 

 nated generally throughout the mass 1 



Sandstone, easily crumbling ; made up of thin layers ... S 



Massive sandstone, poorly indurated 2 



Fine paper-shale 2 



Massive sandstone, poorly indurated 7 



Gypsum interstratified with layers of clay 12 to 20 



Red sandstone (Red Beds) 



E. C. Hills (1900, 7) describes the Morrison of the Walsenberg qnad- 

 Tangle as follows : 



"Morrison formation. — This formation aggregates about 270 feet in 

 thickness at the southern extremity of the Greenhorn Mountains, where 

 there is a narrow outcrop extending along the foothills a distance of 

 about 5 miles and passing on beyond the west boundary of the quadrangle. 

 It is also exposed along the canyons of the Cuchara and Huerfano for a 

 distance of over 20 miles. About midway between the extremities of the 

 Greenhorn Mountains outcrop the inclination varies from 45° to nearly 

 vertical. The lower portion consists of about 60 feet of soft, white sand- 

 stone having a conglomerate layer at the base. This is followed by hard, 

 shaly beds of pinkish and greenish tints, breaking into fragments with 

 conchoidal fracture. The upper portion consists of variegated shales and 

 clays alternating with bands of hard, fine-grained limestone, often con- 

 taining vermilion-colored cherts. One band of conglomerates a few feet 

 thick contains green pebbles. At one point the basal sandstone overlaps 

 the Badito formation, and rests on the Archean at an angle of 15°. In 

 the canyons of the Huerfano and Cuchara the strata have but slight in- 

 clination except where an upward bulge brings an area of the Fountain 

 to the surface. Here the thickness of the Morrison is less than 100 feet, 

 and corresponds to the upper, variegated part of the Greenhorn outcrop, 

 the lower part being entirely wanting. There is still considerable doubt 

 as to the true position of this formation in the time scale, and the assign- 

 ment to the Jura-trias is therefore provisional." 



In the Apishapa quadrangle the Morrison consists of blocky clay or 

 argillite, according to Stose (1912, 7), with thin beds of limestone and 

 ;Some soft sandstone. The argillites are of brilliant colors, ranging from 

 white to dark brown or red, and to green and drab. Only 120 feet of the 

 formation is exposed in the quadrangle. Stose gives the following com- 

 posite section of the upper part of the Morrison in Huerfano Canyon : 



