CAMBRIAN CORDILLERAX SECTION'S WALCOTT I73 



HOUSE RANGE SECTION 



In order to locate the various points referred to, the accompanying 

 map has been prepared, under the direction of Mr. L. D. Burling, 

 from a manuscript topographic map made by Mr. W. D. Johnson of 

 the U. S. Geological Survey (see plate 13). 



Locality. — West and east of Antelope Springs and east-southeast 

 and south of ]\Iarjum Pass, House Range, Millard County, Utah. 

 Sawtooth Range is a name given locally to the House Range south 

 of jVIarjum Pass. 



The section begins at the top, 285 feet below the summit of Notch 

 Peak, the highest point (8,828 feet) on the House Range south of 

 Marjum Pass. 



The top of the peak is formed of 285 feet of Ordovician lime- 

 stone, which is a banded, thin-bedded, bluish gray and purplish lime- 

 stone containing near the top a distinct fauna : 



Obolns (Westonia) notchensis Walcott [iqoBc/, p. 69]. 

 Boorthis coloradoensis (Meek) [1870, p. 425]. 

 Raphistoma sp., etc. 



The strike of the upper beds is north 20° east (magnetic) ; dip, 

 12° south. 



The line of the section extends down the northeast slope of Notch 

 Peak and thence to a high ridge east of the area of eruptive granite 

 on the northwest slope of Notch Peak; thence north to Marjum 

 Pass. It is then carried on the line of the upper beds of the 

 \Mieeler formation to a point southeast of Antelope Springs ; thence 

 west to Dome Pass and (on the north side of Dome Canyon) to the 

 Lower Cambrian quartzitic sandstones that pass beneath the quater- 

 nar}- of the White A^'alley at the western foot of the House Range. 



ORDOVICIAN 



Feet 



Limestone resting conformably on the Cambrian 285 



UPPER CAMBRIAN 



NOTCH PEAK FORMATION: 



The Notch Peak formation [Walcott, 1908a, p. 9] is exposed on the east and 

 southeast slopes and ridges of Notch Peak. Feei 



10. Gray, arenaceous limestone in thick layers and bands of thin 

 layers. Irregular nodules and thin layers of dark gray chert, 

 weathering dark brown, occur at irregular intervals for 350 

 feet below the summit. Thin, cherty layers, one-half to one- 

 eighth inch thick, also occur occasionally below 640 



