

WILLIAMS.] KING. 219 



1,200 or 1,400 feet belong to the Devonian, having fossils of the Upper 

 ] Ieklerberg and Chemung groups. The fossils obtained from the Upper 

 Helderberg horizon are mentioned, and those also from the upper mem- 

 bers of the Devonian. The Genesee and Chemung faunas of the Wah- 

 satch limestone are followed by beds whose forms closely resemble 

 those of the Waverly group, but Messrs. Hall and Whitfield considered 

 them Upper Devonian. A gap of barren limestones occurs between the 

 Waverly and this fossiliferous zone, so that the thickness of the Wa- 

 verly is not definitely known, but in the Oquirrh Eange the combined 

 thickness of the Waverly and Subcarboniferous can not be less than 

 1,000 feet. The remaining 4,000 feet of the W T ahsatch limestone con- 

 tain at intervals beds with distinct Coal Measure forms. The Wah- 

 satch limestone, therefore, represents 4,000 to 4,500 feet of Coal Meas- 

 ures, 1,000 to 1,200 feet of Subcarboniferous and Waverly [Mississip- 

 pianj, and 1,000 to 1,400 feet of Devonian. 



Above the Wasatch limestone is found a bed of siliceous material 

 called the " Weber quartzite," from its typical exposure in the Weber 

 Canon. It is about 0,000 feet in thickness, with a few red sandstones 

 at the base, occasional limited fine beds of shale interspersed at three 

 or four different horizons, and varied by thin sheets of conglomerate 

 and rounded quartz pebbles. It is referred to the middle Coal Meas- 

 ures, though no fossils are found in it in this locality. Six thousand 

 feet is its minimum thickness; it reaches 9,000 to 10,000 feet in the 

 Oquirrh. The great terrane of sandstones, with intercalated shales 

 and conglomerates, forming the body of the Uinta .Range, is referred 

 to this member of the series. 



Overlying it is a terrane of about 2,000 to 2,500 feet of limestones, 

 chert beds, calcareous and argillaceous shales, and beds of calcareous 

 sandstones and arenaceous limestones, a very variable series, and 

 throughout carrying Coal Measure forms ; and above this is another 

 variable terrane of argillaceous and calcareous shales and mud rocks, 

 with limited beds of limestone anjl sandstone, containing many ripple 

 marks. It contains forms referred by Meek and Hall and Whitfield to 

 the Permo-Carboniferous. Its maximum thickness is 500 feet. 



11 Aside from the intimation of a local shallowing at the close of the 

 Wahsatch limestone in western Nevada, the evidences are all of deep- 

 water deposits till near the close of the Upper Coal Measure series, 

 when ripple-marked shales make their appearance, and the Permian 

 depositions thereafter seem all to be of a shoal- water character." 1 



In the year 1878 Mr. Clarence King's 2 first volume of the U. S. Geo- 

 logical Exploration of the Fortieth Parallel was published. 



1 The details of this series of correlations is given in Volumes I, II, and IV of the reports of the 

 "United States Geological Exploration of the 40th parallel, Clarence King, Geologist in charge, Wash- 

 ington, 1877 and 1878." 



Vol. I. Systematic Geology, by Clarence King. 



Vol. II. Descriptive Geology, by Arnold Hague and S. F. Emmons. 



Vol. IV. Part I, Paleontology, by F.B.Meek; Part II, Paleontology, by James Hall and R. P. Whit- 

 field. 



8 "Systematic Geology," by Clarence King, U. S. Geologist, Washington, 1878. 



