106 ANNAL8 NEW YORK ACADEMY OF SCIENCES 



Feet 

 7. Dark blue wormy looking limestone greatly resembling typical bird's- 

 eye limestone of the east 85 



6. Thin-bedded brown shale, strongly jointed toward the top 60 



5. Finely intercalated lime and shale 10 



4. Light blue streaky limestone, weathers white 15 



3. Blue heavy bedded limestone with wormy appearance toward top 60 



2, Brown shale, blocky appearance from extreme jointing 75 



1. Blue limestone intercalated with seams of clay giving a banded ap- 

 pearance 30 



Total 481 



Subformation : Alta shale 200 



1^0 fossils were found in the beds of the above section, bnt the ramify- 

 ing tubes in the "wormy" looking members are very suggestive of some 

 form of life. Placed side by side, it is difficult to detect any appreciable 

 difference between the specimens of the Ordovician Bird^s-eye (Lowville) 

 limestone of New York and those taken from this section. Within this 

 part of the Wasatch, this character is a constant one and is a striking fea- 

 ture by which the rocks of this horizon can always be told. Though it has 

 afforded no fossils within the area studied, it is interesting as representing 

 the first limestone making period of this region. No coarse elastics occur, 

 and the series belongs essentially to the off-shore facies, where conditions 

 of sedimentation were constant for considerable lengths of time, but on 

 the whole subject to quite frequent change. The period is brought to a 

 close by a withdrawal of the sea and exposure of the surface to erosion. 

 The limestones of this new land area were broken up and worn round, 

 t3rpically lens-shaped, and deposited in a curious helter-skelter fashion 

 with many of the flat pebbles standing on edge. Hand specimens taken 

 are almost identical in appearance with those described and illustrated by 

 Blackwelder^^ from China. Intra-formational conglomerates from the 

 Lower Ordovician have also been reported from Pennsylvania.^^ In the 

 Lakeside Mountains, west of Great Salt Lake, there is a bed of similar 

 limestone conglomerate of considerable thickness belonging to the Beek- 

 mantown horizon. While the age of the beds below the "edgewise" con- 

 glomerate of the above section cannot be told definitely because no fossils 

 were found in them, they are referred provisionally to the Ordovician. 

 They are of special interest because the largest ore deposits of the region 

 have been found in them. The rich galena bedded vein of the Maxfield 



15 E. Blackwelder : Research in China, Vol. 1, Part 2, pp. 384-390. 

 " G. W. Stose : U. S. Geol. Surv. Folio 170. 1910. 

 T. C. Brown : "Notes on the Origin of Certain Paleozoic Sediments," etc., Joui-. of 

 Geol., Vol. XXI, pp. 232-250. 1913. 



