0. Holtedalil—A TiUite-like Conglomerate. 169 



striae have been observed, but since the sparagmites have 

 suffered much from the Caledonian deformation, the find- 

 ing of striae is very difficult. In fact, when the bowlders 

 are freed from the matrix, their surface is generally seen 

 to be slickensided and tectonically striated. This con- 

 glomerate is exactly like the brown tillites of Finmarken, 

 recently mentioned by me in this Journal. 5 



As there is no break in the sequence below the conglom- 

 erate just described, it can not have been deposited by a 

 glacier on the dry land ; and if we assume a glacial origin, 

 the material must be thought of as having been deposited 

 by floating ice, or, better, as morainic material in front of 

 a submerged glacier. 



Above the tillite-like conglomerate, the thickness of 

 which at Lake Mjosen appears to be at least 10 meters 

 (perhaps considerably thicker), though somewhat less in 

 the eastern district, follows a relatively thin zone of red 

 and green shale, sometimes with sandstone beds, and 

 this in turn is overlaid by the so-called "Quartz sand- 

 stone." As the name indicates, this formation is a nor- 

 mal sandstone, consisting essentially of quartz with the 

 mineral grains smaller, more even-sized and rounded than 

 in the sparagmites ; zones of sparagmite-like rock, how- 

 ever, are also met with here. The color of the quartz 

 sandstone is mostly from bluish to yellowish gray, and 

 the material indicates a longer transport, with better sort- 

 ing and rounding of the grains. In the southwestern part 

 of the sparagmite area this sandstone is very thick, cer- 

 tainly upward of 100 meters. It gradually passes into 

 sandy shale, which in turn passes into greenish shale 

 holding the Holmia fauna which has recently been revised 

 and described by Kiaer. 6 The stratigraphic succession 

 is illustrated in generalized form in fig. 2. 



If we next consider the distribution of the different 

 formations above described, it becomes evident, as has 

 been made especially clear by the author's recent studies 

 along the eastern border of the sparagmite area, that the 

 quartz sandstone in the southern part of the area has a 

 much wider distribution than the older feldspar-bearing 

 zones. Ten kilometers west of the Engerdalen valley the 



5 0. Holtedahl, this Journal (4), 47, 104, 1919. 



c J. Kiaer, The Lower Cambrian Holmia Fauna at Tomten in Norway, 

 Vidensk. selsk. Skr., 1916, Xo. 10. 



