191 I. N^O. 7- A NEW DOWNTONIAN FAUNA OF THE KRISTIANIA AREA. 1 1 



east we find layers of blue-gray limestone alternating with gray-green 

 marly shale. These belong to the uppermost marine Ludlow zone {9 g). 

 and contain characteristic fossils e. g. RlitptchoncUa unculd Sow, Spirifer 

 elerafus Dalm; Betjridiia sp., Leperditia Xoyvef/ica Kiær, and a 

 branched Monticalipora. These beds are separated from the red shales 

 and sandstones farther to the west by a fault. The direct transition 

 cannot be seen here. The fault is not a very large one, and I am inclined 

 to believe that scarcely more than 15—20 m. of the series are covered 

 by it. On the west side of the fault, according to this presumption, we 

 should come 10—15 m. up in the lower part of the sandstone series. 



The strike of the beds is about N. 85°— 90° 0. and the dip 10 — 

 12° South. 



The following strata are to be seen here: 



1. Lowest, uniform or schistose red-brown sandstone alternating 

 with somewhat thin layers of shale of the same colour, to a depth of 

 about 4 m. The sandstone is as usual slightly calcareous and micaceous. 

 In the horizons of shale we generally find thin plates of brown-red 

 calcareous sandstone, which in the uppermost of these horizons some- 

 times show trails of Eurypterids. Mcrostoniidinitcs sp. This horizon 

 may be named the lower horizon with trails. 



2. A thick bed of brown or slightly-red uniform calcareous sand- 

 stone, often rich in shah' spots, about 1.3 m. 



3. At first a thin layer of gray-green shaly sandstone, and later 

 on a thicker bed of sandstone of the same colour in all about 0.25 m. 

 Both beds contain slight quantities of copper and also badly preserved 

 fragments of Dicfi/ocaris, Cerati()ca)is. and Kiunpterus sp. Fragments 

 of Dictyocnris are especially abundant in the upper sandstone bed. I 

 have named this lower horizon with Phi/llocdrids and Ki<ri/j)fcri(h, the 

 D'ktjiocaris -horizon. 



4. Reddish-brown shale with .some {qw beds of reddish sandstone, 

 and some thin layers of gray-green shale, about 3 m. 



5. Beds of varying thickness of gray-green calcareous sand-stone, 

 about 1.2 m. 



6. Gray-green calcareous and argillaceous sandstone, which can be 

 easily split into somewhat thin, and irregular slabs 27 — 30 cm. This 

 gray-green band is succeeded in an upward direction by similar beds with 

 a red-brown colour, about 14—15 cm. in thickness. These strata, 

 which in all measure 42— 45 cm., form the rich fossil i ferous 

 horizon at Rudstangen from which, especiallx' in the gray green 

 beds, I have collected a great deal of material, remains of crustaceans 



