290 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



lae, small nodules, and occasionally a thin, regular 



layer. Some of the thick layers contain so much 

 dark-weathering chert that they give a dark rusty 

 brown color to cliffs. The purer gray limestone lamel- 

 lae thicken in places so that layers several feet in 

 thickness occur without cherty inclusions ,. . . 175 53.3 



2b. Limestones concealed by talus slope but exposed a mile 



(1.6 km.) south 60 18.3 



Limestone at base similar to 40 8 2.4 



3c. Fine-grained, smooth, dove-colored limestone in thin, 

 even layers from 2 to 4 inches (5.1 to 10.2 cm.) 

 thick 14 4.3 



Sd. Similar to 3a 48 14.6 



Total of3 305 92.9 



Fauna. — At 35 feet (10.7 m.) below summit of sa, a thin 

 layer of gray limestone yielded fragments of trilobites. 

 (69d) same as (69a). 



A thin layer of bluish-gray limestone at no feet 

 (33-5 m-) below summit gave a few imperfect frag- 

 ments and a similar layer 140 feet (42.7 m.) below the 

 summit gave (69a) a Mcgalaspis fauna. 



In central portion of 2>d occurs a small faunule, 

 the same as (69a), (69e). 



4. Steel-gray magnesian limestone in layers 2 to 4 feet 

 (.6 to 1.2 m.) thick, and weathering yellowish buff in 

 color 1 10 33.6 



Total thickness of Sarbach formation 910 277.3 



The line between the Sarbach and the subjacent 

 bluish-gray and dirty gray-weathering light gray lime- 

 stones of the subjacent Mons formation is strongly 

 marked by the contrast in color and character of the 

 limestones, and the Ozarkispira fauna of the upper 

 Mons is not known in the Sarbach. 



The above section of the Sarbach is the best that 

 I have encountered. It is most accessible, and there 

 is a fine camp site to the north side of Fossil Moun- 

 tain at the foot of Skoki Mountain, which is 10 miles 

 (16.1 km.) by trail from Lake Louise Station. 



OZARKIAN ♦ 



Mons Formation 



I. Bluish-gray and dirty gray-weathering light gray lime- 

 stones in layers 2 to 4 feet (.6 to 1.2 ni.) thick, 

 with a little chert in small fragments and as replace- 

 ment of fragmentary fossils. Measured 150 feet 

 (45.7 m.) to foot of debris and dirt slope. Small out- 



